Analisis Pengaruh Waktu pada Proses Karburasi Terhadap Kekerasan dan Mikrostruktur Baja Karbon Menengah NS-1045
LAMPIRAN 1
HASIL PERHITUNGAN DATA PENGUJIAN BAHAN
= 1,8544
1.1 Kekerasan
Quenching
Sebelum
VHN =
Proses
= 1,8544
VHN2 = 159,860 kgf/mm2
VHN3 = 1,8544
= 1,8544
Bahan
Original
perlakuan )
(Tanpa
VHN3 = 159,860 kgf/mm2
VHN1 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN1 = 201,564 kgf/mm2
VHN4 = 159,860 kgf/mm2
VHN2 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN2 = 174,942 kgf/mm2
VHN5 = 159,860 kgf/mm2
VHN3 = 1,8544
VHN6 = 1,8544
= 1,8544
= 1,8544
VHN3 = 187,313 kgf/mm2
VHN6 = 159,860 kgf/mm2
VHN7 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN7 = 149,548 kgf/mm2
2
VHN4 = 180,038 kgf/mm
VHN = 185,964 kgf/mm2
VHN8 = 1,8544
= 1,8544
Karburasi selama 2 jam
VHN8 = 146,015 kgf/mm2
VHN1 = 1,8544
= 1,8544
VHN1 = 206,044 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 159,860 kgf/mm2
VHN2 = 1,8544
VHN10 = 1,8544
Universitas Sumatera Utara
= 1,8544
VHN7 = 1,8544
VHN10 = 168,581 kgf/mm2
= 1,8544
VHN7 = 170,128 kgf/mm2
VHN = 162,934 kgf/mm2
VHN8 = 1,8544
Karburasi 4 Jam
= 1,8544
VHN1 = 1,8544
VHN8 = 178,306 kgf/mm2
= 1,8544
VHN1 = 185,440 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 159,860 kgf/mm2
VHN2 = 1,8544
= 1,8544
VHN2 = 173,306 kgf/mm2
VHN10 = 1,8544
= 1,8544
VHN10 = 158,495 kgf/mm2
VHN3 = 1,8544
= 1,8544
VHN = 164,703 kgf/mm2
VHN3 = 155,830 kgf/mm2
Karburasi 6 Jam
VHN4 = 1,8544
VHN1 = 1,8544
= 1,8544
VHN4 = 147,174 kgf/mm2
= 1,8544
VHN1 = 164,105 kgf/mm2
VHN5 = 1,8544
VHN2 = 1,8544
= 1,8544
VHN5 = 162,666 kgf/mm2
= 1,8544
VHN2 = 178,306 kgf/mm2
VHN6 = 1,8544
= 1,8544
VHN3 = 1,8544
2
VHN6 = 155,830 kgf/mm
= 1,8544
VHN3 = 170,128 kgf/mm2
Universitas Sumatera Utara
Karburasi 8 Jam
VHN4 = 1,8544
VHN1 = 1,8544
= 1,8544
= 1,8544
VHN4 = 174,942 kgf/mm2
VHN1 = 180,038 kgf/mm2
VHN5 = 1,8544
VHN2 = 1,8544
= 1,8544
= 1,8544
VHN5 = 181,803 kgf/mm2
VHN2 = 178,306 kgf/mm2
VHN6 = 1,8544
VHN3 = 1,8544
= 1,8544
= 1,8544
VHN6 = 167,062 kgf/mm2
VHN3 = 174,942 kgf/mm2
VHN7 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN7 = 168,581 kgf/mm2
VHN4 = 171,702 kgf/mm2
VHN8 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN8 = 178,306 kgf/mm2
VHN5 = 170,128 kgf/mm2
VHN9 = 1,8544
VHN6 = 1,8544
= 1,8544
= 1,8544
VHN9 = 181,803 kgf/mm2
VHN6 = 162,666 kgf/mm2
VHN10 = 1,8544
VHN7 = 1,8544
= 1,8544
= 1,8544
VHN10 = 180,308 kgf/mm2
VHN7 = 161,251 kgf/mm2
VHN = 174,534 kgf/mm2
VHN8 = 1,8544
= 1,8544
Universitas Sumatera Utara
VHN8 = 165,570 kgf/mm2
VHN4 = 1,8544
VHN9 = 1,8544
= 1,8544
= 1,8544
VHN4 = 180,038 kgf/mm2
VHN9 = 165,570 kgf/mm2
VHN = 185,964 kgf/mm2
VHN10 = 1,8544
Karburasi selama 2 jam
= 1,8544
VHN1 = 1,8544
2
VHN10 = 193,165 kgf/mm
= 1,8544
VHN1 = 240,831 kgf/mm2
VHN = 174,665 kgf/mm2
VHN2 = 1,8544
1.2
Kekerasan Sesudah Proses
Quenching menggunakan oli
= 1,8544
VHN2 = 243,999 kgf/mm2
VHN =
= 1,8544
VHN3 = 1,8544
= 1,8544
Bahan
Original
perlakuan )
(Tanpa
VHN3 = 247,252 kgf/mm2
VHN4 = 1,8544
VHN1 = 1,8544
= 1,8544
VHN4 = 247,252 kgf/mm2
= 1,8544
VHN1 = 201,564 kgf/mm2
VHN2 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN2 = 174,942 kgf/mm2
VHN3 = 1,8544
VHN5 = 228,936 kgf/mm2
VHN6 = 1,8544
= 1,8544
= 1,8544
2
VHN3 = 187,313 kgf/mm
Universitas Sumatera Utara
VHN6 = 226,145 kgf/mm2
VHN7 = 1,8544
= 1,8544
VHN7 = 247,252 kgf/mm2
VHN8 = 1,8544
= 1,8544
VHN8 = 247,252 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 226,145 kgf/mm2
VHN4 = 1,8544
= 1,8544
VHN4 = 237,743 kgf/mm2
VHN5 = 1,8544
= 1,8544
VHN5 = 226,145 kgf/mm2
VHN6 = 1,8544
= 1,8544
VHN6 = 228,936 kgf/mm2
VHN7 = 1,8544
= 1,8544
VHN10 = 1,8544
VHN7 = 237,743 kgf/mm2
= 1,8544
VHN10 = 228,936 kgf/mm2
VHN = 238,400 kgf/mm2
Karburasi 4 Jam
VHN8 = 1,8544
= 1,8544
VHN8 = 231,800 kgf/mm2
VHN1 = 1,8544
= 1,8544
VHN1 = 349,886 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 223,419 kgf/mm2
VHN2 = 1,8544
= 1,8544
VHN2 = 272,704 kgf/mm2
VHN10 = 1,8544
= 1,8544
VHN10 = 240,830 kgf/mm2
VHN3 = 1,8544
= 1,8544
VHN3 = 254,026 kgf/mm2
VHN = 250,323 kgf/mm2
Karburasi 6 Jam
VHN1 = 1,8544
Universitas Sumatera Utara
= 1,8544
VHN1 = 280,969 kgf/mm2
= 1,8544
VHN9 = 237,743 kgf/mm2
VHN2 = 1,8544
= 1,8544
VHN2 = 264,914 kgf/mm2
VHN10 = 1,8544
= 1,8544
VHN10 = 228,938 kgf/mm2
VHN3 = 1,8544
VHN = 252,923 kgf/mm2
= 1,8544
VHN3 = 264,914 kgf/mm2
Karburasi 8 Jam
VHN1 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN1 = 325,332 kgf/mm2
VHN4 = 264,914 kgf/mm2
VHN2 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN2 = 264,914 kgf/mm2
VHN5 = 243,999 kgf/mm2
VHN6 = 1,8544
VHN3 = 1,8544
= 1,8544
= 1,8544
VHN6 = 261,183 kgf/mm2
VHN3 = 268,752 kgf/mm2
VHN7 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN7 = 240,831 kgf/mm2
VHN4 = 261,182 kgf/mm2
VHN8 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN8 = 240,831 kgf/mm2
VHN5 = 257,553 kgf/mm2
VHN9 = 1,8544
VHN6 = 1,8544
Universitas Sumatera Utara
b. Karburasi 4 Jam
= 1,8544
VHN6 = 257,553 kgf/mm2
x100%
HV=
=
VHN7 = 1,8544
=
= 1,8544
x100%
x100%
= 51,911%
2
VHN7 = 237,743 kgf/mm
c. Karburasi 6 jam
HV=
VHN8 = 1,8544
x100%
=
= 1,8544
=
VHN8 = 231,800 kgf/mm2
x100%
x100%
= 44,913%
VHN9 = 1,8544
d. Karburasi 8 Jam
= 1,8544
x100%
HV=
2
VHN9 = 231,800 kgf/mm
=
=
VHN10 = 1,8544
x100%
x100%
= 47,048%
= 1,8544
VHN10 = 231,800 kgf/mm2
VHN = 256,842 kgf/mm2
1.3 Perhitungan persentase
peningkatan kekerasan sesudah
proses quenching
Maka
besarnya
persentase
peningkatan kekerasan baja karbon
menengah
NS-1045
setelah
dilakukan proses Quenching dengan
Oli Mesran SAE 40 adalah :
HV =
HV = 47,547%
x100%
HV=
a. Karburasi 2 Jam
x100%
HV=
=
=
x100%
x100%
= 46,317%
Universitas Sumatera Utara
Universitas Sumatera Utara
Tabel 1.1. Hasil Uji Kekerasan Permukaan Baja Karbon Menengah
Sebelum Proses Quenching
Diameter Bahan Uji (d) = 16 mm
Tinggi Bahan Uji (h)
= 20 mm
Suhu pemanasan (T)
= 950oC
Beban (F)
= 10 kgf
No
1
2
3
Bahan
Original
2 Jam
4 Jam
Kode
Sampel
A
B
C
Diagonal identitas
Kekerasan Vickers
(HV)kgf/mm2
D=
Hasil
(a+b)/2
kekerasan
0,300
0,304
201,564
0,327
0,327
0,327
174,942
0,313
0,320
0,316
187,313
0,321
0,321
0,321
180,038
0,301
0,301
0,301
206,044
0,341
0,341
0,341
159,860
0,342
0,342
0,342
159,860
0,342
0,342
0,342
159,860
0,342
0,342
0,342
159,860
0,342
0,342
0,342
159.860
0,353
0,353
0,353
149,548
0,376
0,339
0,357
146,015
0,342
0,342
0,342
159,860
0,335
0,329
0,332
168,581
0,317
0,317
0,317
185,440
0,328
0,328
0,328
173,306
0,345
0,345
0,345
155,830
0,355
0,355
0,355
147,174
0,338
0,338
0,338
162,666
0,345
0,345
0,345
155,830
a(mm)
b(mm)
0,308
Rata-rata
185,964
162,934
164,703
Universitas Sumatera Utara
4
5
6 Jam
8 Jam
D
E
0,331
0,331
0,331
170,128
0,324
0,324
0,324
178,306
0,341
0,341
0,341
159,860
0,343
0,343
0,343
158,495
0,337
0,337
0.337
164,105
0,329
0,320
0,324
178,306
0,334
0,328
0,331
170,128
0,329
0,326
0,327
174,942
0,336
0,304
0,320
181,803
0,337
0,332
0,334
167,062
0,332
0,332
0,332
168,581
0,329
0,318
0,323
178,306
0,320
0,320
0,320
181,803
0,323
0,322
0,322
180,308
0,321
0,321
0,321
180,038
0,323
0,323
0,323
178,306
0,327
0,327
0,327
174,942
0,329
0,329
0,329
171,702
0,330
0,330
0,330
170,128
0,338
0,338
0,338
162,666
0,340
0,340
0,340
161,251
0,335
0,335
0,335
165,570
0,316
0,316
0,316
187,312
0,311
0,311
0,311
193,165
174,534
174,665
Tabel 1.2 Hasil Uji Kekerasan Permukaan Baja Karbon Sedang Sesudah
Mengalami Proses Quenching Dengan Media Pendingin Oil
Diameter Bahan Uji (d)
= 16 mm
Tinggi Bahan Uji (h)
= 10 mm
Suhu Pemanasan (T)
= 850oC
Beban (F)
= 10 kgf
Universitas Sumatera Utara
No
1
2
3
Bahan
Original
2 Jam
4 Jam
Kode
Sampel
A
B
C
Diagonal identitas
Kekerasan Vickers
(HV)kgf/mm2
D=
Hasil
(a+b)/2
kekerasan
0,300
0,304
201,564
0,327
0,327
0,327
174,942
0,313
0,320
0,316
187,313
0,321
0,321
0,321
180,038
0,278
0,278
0,278
240,831
0,276
0,276
0,276
243,999
0,275
0,275
0,275
247,252
0,268
0,282
0,275
247,252
0,286
0,286
0,286
228,936
0,285
0,289
0,287
226,145
0,274
0,277
0,275
247,252
0,278
0,272
0,275
247,252
0,289
0,286
0,287
226,145
0,285
0,285
0,285
228,936
0,236
0,226
0,231
349,886
0,261
0,261
0,261
272,704
0,271
0,271
0,271
254,026
0,283
0,278
0,280
237,743
0,287
0,287
0,287
226,145
0,286
0,286
0,286
228,936
0,281
0,281
0,281
237,743
0,293
0,275
0,284
231,800
0,299
0,280
0,289
223,419
0,284
0,272
0,278
240,830
0,258
0,258
0,258
280,969
0,266
0,266
0,266
264,914
a(mm)
b(mm)
0,308
Rata-rata
185,964
238,400
250,323
Universitas Sumatera Utara
4
5
6 Jam
8 Jam
D
E
0,266
0,266
0,266
264,914
0,266
0,266
0,266
264,914
0,282
0,270
0,276
243,999
0,272
0,265
0,268
261,183
0,289
0,269
0,279
240,831
0,288
0,269
0,278
240,831
0,289
0,272
0,280
237,743
0,295
0,275
0,285
228,938
0,246
0,235
0,240
325,332
0,268
0,263
0,265
264,914
0,263
0,263
0,263
268,752
0,273
0,262
0,267
261,182
0,280
0,261
0,270
257,553
0,269
0,269
0,269
257,553
0,280
0,280
0,280
237,743
0,289
0,278
0,283
231,800
0,287
0,287
0,283
231,800
0,287
0.279
0,283
231,800
252,923
256,842
Universitas Sumatera Utara
LAMPIRAN 2
GAMBAR PENELITIAN
1. Tungku Pembakaran
2.Peneliti Sedang Membersihkan
permukaan baja karbon dengan
kertas pasir
3. Peneliti sedang melakukan
4. Peneliti sedang melakukan uji
Pengujian kekerasan dengan
Mikrostruktur dengan alat Metal
Alat Hardness Tester
Microscopy
Universitas Sumatera Utara
HASIL PERHITUNGAN DATA PENGUJIAN BAHAN
= 1,8544
1.1 Kekerasan
Quenching
Sebelum
VHN =
Proses
= 1,8544
VHN2 = 159,860 kgf/mm2
VHN3 = 1,8544
= 1,8544
Bahan
Original
perlakuan )
(Tanpa
VHN3 = 159,860 kgf/mm2
VHN1 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN1 = 201,564 kgf/mm2
VHN4 = 159,860 kgf/mm2
VHN2 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN2 = 174,942 kgf/mm2
VHN5 = 159,860 kgf/mm2
VHN3 = 1,8544
VHN6 = 1,8544
= 1,8544
= 1,8544
VHN3 = 187,313 kgf/mm2
VHN6 = 159,860 kgf/mm2
VHN7 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN7 = 149,548 kgf/mm2
2
VHN4 = 180,038 kgf/mm
VHN = 185,964 kgf/mm2
VHN8 = 1,8544
= 1,8544
Karburasi selama 2 jam
VHN8 = 146,015 kgf/mm2
VHN1 = 1,8544
= 1,8544
VHN1 = 206,044 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 159,860 kgf/mm2
VHN2 = 1,8544
VHN10 = 1,8544
Universitas Sumatera Utara
= 1,8544
VHN7 = 1,8544
VHN10 = 168,581 kgf/mm2
= 1,8544
VHN7 = 170,128 kgf/mm2
VHN = 162,934 kgf/mm2
VHN8 = 1,8544
Karburasi 4 Jam
= 1,8544
VHN1 = 1,8544
VHN8 = 178,306 kgf/mm2
= 1,8544
VHN1 = 185,440 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 159,860 kgf/mm2
VHN2 = 1,8544
= 1,8544
VHN2 = 173,306 kgf/mm2
VHN10 = 1,8544
= 1,8544
VHN10 = 158,495 kgf/mm2
VHN3 = 1,8544
= 1,8544
VHN = 164,703 kgf/mm2
VHN3 = 155,830 kgf/mm2
Karburasi 6 Jam
VHN4 = 1,8544
VHN1 = 1,8544
= 1,8544
VHN4 = 147,174 kgf/mm2
= 1,8544
VHN1 = 164,105 kgf/mm2
VHN5 = 1,8544
VHN2 = 1,8544
= 1,8544
VHN5 = 162,666 kgf/mm2
= 1,8544
VHN2 = 178,306 kgf/mm2
VHN6 = 1,8544
= 1,8544
VHN3 = 1,8544
2
VHN6 = 155,830 kgf/mm
= 1,8544
VHN3 = 170,128 kgf/mm2
Universitas Sumatera Utara
Karburasi 8 Jam
VHN4 = 1,8544
VHN1 = 1,8544
= 1,8544
= 1,8544
VHN4 = 174,942 kgf/mm2
VHN1 = 180,038 kgf/mm2
VHN5 = 1,8544
VHN2 = 1,8544
= 1,8544
= 1,8544
VHN5 = 181,803 kgf/mm2
VHN2 = 178,306 kgf/mm2
VHN6 = 1,8544
VHN3 = 1,8544
= 1,8544
= 1,8544
VHN6 = 167,062 kgf/mm2
VHN3 = 174,942 kgf/mm2
VHN7 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN7 = 168,581 kgf/mm2
VHN4 = 171,702 kgf/mm2
VHN8 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN8 = 178,306 kgf/mm2
VHN5 = 170,128 kgf/mm2
VHN9 = 1,8544
VHN6 = 1,8544
= 1,8544
= 1,8544
VHN9 = 181,803 kgf/mm2
VHN6 = 162,666 kgf/mm2
VHN10 = 1,8544
VHN7 = 1,8544
= 1,8544
= 1,8544
VHN10 = 180,308 kgf/mm2
VHN7 = 161,251 kgf/mm2
VHN = 174,534 kgf/mm2
VHN8 = 1,8544
= 1,8544
Universitas Sumatera Utara
VHN8 = 165,570 kgf/mm2
VHN4 = 1,8544
VHN9 = 1,8544
= 1,8544
= 1,8544
VHN4 = 180,038 kgf/mm2
VHN9 = 165,570 kgf/mm2
VHN = 185,964 kgf/mm2
VHN10 = 1,8544
Karburasi selama 2 jam
= 1,8544
VHN1 = 1,8544
2
VHN10 = 193,165 kgf/mm
= 1,8544
VHN1 = 240,831 kgf/mm2
VHN = 174,665 kgf/mm2
VHN2 = 1,8544
1.2
Kekerasan Sesudah Proses
Quenching menggunakan oli
= 1,8544
VHN2 = 243,999 kgf/mm2
VHN =
= 1,8544
VHN3 = 1,8544
= 1,8544
Bahan
Original
perlakuan )
(Tanpa
VHN3 = 247,252 kgf/mm2
VHN4 = 1,8544
VHN1 = 1,8544
= 1,8544
VHN4 = 247,252 kgf/mm2
= 1,8544
VHN1 = 201,564 kgf/mm2
VHN2 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN2 = 174,942 kgf/mm2
VHN3 = 1,8544
VHN5 = 228,936 kgf/mm2
VHN6 = 1,8544
= 1,8544
= 1,8544
2
VHN3 = 187,313 kgf/mm
Universitas Sumatera Utara
VHN6 = 226,145 kgf/mm2
VHN7 = 1,8544
= 1,8544
VHN7 = 247,252 kgf/mm2
VHN8 = 1,8544
= 1,8544
VHN8 = 247,252 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 226,145 kgf/mm2
VHN4 = 1,8544
= 1,8544
VHN4 = 237,743 kgf/mm2
VHN5 = 1,8544
= 1,8544
VHN5 = 226,145 kgf/mm2
VHN6 = 1,8544
= 1,8544
VHN6 = 228,936 kgf/mm2
VHN7 = 1,8544
= 1,8544
VHN10 = 1,8544
VHN7 = 237,743 kgf/mm2
= 1,8544
VHN10 = 228,936 kgf/mm2
VHN = 238,400 kgf/mm2
Karburasi 4 Jam
VHN8 = 1,8544
= 1,8544
VHN8 = 231,800 kgf/mm2
VHN1 = 1,8544
= 1,8544
VHN1 = 349,886 kgf/mm2
VHN9 = 1,8544
= 1,8544
VHN9 = 223,419 kgf/mm2
VHN2 = 1,8544
= 1,8544
VHN2 = 272,704 kgf/mm2
VHN10 = 1,8544
= 1,8544
VHN10 = 240,830 kgf/mm2
VHN3 = 1,8544
= 1,8544
VHN3 = 254,026 kgf/mm2
VHN = 250,323 kgf/mm2
Karburasi 6 Jam
VHN1 = 1,8544
Universitas Sumatera Utara
= 1,8544
VHN1 = 280,969 kgf/mm2
= 1,8544
VHN9 = 237,743 kgf/mm2
VHN2 = 1,8544
= 1,8544
VHN2 = 264,914 kgf/mm2
VHN10 = 1,8544
= 1,8544
VHN10 = 228,938 kgf/mm2
VHN3 = 1,8544
VHN = 252,923 kgf/mm2
= 1,8544
VHN3 = 264,914 kgf/mm2
Karburasi 8 Jam
VHN1 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN1 = 325,332 kgf/mm2
VHN4 = 264,914 kgf/mm2
VHN2 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN2 = 264,914 kgf/mm2
VHN5 = 243,999 kgf/mm2
VHN6 = 1,8544
VHN3 = 1,8544
= 1,8544
= 1,8544
VHN6 = 261,183 kgf/mm2
VHN3 = 268,752 kgf/mm2
VHN7 = 1,8544
VHN4 = 1,8544
= 1,8544
= 1,8544
VHN7 = 240,831 kgf/mm2
VHN4 = 261,182 kgf/mm2
VHN8 = 1,8544
VHN5 = 1,8544
= 1,8544
= 1,8544
VHN8 = 240,831 kgf/mm2
VHN5 = 257,553 kgf/mm2
VHN9 = 1,8544
VHN6 = 1,8544
Universitas Sumatera Utara
b. Karburasi 4 Jam
= 1,8544
VHN6 = 257,553 kgf/mm2
x100%
HV=
=
VHN7 = 1,8544
=
= 1,8544
x100%
x100%
= 51,911%
2
VHN7 = 237,743 kgf/mm
c. Karburasi 6 jam
HV=
VHN8 = 1,8544
x100%
=
= 1,8544
=
VHN8 = 231,800 kgf/mm2
x100%
x100%
= 44,913%
VHN9 = 1,8544
d. Karburasi 8 Jam
= 1,8544
x100%
HV=
2
VHN9 = 231,800 kgf/mm
=
=
VHN10 = 1,8544
x100%
x100%
= 47,048%
= 1,8544
VHN10 = 231,800 kgf/mm2
VHN = 256,842 kgf/mm2
1.3 Perhitungan persentase
peningkatan kekerasan sesudah
proses quenching
Maka
besarnya
persentase
peningkatan kekerasan baja karbon
menengah
NS-1045
setelah
dilakukan proses Quenching dengan
Oli Mesran SAE 40 adalah :
HV =
HV = 47,547%
x100%
HV=
a. Karburasi 2 Jam
x100%
HV=
=
=
x100%
x100%
= 46,317%
Universitas Sumatera Utara
Universitas Sumatera Utara
Tabel 1.1. Hasil Uji Kekerasan Permukaan Baja Karbon Menengah
Sebelum Proses Quenching
Diameter Bahan Uji (d) = 16 mm
Tinggi Bahan Uji (h)
= 20 mm
Suhu pemanasan (T)
= 950oC
Beban (F)
= 10 kgf
No
1
2
3
Bahan
Original
2 Jam
4 Jam
Kode
Sampel
A
B
C
Diagonal identitas
Kekerasan Vickers
(HV)kgf/mm2
D=
Hasil
(a+b)/2
kekerasan
0,300
0,304
201,564
0,327
0,327
0,327
174,942
0,313
0,320
0,316
187,313
0,321
0,321
0,321
180,038
0,301
0,301
0,301
206,044
0,341
0,341
0,341
159,860
0,342
0,342
0,342
159,860
0,342
0,342
0,342
159,860
0,342
0,342
0,342
159,860
0,342
0,342
0,342
159.860
0,353
0,353
0,353
149,548
0,376
0,339
0,357
146,015
0,342
0,342
0,342
159,860
0,335
0,329
0,332
168,581
0,317
0,317
0,317
185,440
0,328
0,328
0,328
173,306
0,345
0,345
0,345
155,830
0,355
0,355
0,355
147,174
0,338
0,338
0,338
162,666
0,345
0,345
0,345
155,830
a(mm)
b(mm)
0,308
Rata-rata
185,964
162,934
164,703
Universitas Sumatera Utara
4
5
6 Jam
8 Jam
D
E
0,331
0,331
0,331
170,128
0,324
0,324
0,324
178,306
0,341
0,341
0,341
159,860
0,343
0,343
0,343
158,495
0,337
0,337
0.337
164,105
0,329
0,320
0,324
178,306
0,334
0,328
0,331
170,128
0,329
0,326
0,327
174,942
0,336
0,304
0,320
181,803
0,337
0,332
0,334
167,062
0,332
0,332
0,332
168,581
0,329
0,318
0,323
178,306
0,320
0,320
0,320
181,803
0,323
0,322
0,322
180,308
0,321
0,321
0,321
180,038
0,323
0,323
0,323
178,306
0,327
0,327
0,327
174,942
0,329
0,329
0,329
171,702
0,330
0,330
0,330
170,128
0,338
0,338
0,338
162,666
0,340
0,340
0,340
161,251
0,335
0,335
0,335
165,570
0,316
0,316
0,316
187,312
0,311
0,311
0,311
193,165
174,534
174,665
Tabel 1.2 Hasil Uji Kekerasan Permukaan Baja Karbon Sedang Sesudah
Mengalami Proses Quenching Dengan Media Pendingin Oil
Diameter Bahan Uji (d)
= 16 mm
Tinggi Bahan Uji (h)
= 10 mm
Suhu Pemanasan (T)
= 850oC
Beban (F)
= 10 kgf
Universitas Sumatera Utara
No
1
2
3
Bahan
Original
2 Jam
4 Jam
Kode
Sampel
A
B
C
Diagonal identitas
Kekerasan Vickers
(HV)kgf/mm2
D=
Hasil
(a+b)/2
kekerasan
0,300
0,304
201,564
0,327
0,327
0,327
174,942
0,313
0,320
0,316
187,313
0,321
0,321
0,321
180,038
0,278
0,278
0,278
240,831
0,276
0,276
0,276
243,999
0,275
0,275
0,275
247,252
0,268
0,282
0,275
247,252
0,286
0,286
0,286
228,936
0,285
0,289
0,287
226,145
0,274
0,277
0,275
247,252
0,278
0,272
0,275
247,252
0,289
0,286
0,287
226,145
0,285
0,285
0,285
228,936
0,236
0,226
0,231
349,886
0,261
0,261
0,261
272,704
0,271
0,271
0,271
254,026
0,283
0,278
0,280
237,743
0,287
0,287
0,287
226,145
0,286
0,286
0,286
228,936
0,281
0,281
0,281
237,743
0,293
0,275
0,284
231,800
0,299
0,280
0,289
223,419
0,284
0,272
0,278
240,830
0,258
0,258
0,258
280,969
0,266
0,266
0,266
264,914
a(mm)
b(mm)
0,308
Rata-rata
185,964
238,400
250,323
Universitas Sumatera Utara
4
5
6 Jam
8 Jam
D
E
0,266
0,266
0,266
264,914
0,266
0,266
0,266
264,914
0,282
0,270
0,276
243,999
0,272
0,265
0,268
261,183
0,289
0,269
0,279
240,831
0,288
0,269
0,278
240,831
0,289
0,272
0,280
237,743
0,295
0,275
0,285
228,938
0,246
0,235
0,240
325,332
0,268
0,263
0,265
264,914
0,263
0,263
0,263
268,752
0,273
0,262
0,267
261,182
0,280
0,261
0,270
257,553
0,269
0,269
0,269
257,553
0,280
0,280
0,280
237,743
0,289
0,278
0,283
231,800
0,287
0,287
0,283
231,800
0,287
0.279
0,283
231,800
252,923
256,842
Universitas Sumatera Utara
LAMPIRAN 2
GAMBAR PENELITIAN
1. Tungku Pembakaran
2.Peneliti Sedang Membersihkan
permukaan baja karbon dengan
kertas pasir
3. Peneliti sedang melakukan
4. Peneliti sedang melakukan uji
Pengujian kekerasan dengan
Mikrostruktur dengan alat Metal
Alat Hardness Tester
Microscopy
Universitas Sumatera Utara