Test Method for Effective Case Depth of Ferrous Powder Metallurgy (PM) Parts Using Microindentation Hardness Measurements

2004 ◽  
Author(s):  
Keyword(s):  
Powder Metallurgy ◽  
Case Depth ◽  
Test Method ◽  
Microindentation Hardness ◽  
Effective Case Depth ◽  
Effective Case

Hardness Distribution and Effective Case Depth of Low Carbon Steel after Pack Carburizing Process under Different Carburizer

2015 ◽  
Vol 776 ◽  
pp. 201-207 ◽  
Author(s):  
Dewa Ngakan Ketut Putra Negara ◽  
I. Dewa Made Krisnha Muku ◽  
I. Ketut Gede Sugita ◽  
I. Made Astika ◽  
I. Wayan Mustika ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Case Depth ◽  
Bamboo Charcoal ◽  
Hardness Distribution ◽  
Low Carbon ◽  
Bone Charcoal ◽  
Carburizing Process ◽  
Effective Case Depth ◽  
Effective Case

This research is concerned with the effect of different carburizers on hardness distribution, effective case depth and microstructure of low carbon steel after pack carburizing process. Carburizers to be used were combination of energizer (BaCO3), goat bone charcoal and bamboo charcoal with five different compositions. The specimens were heated to temperature of 950°C, soaked at the temperature for 4 hours and quenched in the water. After the process, microstructures of specimen were observed, the hardness was measured using Vikers method and effective case depths were calculated. The results obtained showed that for all types of carburizer used, the hardness were scattered from surface to the core with lower hardness level. Carburizer composition of 20% BaCO3 + 80% goat bone charcoal produced the highest hardness ( 789.273 HV1) at 0.2 mm from the surface, however, it yielded the lowest effective case depth (0.52 mm). The highest effective case depth of 1 mm was obtained using carburizer composition of 20% BaCO3 + 60% goat bone charcoal + 20% bamboo charcoal. Meanwhile, the original structures of raw material which consist of ferrite and pearlite transformed to hard martensite constituent in the surface after pack carburizing.

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