| CHEN Lei,JIE Xiao-hua,YU Neng,ZHENG Xiang-xin.Research Progress of Gas Soft-nitriding Technology[J],39(1):81-84 |
| Research Progress of Gas Soft-nitriding Technology |
| Received:October 26, 2009 Revised:February 10, 2010 |
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| DOI： |
| KeyWord:Gas soft-nitriding Nitriding with catalyst Strengthens pressure shot penning Surface nano-crystal-lization |
| Author | Institution |
| CHEN Lei |
Guangdong University of Technology, Guangzhou , China |
| JIE Xiao-hua |
Guangdong University of Technology, Guangzhou , China |
| YU Neng |
Guangdong Greatoo Molds Inc, Jieyang , China |
| ZHENG Xiang-xin |
Guangdong Greatoo Molds Inc, Jieyang , China |
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| Abstract: |
| Gas soft-nitriding is low-temperature nitrocarburising which is mainly based on nitriding.While the nitrogen atoms infiltrate into the steel,a small number of carbon atomsinfiltrate as well to form some extremely small carbides, which act as the medium for nitriding.As the processing temperature is low and the time is short, so the deformation of the steel would become small, brittle could also be reduced. The development of gas soft nitriding, which could improve the surface hardness, inhibit the surface brittle and possess the properity of high-temperature and short-time, was reviewed; The mechanism and reasearch of the performance of gas soft-nitrided layer were described from five aspects respectively as followes: rare-earth catalyzing infiltration, multicomponent co-cementation, cyclic nitriding, controlled atmosphere nitriding and austenitic soft-nitriding. The influences of nano-crystallization by surface strengthens pressure shot penning on gas soft-nitriding of 35 steel were introduced; Development perspectives of the surface nanocrystallization for soft nitriding process were forecasted. |
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