Effects of Nitriding Temperature on Gas Nitriding Property of Steels for Nitriding
Effects of Nitriding Temperature on Gas Nitriding Property of Steels for Nitriding
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渗氮温度对渗氮钢气体渗氮性能的影响
DOI：
10.2355/tetsutohagane1955.82.2_164
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Y. Kuwahara
中科院分区：
文献类型：
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作者：
N. Ishikawa;T. Shiraga;K. Sato;Moriyuki Ishiguro;H. Kabasawa;Y. Kuwahara
研究了渗氮温度对SACM 645钢气体渗氮性能的影响，旨在开发一种新的渗氮工艺。本研究利用透射电子显微镜观察气体氮化之表面硬化机制。有效渗层深度随渗氮温度的升高而增加。另一方面，随着渗氮温度的升高，表面硬度降低。在氮化层中观察到具有f.c. c结构的复合氮化物（Al，Cr）N的析出。结果表明，在较低的渗氮温度下，由于析出相的细化和在基体上产生大的共格应变，表面硬度提高。通过对几种渗氮温度曲线的分析，得出了连续加热渗氮工艺比其它普通渗氮工艺具有更好的渗氮性能的结论。其原因如下：i）在氮化早期在较低温度下获得的高表面硬度在较高温度下得以保持，ii）在连续加热期间足够量的氮扩散到钢中。
Synopsis : Effects of nitriding temperature on gas nitriding property of SACM645 steels were investigated in order to develop a new nitriding process. In this investigation, TEM observation was performed to study surface hardening mechanism in gas nitriding. Effective case depth increased with nitriding temperature was raised. On the other hand, surface hardness decreased as nitriding temperature increased. Precipitation of complex nitride (Al, Cr) N which has f.c.c structure was observed in the nitrided layer. It is proved that, surface hardness increased at lower nitriding temperature because precipitates became fine and were inducing large coherent strain on matrix. In examining a few patterns of temperature profiles in nitriding, it is concluded that the nitriding process with continuous heating showed better nitriding property than other ordinary nitriding processes. The reasons for this are as follows, i) high surface hardness obtained at lower temperature in the early nitriding stage is maintained in higher temperature, ii) enough amount of nitrogen diffuse into the steel during continuous heating.