目的 考察304不锈钢双活性屏离子渗氮技术的可行性及处理效果.方法 利用双活性屏离子渗氮(DASPN)和普通直流离子渗氮(DCPN)两种技术对304不锈钢进行低温(420℃)硬化处理,对比分析两种工艺所得渗层的组织,对比研究两种工艺所得渗层的相结构、硬度和耐蚀性能.结果 采用DASPN技术可获得比采用DCPN技术更为均匀、致密的渗层,渗层为单一S相层,硬度为763 HV0.25.电化学测试表明,两种渗氮技术相比,DASPN处理获得的渗层耐蚀性能更优.结论 采用DASPN技术对304不锈钢进行低温硬化处理,在试样距双屏的距离为70 mm时能够获得比DCPN更好的渗氮效果.该技术适于工业化推广应用.
Objective To explore the feasibility and thermal effectiveness of double active screen plasma nitriding ( DASPN) of 304 stain steel. Methods Nitrided layers were prepared on 304 stainless steel substrate by low terperature DASPN technique and common direct-current plasma nitriding ( DCPN) technique, respectively. The morphology, phase structure, hardness and corro-sion properties of the nitrided layers were comparatively analyzed. Results The nitrided layer produced by DASPN technique was more homogenous and compact compared with that produced by DCPN. It was a single S-phase layer and the hardness of the layer was 763HV0. 25. Moreover, the layer had a better corrosion resistance than that produced by DCPN. Conclusion The thermal ef-fectiveness of 304 steel by DASPN technique was better than that of DCPN treatment, which is probably applicable to commercial process.
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