离子硬化工艺在316L不锈钢阀内件中的应用

对316L奥氏体不锈钢进行离子渗氮(PN)和离子碳氮共渗(PNC)处理,利用光学显微镜、显微硬度计、电化学工作站、粗糙度检测仪和三坐标测量仪对试样渗层厚度、显微硬度、耐腐蚀性、表面粗糙度和变形量进行讨论分析。结果表明:316L钢经离子碳氮共渗处理后的渗层硬度分布较好,可提高耐腐蚀性能。离子碳氮共渗技术可应用于阀内件(包括球芯和阀座)的表面硬化处理,在保证零件尺寸配合公差的条件下,大幅提高阀内件的表面硬度。

Application of plasma hardening process for 316L stainless steel valve inner parts

316L austenitic stainless steel was treated by plasma nitriding (PN) and plasma carbonitriding(PNC) processes. The infiltration layer thickness, microhardness, corrosion resistance, surface roughness and deformation of the steel were discussed and analyzed by means of metallographic microscope, microhardness tester, electrochemical workstation, roughness detector and trilinear coordinates measuring instrument. The results show that plasma carbonitriding can produce infiltration layer with good hardness distribution, which can improve the corrosion resistance of the 316L steel. Plasma carbonitriding technology can be applied as surface hardening treatment of 316L steel valve internals, which can significantly improve the surface hardness under the condition of ensuring the size matching tolerance of parts.