【摘要】 研究了等离子体注渗氮的温度和注渗电压对1Cr18Ni9奥氏体不锈钢注渗层组织结构、纳米硬度及腐蚀性能的影响规律。结果表明:注渗后表层晶粒细化,表层新相主要有非晶,γN相,氮化物相((Fe,Cr,Ni)2N1-x和(Fe,Cr)2N1-x)及α相。注入电压10kV,450℃可生成非晶,390～420℃生成氮化物相,330～360℃无新相生成。注渗层纳米硬度值升高1.3～4.9倍,并与注渗温度保持单调关系。表层有非晶或γN相生成的试样表现出优越的耐腐蚀性能,没有新相生成的试样耐蚀性变差。更多还原

【Abstract】 The effects of technological parameters such as temperature and voltage on the microstructure,nanohardness and corrosion performance of 1Cr18Ni9 austenitic stainless steel treated by plasma based ion implanting and nitriding technique were investigated.It was found that,the grains in the surface layer were finer after treatment.The microstructure consisted primarily of amorphous phase,expanded austenitic phase,α-phase and nitride phases such as(Fe,Cr,Ni)2N1-x and (Fe,Cr)2N1-x.The amorphous phase was formed when the sample was treated at an applied voltage of 10 kV and at a relatively high temperature of 450 ℃.While the nitrides were formed at moderate temperature ranging from 390 ℃ to 420 ℃.No new phase was detected at relatively low temperatures ranging from 330 ℃ to 360 ℃.The nanohardness of the implanted layers increased from 1.3 times to 4.9 times comparing with the untreated specimen.It showed a monotonic relationship with the treating temperature.Those samples with amorphous layer or expanded austenitic phase exhibited superior corrosion-resistant performance compared those without new phases.更多还原