AISI316奥氏体不锈钢低温渗碳层的组织及耐蚀性  

Microstructure and Corrosion Resistance of Low-Temperature Carburized Layer on AISI316 Austenitic Stainless Steel

作　　者：朱云峰[1] 潘邻[1] 张良界[1] 李朋[1] 马飞[1] 杨闽红[1] 童幸生[2] 王成虎 

机构地区：[1]武汉材料保护研究所,湖北武汉430030 [2]江汉大学教务处,湖北武汉430056 [3]江苏海纳机电集团有限公司,江苏扬中212216

出　　处：《材料保护》2013年第5期27-29,2,共3页Materials Protection

基　　金：国家自然科学基金(50975210)资助

摘　　要：为了提高奥氏体不锈钢的表面硬度并保持其良好的耐蚀性,采用自主开发的低温渗碳工艺对AISI316奥氏体不锈钢进行渗碳处理。运用金相显微镜和显微硬度计表征了渗碳强化层组织,通过电化学试验检测了渗碳强化层的耐蚀性。结果表明:渗碳温度越高,渗碳强化层表面硬度越高,耐蚀性越差;经过470℃低温渗碳处理的AISI316奥氏体不锈钢表面硬度从原来的300 HV0.25 N增加到800～1 000 HV0.25 N,有效硬化层达36.1μm,而其耐蚀性保持不变。A low-temperature carburizing process developed at our laboratory was adopted to carburize AISI316 austenitic stainless steel. The microstructure of resultant carburized reinforcing layer was examined with a metallographic microscope,and its hardness and corrosion resistance were determined with a hardness meter and an electrochemical test rig,respectively. Results showed that elevating carburizing temperature led to increased surface hardness but reduced corrosion resistance of the carburized reinforcing layer. After the stainless steel was carburized at 470 ℃ ,its surface hardness rose from 300 HV 0. 25 N to 800 ～ 1 000 HV 0. 25 N and its effective hardened layer was as thick as 36. 1 μm,while its corrosion resistance remained almost unchanged.

关 键 词：低温渗碳 AISI316奥氏体不锈钢 渗碳强化层 表面硬度 耐蚀性 

分 类 号：TG156.81[金属学及工艺—热处理]