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ID:51417512
大小:6.41 MB
页数:4页
时间:2020-03-24
《奥氏体不锈钢低温离子-气体复合硬化处理工艺.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第41卷第10期Vol畅41No畅102016年10月HEATTREATMENTOFMETALSOctober2016奥氏体不锈钢低温离子-气体复合硬化处理工艺杨广义,王永雷,周梦飞,赵程(青岛科技大学机电工程学院表面技术研究所,山东青岛266061)摘要:采用离子轰击去除不锈钢表面的钝化膜,并活化试样的表面,然后再进行低温气体渗碳处理。经过反复几次循环处理后,实现AISI316L奥氏体不锈钢表面低温硬化处理。利用显微硬度计测试表面硬度、硬度梯度;用光学显微镜观察硬化层横截面的显微组织。结果表明,在渗碳温度为440~590℃内,硬化层的表
2、面硬度及厚度与渗碳温度和循环处理周期成正比。温度在440~510℃内,硬化层增厚相对比较缓慢;当渗碳温度超过510℃后,硬化层的厚度增速加快。在440~530℃之间,硬化层表面硬度基本保持不变,在530℃之后,硬化层的表面硬度继续增加。在3~7个循环处理周期内,硬化层厚度增长速度较快,在第7个循环处理周期后,硬化层厚度增长速度变慢。不降低耐蚀性能的奥氏体不锈钢低温渗碳硬化处理的临界温度为530℃。关键词:奥氏体不锈钢;表面硬化处理;离子轰击活化;低温气体渗碳中图分类号:TG156.8文献标志码:A文章编号:0254-6051(2016)1
3、0-0133-04Ion-gassurfacehardeningprocessofausteniticstainlesssteelatlowtemperatureYangGuangyi,WangYonglei,ZhouMengfei,ZhaoCheng(SurfaceEngineeringLaboratory,QingdaoUniversityofScienceandTechnology,QingdaoShandong266061,China)Abstract:Toremovepassivationmembraneofthestainle
4、sssteelsurfacebyionbombardmentandactivatethesurfaceofthespecimen,thenthelowtemperaturegascarburizedhardeningprocesswascarriedout.Afterseveraltimescyclictreatment,thelowtemperaturehardeningtreatmentofAISI316Lausteniticstainlesssteelsurfacewasrealized.Thesurfacehardness,har
5、dnessgradientofthehardenedlayerwastestedbyVickershardnesstester.Thecross-section摧smicrostructureofthehardenedlayerwasobservedbyopticalmicroscope.Theresultsshowthatthehardnessandthicknessofthehardenedlayerareproportionaltothecarburizingtemperatureandprocessingcyclesinthera
6、ngeof440-590℃.Intherangeof440-510℃,thehardeninglayerincreasesrelativelyslowly;whenthecarburizingtemperatureisover510℃,thethicknessofthehardenedlayerincreasesrapidly.Intherangeof440-530℃,thesurfacehardnessofthehardenedlayerbasicallyremainedunchanged,andthesurfacehardnessof
7、thehardenedlayercontinuallyincreasesabove530℃.Inthe3-7cycles,thethicknessofthehardenedlayerincreasesrapidly,andthethicknessofhardenedlayerincreasesslowlyover7cycles.Thecriticaltemperatureofcarburizingofausteniticstainlesssteelwithoutreducingthecorrosionresistanceis530℃.Ke
8、ywords:austeniticstainlesssteel;surfacehardening;ionbombardmentactivation;lowtemperaturegascarbu
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