摘要
对双相不锈钢S32750进行800℃常规粉末法渗硼以及交流电场增强粉末法渗硼,并对交流电场渗硼后的试样进行固溶处理。利用光学显微镜、显微硬度计以及X射线衍射仪观察分析渗硼层组织、厚度、硬度以及相结构。结果表明:交流电场增强粉末法渗硼层与常规粉末渗硼的形貌相似,其与基体之间的界面基本平直,呈非锯齿状,与基体结合良好,表层主要为FeB;施加交流电场可以有效促进硼的渗入,提高渗层硬度。但当电流提高至6 A时,渗层中会出现较多微孔。S32750钢在5 A交流电场渗硼后再经固溶处理,渗层厚度略增,FeB相显著减少,Fe_(2)B增加,渗硼过程中出现的析出相σ固溶进基体,这有助于双相不锈钢韧性的提高。
Conventional pack boriding(CPB)and alternating current field enhanced pack boriding(ACFPB)were performed at 800℃ on S32750 duplex stainless steel,and an ACFPB treated specimen was later subjected to solution treatment.The microstructure,thickness,hardness and phase structure of the borided layer were investigated by optical microscope,X-ray diffraction and microhardness testing,respectively.The results show that the morphology of the ACFPB layer is similar to that of the CPB layer,with a flat front and good bonding with the substrate,and the surface layer is composed of mainly FeB.Applying alternating current field(ACF)during boriding can effectively promote the diffusion of boron and increase the hardness of the borided layer.However,when the current increases to 6 A,more micropores appear in the borided layer.The solution treatment for the 5 A ACFPB treated S32750 steel results in a slight increase in the thickness of the borided layer,a significant decrease in the amount of FeB phase,an increase in the amount of Fe_(2)B,and the precipitated phase σ formed during boriding is dissolved into the matrix,which helps to improve the toughness of the duplex stainless steel.
作者
武贤龙
谢飞
Wu Xianlong;Xie Fei(School of Materials Science and Engineering,Changzhou University,Changzhou Jiangsu 213164,China;Key Laboratory of Materials Surface Engineering of Jiangsu Province,Changzhou University,Changzhou Jiangsu 213164,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第7期168-173,共6页
Heat Treatment of Metals
基金
国家自然科学基金(51171032)。
