ST12钢高能喷丸后表面等离子渗钛  

Plasma titanizing on ST12 steel after high-energy shot peening

作　　者：王虎[1] 詹肇麟[1] 吴云霞[1] 李晓宇[1] 于晓华[1] 李莉[1] 刘建雄[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《材料热处理学报》2015年第1期183-186,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51165016)

摘　　要：采用高能喷丸方法,在ST12钢表面获得一定厚度的纳米晶层。喷丸处理后的样品在温度500℃,保温时间为3 h下进行等离子渗钛处理,可以获得一定厚度的渗钛层。运用光学显微镜,扫描电镜,X射线衍射分析和电化学测试系统等测试技术对纳米晶层、渗钛层的组织结构、显微硬度与耐腐蚀性等进行了研究。结果表明,采用高能喷丸法,在ST12钢表面获得一定厚度的纳米晶层。高能喷丸处理可以显著地降低等离子渗钛的温度。渗钛处理后的ST12钢,其显微硬度和耐腐蚀性能得到了提高。By means of high energy shot peening( HESP),a nanocrystallized layer was obtained on the surface of ST12 steel. Plasma titanizing on the surface nanocrystallized ST12 steel was performed at 450 ℃ for 3 h in a vacuum furnace. Microstructure and corrosion properties of the nanocrystallized layer with and without titanizing were characterized by optical microscope,scanning electron microscopy( SEM),X-ray diffraction( XRD) and electrochemical test. Experimental results show that the nanocrystallized layer can be obtained by HESP. HESP greatly accelerates the diffusion of titanium,resulting in the formation of Ti-Fe layer on ST12 steel at relatively low temperature. The microhardness and corrosion resistance of ST12 steel is improved after the titanizing treatment.

关 键 词：高能喷丸 ST12钢 低温 等离子渗钛 

分 类 号：TG668[金属学及工艺—金属切削加工及机床] TG174.445