钨钼钇共渗强化层的回火硬度及红硬性  

Tempering Hardness and Red-hardness of Strengthen-layer after Plasma W-Mo-Y Surface Alloying Process

作　　者：吴宏观[1] 蔡航伟[2] 马志康[2] 王成磊[2] 李冰[2] 高原[2] 

机构地区：[1]江汉大学机电与建筑工程学院,武汉430056 [2]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《中国表面工程》2012年第2期63-68,共6页China Surface Engineering

基　　金：国家自然科学基金(50764002);信息材料广西重点实验室主任研究课题(桂科能0710908-06-Z);广西区自然科学基金(2010GXNSFD013008)

摘　　要：利用双层辉光等离子渗金属技术,在Q235钢表面分别进行钨钼钇共渗与钨钼共渗,形成均匀致密合金扩散层;共渗后,将两种试样分别在960℃、980℃、1020℃下进行8h渗碳及淬火,并在200℃低温回火1h。之后将两者在1 020℃渗碳及淬火,并分别进行200～700℃回火。采用显微硬度仪检测其表面硬度,采用光学显微镜、SEM及EDS分别对渗层进行金相组织及成分分析。结果表明:其回火特征与冶金高速钢类似,在500℃时出现"二次硬化"现象,回火硬度达到峰值,且前者高于后者。将经过1 020℃渗碳淬火后的两种试样在600℃下保温1h后空冷,重复4次后,前者与后者的表面硬度最大值分别达到750 HV0.05、650HV0.05。A uniform dense alloying-diffusion-layer on the surface of Q235 steel was formed by the double glow plasma W-Mo-Y surface alloying process and W-Mo surface alloying process respectively in order to form.Then they were conducted low temperature tempering process at 200 ℃ for 1 h after carburizing and quenching process at 960 ℃,980 ℃ and 1 020 ℃ for 8 h respectively.Afterwards two surface alloys were carburized and quenched at 1 020 ℃,and then tempered at 200~700 ℃ respectively.The micro-hardness and its distribution,microstructure and content distribution of alloying layer were analyzed respectively by microhardness tester,metalloscope,SEM and EDS.The results is showed as follows： the tempering behavior of the layers is the same as that of the metallurgy high speed steel.The secondary hardening occures at 500 ℃,when the tempering hardness reaches the maximum,higher than that of W-Mo surface alloy.When two surface alloys that are conducted by carburizing and quenching process at 1 020 ℃ are air cooled after thermal insulating at 600℃ for 1 h,their maximum hardness values become 750 HV0.05 and 650 HV0.05 respectively after being repeated for 4 times.

关 键 词：钨钼钇共渗 钨钼钇共渗强化层 回火硬度 红硬性 

分 类 号：TG174.445[金属学及工艺—金属表面处理] TQ156.5[金属学及工艺—金属学]