热处理工艺对H13芯棒钢组织和性能的影响  

Effect of heat treatment procedure on the microstructure and mechanical properties of H13 mandrel steel

作　　者：陆明和[1] 胡平[1] LU Minghe;HU Ping(Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《宝钢技术》2018年第6期32-36,共5页Baosteel Technology

摘　　要：研究了感应加热淬火温度、回火温度对H13芯棒钢组织和硬度性能的影响规律。研究结果表明,在1 000～1 060℃的温度范围内,随着淬火温度的升高,芯棒钢材料的硬度逐渐上升,1 060℃后芯棒钢的硬度基本维持在一个稳定水平;随着淬火温度的升高,原奥氏体晶粒尺寸长大;相同回火温度下细晶组织易于获得回火索氏体组织,粗晶组织易于获得回火托氏体组织;在580～700℃范围内,随着回火温度的升高,芯棒钢材料的硬度呈逐渐降低趋势,这主要与组织中马氏体分解、马氏体碳含量降低、位错密度降低和碳化物粗化有关;芯棒要获得相同的硬度水平,当淬火温度升高时,对应的回火温度也相应升高,呈现"高淬高回"的特点;淬火温度均为1 060℃时,580～620℃的范围内回火组织为回火托氏体,660～700℃的范围内回火组织为回火索氏体。The effect of induction hardening temperature and tempering temperature on the microstructure and hardness property of H13 mandrel steel was investigated.The results showed that in the temperature range between 1 000℃and 1 060℃,with the induction hardening temperature increasing,the hardness of the mandrel steel gradually increased and then reach a stable level regardless of the induction hardening temperature.The prior austenite grain size also increased with the increase in induction hardening temperature.Under the same tempering temperature,mircrostructure with finer grain and coarser grain are individually easy to obtain tempered sorbite and tempered troostite.In the temperature range between 580℃and 700℃,with the tempering temperature raising,the hardness of the mandrel steel gradually decreased,which was due to the martensite decomposition,carbon content and dislocation density droping in the martensite as well as the coarsing of the carbides.In order to get the same hardness level,the tempering temperature need to enhance when the induction hardening temperature increased.When the induction temperature was 1 060℃,tempered troostite formed when choosing the temperature in the range between 580℃and 620℃while tempered sobite formed when the range moved to between 660℃and 700℃.

关 键 词：淬火 回火 组织 硬度 芯棒钢 

分 类 号：TG151[金属学及工艺—热处理]