热处理工艺对H13芯棒钢组织和性能的影响
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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 was1 060 ℃,tempered troostite formed when choosing the temperature in the range between 580 ℃ and620 ℃ while tempered sobite formed when the range moved to between 660 ℃ and 700 ℃.
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 was1 060 ℃,tempered troostite formed when choosing the temperature in the range between 580 ℃ and620 ℃ while tempered sobite formed when the range moved to between 660 ℃ and 700 ℃.
引文
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[2]夏云峰,张光川,朱文,等.消除H13模具钢网状碳化物的热处理工艺研究[J].大型铸锻件,2017(3):38-40.
[3]朱心昆,赵应富.淬火温度对H13钢性能的影响[J].金属热处理,1994,19(8):28-30.
[4]陈大金. H13钢的热处理工艺研究[J].大型铸锻件,2002(4):41-42.
[5]刘红燕.回火处理对H13模具钢组织和性能的影响[J].热加工工艺,2016,45(10):243-245.
[6]张程,黄进峰,窦梦阳,等. H13钢回火组织及碳化物转变规律[J].金属热处理,2016,41(5):1-5.
[7]刘宗昌,杜志伟,朱文方,等. H13钢的回火二次硬化[J].兵器材料科学与工程,2001,24(3):11-13.
[8]王雅静,刘宗昌,段宝玉. H13钢淬火—回火工艺及组织的研究[J].热处理,2013,28(4):26-31.
[9]刘贵周. H13钢淬火、回火过程中相变的研究[D].沈阳:东北大学,2003.
[10]杜志伟,刘宗昌,朱文方,等. H13钢淬火、回火过程中相变的研究[J].包头钢铁学院学报,2001,20(1):34-36.
[11]樊明强.热处理工艺对H13钢组织性能影响规律的研究[D].石家庄:河北科技大学,2016.
[12]蔡清,冯淑玲.热处理工艺对H13热作模具钢冲击性能的影响[J].机械工程材料,2011,35(S1):82-84.
[13]李勇,陈晶芳.淬火回火工艺对H13钢组织及硬度性能的影响[J].浙江工贸职业技术学院学报,2014,14(4):58-60.
[14]崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2007:268-273.