金属热处理 ›› 2022, Vol. 47 ›› Issue (10): 19-23.DOI: 10.13251/j.issn.0254-6051.2022.10.004

• 组织与性能 • 上一篇    下一篇

回火温度对V-N微合金化铸钢组织及性能的影响

王晓东1,2, 陈蕴博1, 左玲立1, 毛丰2, 张程2, 陈冲2, 王舒3, 崔海林3   

  1. 1.中国机械科学研究总院集团有限公司, 北京 100083;
    2.河南科技大学 金属材料磨损控制与成型技术国家地方联合工程研究中心, 河南 洛阳 471000;
    3.瞬态冲击技术重点实验室, 北京 102202
  • 收稿日期:2022-04-29 修回日期:2022-07-26 出版日期:2022-10-25 发布日期:2022-12-15
  • 作者简介:王晓东(1979—),男,博士,工程师,主要研究方向为低合金耐磨铸钢的研发及推广,E-mail:nmxdwang@163.com
  • 基金资助:
    国家重点研发计划(2020YFB2008400);河南省重点研发与推广专项(222102230059);瞬态冲击技术重点实验室基金资目(6142606211110)

Effect of tempering temperature on microstructure and properties of V-N microalloyed cast steel

Wang Xiaodong1,2, Chen Yunbo1, Zuo Lingli1, Mao Feng2, Zhang Cheng2, Chen Chong2, Wang Shu3, Cui Hailin3   

  1. 1. China Academy of Machinery Science and Technology Group Co., Ltd., Beijing 100083, China;
    2. National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology, Luoyang Henan 471000, China;
    3. Science and Technology on Transient Impact Laboratory, Beijing 102202, China
  • Received:2022-04-29 Revised:2022-07-26 Online:2022-10-25 Published:2022-12-15

摘要: 采用真空熔炼炉制备了两种不同V含量的微合金化铸钢,并对其进行了正火+淬火+不同温度回火处理,研究了回火温度对试验钢组织及性能的影响。结果表明,V含量的增加促进了碳氮化物的析出,降低了C、N在马氏体中的固溶度,使铸钢的冲击吸收能量有所提高。当回火温度低于400 ℃时,强化机制以固溶强化为主,当回火温度高于400 ℃时,强化机制以析出强化为主。V含量的增加还促进了碳氮化物在高温回火时由短杆状向球状的转变,从而有效改善了高温回火脆性。

关键词: 微合金化, 回火, 硬度, 冲击吸收能量

Abstract: Two microalloyed cast steels with different V contents were prepared in a vacuum melting furnace and heat treated by normalizing, quenching and tempering at different temperatures. Effect of tempering temperature on microstructure and properties of the two tested steels with different V contents was studied. The results show that the effect of V content promotes the carbonitride precipitates and reduces the solid solubility of C and N elements in the martensite, resulting in the improvement of impact absorbed energy. When tempering temperature is below 400 ℃, the dominant strengthening mechanism is solution strengthening. When tempering temperature is above 400 ℃, the dominant strengthening mechanism is precipitation hardening. The increase of V content also promotes the carbonitride precipitates shape translating from short rod to granular, and the brittleness of high temperature tempering is improved.

Key words: microalloying, tempering, hardness, impact absorbed energy

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