金属热处理 ›› 2021, Vol. 46 ›› Issue (12): 214-217.DOI: 10.13251/j.issn.0254-6051.2021.12.035

• 组织与性能 • 上一篇    下一篇

取向硅钢韧脆转变温度及影响因素

李莉1, 贾志伟1, 张一凡2, 罗理1, 蒋奇武3   

  1. 1.鞍钢集团钢铁研究院, 辽宁 鞍山 114009;
    2.鞍钢股份 冷轧厂, 辽宁 鞍山 114009;
    3.鞍钢股份 制造管理部, 辽宁 鞍山 114044
  • 收稿日期:2021-07-26 出版日期:2021-12-25 发布日期:2022-02-18
  • 作者简介:李 莉(1984—),女,工程师,硕士,主要研究方向为取向硅钢,E-mail:diu_918@126.com

Ductile-brittle transition temperature of a grain-oriented silicon steel and its influencing factors

Li Li1, Jia Zhiwei1, Zhang Yifan2, Luo Li1, Jiang Qiwu3   

  1. 1. Iron & Steel Research Institutes of Ansteel Group Corporation, Anshan Liaoning 114009, China;
    2. Cold Strip Works of Ansteel Limited Company, Anshan Liaoning 114009, China;
    3. Product Development Department of Ansteel Limited Company, Anshan Liaoning 114044, China
  • Received:2021-07-26 Online:2021-12-25 Published:2022-02-18

摘要: 以鞍钢0.27 mm规格高磁感取向硅钢板为研究对象,通过测量不同温度下常化样品的力学性能,结合微观组织和断口形貌观察,确定其韧脆转变温度及影响因素。结果表明:该取向硅钢临界断裂强度约为590 MPa,韧脆转变温度区间为60~80 ℃。在0~100 ℃测试温度范围内,随温度升高,磷元素偏聚浓度由90%左右降低至65%左右,相应平衡时间短,有利于提高晶界结合强度并弱化脆断倾向。此外,常化组织晶粒粗化和铁素体与珠光体不均匀变形产生的微裂纹是脆化的主要组织因素,不利于取向硅钢的冷轧加工。

关键词: 取向硅钢, 韧脆转变温度, 断口形貌, 微观组织, 力学性能

Abstract: Ductile-brittle transition temperature and its influencing factors of 0.27 mm high magnetic grain-oriented silicon steel plate of Ansteel were determined by measuring the mechanical properties of specimen at different normalizing temperatures and observing the microstructure and fracture morphology. The results show that the critical breaking strength of the tested steel is about 590 MPa, and the ductile-brittle transition temperature range is 60-80 ℃. With the increase of test temperature in the range of 0-100 ℃, the phosphorus concentration decreases from about 90% to about 65%, and the corresponding equilibrium time is short, which is beneficial to improve the grain boundary bonding strength and to weaken the brittle fracture tendency. In addition, the coarsening of normalized grains and the microcracks caused by uneven deformation of ferrite and pearlite are the main structural factors of embrittlement, which are not conducive to cold rolling of grain-oriented silicon steel.

Key words: grain-oriented silicon steel, ductile-brittle transition temperature, fracture morphology, microstructure, mechanical properties

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