两相区配分时间对IQ&P钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.11.022

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 121-125.DOI: 10.13251/j.issn.0254-6051.2020.11.022

两相区配分时间对IQ&P钢组织与性能的影响

常雪, 郑小平, 苏雪, 田亚强, 陈连生

华北理工大学冶金与能源学院, 河北唐山 063210

收稿日期:2020-04-24 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 郑小平,副教授,博士后,硕士生导师,E-mail: zhengxp1978@163.com
作者简介:常雪(1992—),女,硕士研究生,主要研究方向为材料加工新技术与组织性能控制,E-mail: changxmjy@163.com。
基金资助:
国家自然科学基金(51574107);河北省自然科学基金(E2017209121);河北省高等学校科学技术研究项目(ZD2019064);华北理工大学研究生创业创新项目(2019S04)

Effect of partitioning time in intercritical region on microstructure and mechanical properties of IQ&P steel

Chang Xue, Zheng Xiaoping, Su Xue, Tian Yaqiang, Chen Liansheng

College of Metallurgy and Energy, North China University of Science and Technology, Tangshan Hebei 063210, China

Received:2020-04-24 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 以含Cu低碳钢为研究对象,利用SEM、EPMA和拉伸试验研究了两相区配分时间对其组织演变、元素配分以及经IQ&P处理后力学性能的影响,并利用Dictra软件对元素配分行为进行了动力学计算。结果表明,IQ处理后试验钢中的块状马氏体形成于原铁素体区域;随两相区配分时间延长,粒状马氏体数量减少,板条状马氏体之间的间距减小。检测和计算结果的对比显示,C、Mn、Cu 3种元素的相对配分速率与计算结果一致,但实际配分速率低于各自的计算结果。随两相区配分时间延长,经IQ&P处理后试验钢的抗拉强度先增加后减小,而伸长率持续减小;在600 s时达到较好的强塑性匹配,强塑积为16 963.24 MPa·%。

关键词: 两相区配分时间, 动力学计算, 组织演变, 力学性能

Abstract: Taking a Cu-bearing low carbon steel as the research object, the effects of partitioning time in intercritical region on the microstructure evolution, elements partition and the mechanical properties after IQ&P treatment were studied by means of SEM, EPMA and tensile experiment. The kinetics calculation for elements partitioning was carried out by Dictra software. The results show that the block-shaped martensite in the tested steel forms in the initial ferrite region after IQ treatment, and the amount of granular martensite and the distance between lath martensite decrease with the increase of partitioning time in intercritical region. The measuring results show that the relative partition rate of C, Mn and Cu is consistent with the calculated results, but the actual partition rate for these elements is lower than the calculated results. With the increase of partitioning time in intercritical region, the tensile strength of the tested steel after IQ&P treatment first increases and then decreases, while the elongation continues to decrease. When the partitioning time is 600 s, a good comprehensive mechanical property is obtained, and the product of strength and elongation reaches 16 963.24 MPa·%.

Key words: partitioning time in intercritical region, kinetics calculation, microstructure evolution, mechanical properties

中图分类号:

TG142.4

常雪, 郑小平, 苏雪, 田亚强, 陈连生. 两相区配分时间对IQ&P钢组织与性能的影响[J]. 金属热处理, 2020, 45(11): 121-125.

Chang Xue, Zheng Xiaoping, Su Xue, Tian Yaqiang, Chen Liansheng. Effect of partitioning time in intercritical region on microstructure and mechanical properties of IQ&P steel[J]. Heat Treatment of Metals, 2020, 45(11): 121-125.

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两相区配分时间对IQ&P钢组织与性能的影响

Effect of partitioning time in intercritical region on microstructure and mechanical properties of IQ&P steel

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