Nb对中锰TRIP钢临界退火过程中组织演变的影响

doi:10.13251/j.issn.0254-6051.2020.12.041

金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 212-217.DOI: 10.13251/j.issn.0254-6051.2020.12.041

Nb对中锰TRIP钢临界退火过程中组织演变的影响

韩福广¹, 李岩¹, 赵增武¹, 定巍^1,2

1.内蒙古科技大学内蒙自治区白云鄂博矿多金属资源综合利用重点实验室, 内蒙古包头 014010;
2.内蒙古科技大学材料与冶金学院, 内蒙古包头 014010

收稿日期:2020-07-30 出版日期:2020-12-25 发布日期:2021-01-14
通讯作者: 李岩,副教授,博士,E-mail:kenshin110@163.com
作者简介:韩福广(1994—),男,硕士研究生,主要研究方向为钢材性能改性,E-mail:995571801@qq.com。
基金资助:
内蒙古自然科学基金(2019MS05014,2020LH05026)

Effect of Nb on microstructure of medium-manganese trip steel during critical annealing

Han Fuguang¹, Li Yan¹, Zhao Zengwu¹, Ding Wei^1,2

1. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-metal Resources, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. School of Materials and Metallurgy Engineering, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China

Received:2020-07-30 Online:2020-12-25 Published:2021-01-14

摘要/Abstract

摘要： 采用临界退火热处理工艺,利用场发射扫描电镜(FE-SEM)观察含铌和不含铌的两种热轧中锰TRIP钢在不同退火制度下的碳化物演变行为及铌对中锰TRIP钢微观组织、残留奥氏体体积分数与稳定性的影响。结果表明:试验钢经临界退火处理后获得超细晶铁素体与残留奥氏体复相组织。随着退火温度的提高,残留奥氏体体积分数出现先升高后降低的趋势;随着退火时间的延长,碳化物逐渐溶解,残留奥氏体体积分数逐渐增加,达到平衡后保持不变。Nb元素的加入可细化奥氏体晶粒,延缓碳化物溶解,推迟奥氏体转变,增加膜状奥氏体,提高奥氏体稳定性。

关键词: Nb, 中锰TRIP钢, 临界退火, 碳化物演变行为, 残留奥氏体

Abstract: Carbide evolution behavior and the effects of niobium on the microstructure, retained austenite volume fraction and stability of two hot-rolled medium-manganese TRIP steels with and without niobium addition and under different intercritical annealing processes were studied by means of field emission scanning electron microscopy (FE-SEM). The results show that after the intercritical annealing treatment, an (ultrafine grained ferrite+retained austenite) dual-phase structure is obtained. With the increase of annealing temperature, the volume fraction of retained austenite first increases and then decreases; as the annealing time increases, the carbides dissolve gradually, the volume fraction of retained austenite increases gradually until equilibrium then unchanged. The Nb addition can refine austenite grains, delay carbide dissolution, delay austenite transformation, increase film austenite amount, and improve austenite stability.

Key words: Nb, medium-manganese TRIP steel, intercritical annealing, carbide evolution behavior, retained austenite

中图分类号:

TG142.3

韩福广, 李岩, 赵增武, 定巍. Nb对中锰TRIP钢临界退火过程中组织演变的影响[J]. 金属热处理, 2020, 45(12): 212-217.

Han Fuguang, Li Yan, Zhao Zengwu, Ding Wei. Effect of Nb on microstructure of medium-manganese trip steel during critical annealing[J]. Heat Treatment of Metals, 2020, 45(12): 212-217.

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Nb对中锰TRIP钢临界退火过程中组织演变的影响

Effect of Nb on microstructure of medium-manganese trip steel during critical annealing

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