淬火温度对非均质淬火-配分钢组织和性能的影响

doi:10.13251/j.issn.0254-6051.2023.10.010

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 72-77.DOI: 10.13251/j.issn.0254-6051.2023.10.010

淬火温度对非均质淬火-配分钢组织和性能的影响

张超¹, 尉贺宝², 熊志平¹

1.北京理工大学材料学院冲击环境材料技术国家级重点实验室, 北京 100081;
2.上海中研仪器制造有限公司, 上海 201411

收稿日期:2023-06-23 修回日期:2023-08-30 出版日期:2023-10-25 发布日期:2023-12-07
通讯作者: 熊志平,副教授,博士,E-mail:zpxiong@bit.edu.cn
作者简介:张超(1992—),男,博士研究生,主要研究方向为淬火-配分钢,E-mail:ilovechaozhang@163.com。
基金资助:
国家自然科学基金(52271004,51901021);北京理工大学科技创新计划创新人才科技专项计划(2019CX01019)

Effect of quenching temperature on microstructure and properties of steel treated by heterogeneous quenching and partitioning

Zhang Chao¹, Yu Hebao², Xiong Zhiping¹

1. National Key Laboratory of Science and Technology on Materials under Shock and Impact, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
2. Shanghai Scientific Instrument Manufacturing Co., Ltd., Shanghai 201411, China

Received:2023-06-23 Revised:2023-08-30 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 采用以Mn配分珠光体为初始组织的快速淬火-配分工艺,研究了淬火温度对非均质淬火-配分钢的微观组织和力学性能的影响规律。结果表明,当高温奥氏体继承了珠光体中富Mn渗碳体和贫Mn铁素体中的Mn分布时,可在淬火后获得由富Mn片状残留奥氏体与贫Mn马氏体板条构成的鬼珠光体区域。随淬火温度的升高,高温奥氏体向马氏体转变的驱动力降低,导致鬼珠光体区域减少,块状残留奥氏体数量增多、且尺寸增大。由于鬼珠光体区域减少,马氏体板条的细晶强化效果减弱,造成屈服强度降低;块状残留奥氏体的增加,提供了更强烈的TRIP效应,同时改善了抗拉强度和均匀延伸率,但块状残留奥氏体形成的脆性马氏体降低了颈缩后的延伸率。由此可见,通过调控淬火温度,能够在保证高抗拉强度(约1600 MPa)和高断裂总延伸率(约20%)的基础上,实现对屈服强度和均匀延伸率的进一步调控。

关键词: 淬火-配分钢, 残留奥氏体, 微观组织, 力学性能, 锰配分

Abstract: By using a fast quenching & partitioning process to treat a partitioned Mn pearlite steel to obtain Mn-heterogeneous austenite, the effect of quenching temperature on the microstructure evolution and mechanical properties of the steel was systematically investigated. The results show that when high temperature austenite inherits the Mn distribution in Mn-rich cementite and Mn-poor ferrite in pearlite, ghost pearlite which consists of alternative Mn-enriched film retained austenite(RA) and Mn-depleted lath martensite can be obtained after quenching. With the increase of quenching temperature, the driving force of austenite-to-martensite transformation decreases, which leads to the decrease of ghost pearlite fraction and the increase of fraction and size of blocky RA. Due to the decrease of ghost pearlite fraction, the average width of martensite lath increases, resulting in the decreased yield strength. Moreover, the increased fraction and size of blocky RA ensure an increased uniform elongation by transformation-induced plasticity effect, whereas the transformation product (i.e., fresh martensite) is detrimental to the post-uniform elongation. Therefore, tuning the quenching temperature provides an effective strategy to tailor yield strength and uniform elongation while maintaining large ultimate tensile strength (about 1600 MPa) and total elongation (about 20%).

Key words: quenching and partitioning steel, retained austenite, microstructure, mechanical properties, manganese partitioning

中图分类号:

TG142.1

张超, 尉贺宝, 熊志平. 淬火温度对非均质淬火-配分钢组织和性能的影响[J]. 金属热处理, 2023, 48(10): 72-77.

Zhang Chao, Yu Hebao, Xiong Zhiping. Effect of quenching temperature on microstructure and properties of steel treated by heterogeneous quenching and partitioning[J]. Heat Treatment of Metals, 2023, 48(10): 72-77.

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淬火温度对非均质淬火-配分钢组织和性能的影响

Effect of quenching temperature on microstructure and properties of steel treated by heterogeneous quenching and partitioning

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