Improving the Cryogenic Strength–Ductility–Toughness of Multi‐Alloy Steel by Optimizing the Feature of Retained Austenite

Author:

Zhou Cheng12ORCID,Ye Qi‐Bin3,Zhao Tan4,Sun Xun12,Jin Lei12

Affiliation:

1. Shenyang Research Institute of Foundry Co., Ltd. CAM Shenyang 110022 China

2. National Key Laboratory of Advanced Casting Technologies Shenyang 110022 China

3. Institute of Research of Iron and Steel, Sha‐steel Zhangjiagang 215625 China

4. State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009 China

Abstract

There is a general inverse relationship between strength and toughness in low‐carbon steels. The transformation‐induced plasticity (TRIP) effect of retained austenite (RA) can help overcome this contradiction by providing strain hardening and transformation toughening during service. In this study, the effect of RA on the microstructure evolution, cryogenic mechanical properties, and fracture behavior of multi‐alloyed Ni‐containing steel is explored. Two well‐established techniques are employed to tailor the RA: quenching–intercritical tempering (QIT) and quenching–lamellarizing–intercritical tempering (QLIT). QLIT steel has a 25.1 vol% RA fraction, which is twice that of QIT steel, and offers exceptional stability at –196 °C. As a result, QLIT steel exhibits superior cryogenic mechanical properties in comparison to QIT steel, including a 6.9% increase in yield strength up to 1228 MPa, a 36.6% increase in elongation up to 33.2%, and a 147.4% increase in impact energy up to 193 J. These improvements are due to the higher fraction of RA transformed into the martensite during tensile deformation, resulting in an enhanced TRIP effect and increased work‐hardening rate. The exceptional stability of the RA also provides more sustainable TRIP toughening during cryogenic impact deformation, which helps to arrest crack propagation.

Publisher

Wiley

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3