通过先期处理调整微观结构,使室温淬火隔热钢的 PSE 达到 37.6 GPa-% 的水平

IF 4.8 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
Xu Wang , Yunbo Xu , Jiapeng Guo , Yuan Wang , Jingyi Ren , R.D.K. Misra
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引用次数: 0

摘要

在这项工作中,通过冷轧和预处理,有意设计了不同的初始微观结构,包括变形冷轧结构、淬火马氏体、粒状贝氏体和片状贝氏体。同时,还提出了一种新的室温淬火和分割(RT-Q&P)工艺,以进一步提高铜镍轴承 Q&P 的强度-电导率组合。本研究旨在探讨经室温淬火和分割工艺处理的 Q&P 钢中初始微观组织对奥氏体形成动力学、RA 力学稳定性、微观组织演变和力学性能的影响。与未经预处理的样品相比,经过预处理的样品由于在马氏体/贝氏体基体上有更多的成核点,奥氏体化程度更高。DICTRA 模拟表明,低 C 和低 Mn 的贝氏体基体更有利于母体奥氏体的细化,从而导致细小而分散的 TM/A。在拉伸变形过程中,细小而分散的莱氏体结构可有效缓解因软硬相间的变形性差异而导致的界面上的应变局部化,从而延迟裂纹的产生和扩展。经过 RT-Q&P 处理后,具有贝氏体基体的样品获得了优异的力学性能,其 UTS 为 1152 MPa,TEL 为 32.6 %,YS 为 754 MPa,PSE 为 37.6 GPa-%,远远超过了传统 Q&P 钢的性能,这主要归功于精细分散结构更高的加工硬化能力和 RA 的持续 TRIP 效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tailoring the microstructure by prior treatment to achieve 37.6 GPa·% PSE in a room-temperature quenched and partitioned steel
In this work, different initial microstructures, including deformed cold-rolled structure, quenched martensite, granular bainite, and lathy bainite, were intentionally designed through cold rolling and prior treatment. Meanwhile, a novel room-temperature quenching and partitioning (RT-Q&P) process was proposed to further enhance strength-ductility combination of Cu-Ni bearing Q&P. The present study aims to investigate the influences of initial microstructures on the formation kinetics of austenite, the mechanical stability of RA, microstructure evolution, and mechanical performance in Q&P steel treated by RT-Q&P process. Compared to sample without prior treatment, samples with prior treatment showed a larger austenization degree due to more nucleation sites on martensite/bainite matrix. DICTRA simulation indicates the lathy bainite matrix with low C and low Mn is more conducive to the refinement of parent austenite, thus leading to fine and dispersive TM/A. During tensile deformation, the fine and dispersive lath-structures can effectively alleviate strain localization on the interfaces which resulted from the deformability difference between the soft and hard phases, thereby delaying crack initiation and propagation. After RT-Q&P treatment, the outstanding mechanical properties with UTS of 1152 MPa, TEL of 32.6 %, YS of 754 MPa, and PSE of 37.6 GPa·% was achieved in sample with lathy bainite matrix, far exceeding the properties of traditional Q&P steels, which was mainly attributed to higher work-hardening ability of fine and dispersive structure and sustained TRIP effect of RA.
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来源期刊
Materials Characterization
Materials Characterization 工程技术-材料科学:表征与测试
CiteScore
7.60
自引率
8.50%
发文量
746
审稿时长
36 days
期刊介绍: Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.
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