17%Cr 马氏体/铁素体双相不锈钢的强化和断裂机制

IF 1.9 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Ming-Tao Wang, Yong-Bo Liu, Xu Zhai, Nian-Wang Li, Jian-Feng Jin, Yong-Chao Yang, Yan-Zhong Tian
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引用次数: 0

摘要

为了阐明含有碳化物、铁素体和马氏体的中铬不锈钢(SS)的强化机制,我们制备了不同马氏体含量的 17%Cr SS,并研究了马氏体对微观结构、机械性能和断裂的影响。根据 THERMOCALC 计算结果,17%Cr SS 在 850-1220 °C 的温度范围内,通过奥氏体和 M23C6 中碳的扩散,在奥氏体和铁素体 + M23C6 之间发生可逆相变。随着马氏体含量的增加,M23C6 减少,马氏体晶粒尺寸增大,铁素体晶粒尺寸先增大后减小。与此同时,屈服强度和极限抗拉强度增加,而均匀伸长率和均匀后伸长率均下降。还发现随着马氏体含量的增加,加工硬化指数降低,加工硬化率增加。在拉伸载荷下,17%Cr SS 中存在三种类型的空隙:A 型空隙仅存在于无马氏体材料的晶界(GB)区域与 M23C6 之间;B 型和 C 型空隙分别存在于靠近马氏体晶粒的铁素体晶粒以及铁素体/马氏体晶界(GB)区域。马氏体含量的增加会导致更多的空隙,这表明马氏体会降低材料的塑性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mechanisms of Strengthening and Fracture in 17%Cr Martensite/Ferrite Dual-Phase Stainless Steels

Mechanisms of Strengthening and Fracture in 17%Cr Martensite/Ferrite Dual-Phase Stainless Steels

To clarify the strengthening mechanisms of medium-chromium stainless steels (SSs) with carbides, ferrite, and martensite, 17%Cr SSs with varying martensite contents have been prepared, and the influence of martensite on microstructure, mechanical properties, and fracture has been investigated. According to THERMOCALC calculations, 17%Cr SS undergo a reversible phase transition between austenite and ferrite + M23C6 through the diffusion of carbon in austenite and M23C6 in the temperature range of 850–1220 °C. As the martensite content increases, M23C6 decreases, the martensite grain size increases, and the ferrite grain size initially increases and then decreases. Meanwhile, the yield strength and ultimate tensile strength increase, while both the uniform and post-uniform elongation decrease. It is also found a decrease in work-hardening index and an increase in work-hardening rate with increasing martensite content. Under tensile loading, three types of voids are present in 17%Cr SS: type A only in the grain boundary (GB) area with M23C6 in martensite-free material and type B and C in ferrite grains close to martensite grains and at ferrite/martensite GBs, respectively. An increase in martensite content leads to more voids, indicating a reduction in material plasticity caused by martensite.

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来源期刊
steel research international
steel research international 工程技术-冶金工程
CiteScore
3.30
自引率
18.20%
发文量
319
审稿时长
1.9 months
期刊介绍: steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming
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