Microstructure and mechanical properties of 15-5 PH stainless steel under different aging temperature

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Metallurgical Research & Technology Pub Date : 2021-01-01 DOI:10.1051/metal/2021078

Chunhui Jin, Honglin Zhou, L. Yuan, Bei Li, Zhang Kewei, C. Huiqin, Zhao Jinhua

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引用次数: 2

Abstract

The influence of aging temperature on microstructure and mechanical properties of Cr15Ni5 precipitation hardening stainless steel (15-5 PH stainless steel) were investigated at aging temperature range of 440–610 °C. The tensile properties at ambient temperature of the 15-5 PH stainless steel processed by different aging temperatures were tested, and the microstructural features were further analyzed utilizing optical microscope (OM), transmission electron microscope (TEM), electron backscatter diffraction (EBSD) as well as X-ray diffraction (XRD), respectively. Results indicated the strength of the 15-5 PH stainless steel was firstly decreased with increment of aging temperature from 440 to 540 °C, and then increased with the increment of aging temperature from 540 to 610 °C. The strength and ductility were well matched at aging temperature 470 °C, and the yield strength, tensile strength as well as elongation were determined to be 1170 MPa, 1240 MPa and 24%, respectively. The microstructures concerning to different aging temperatures were overall confirmed to be lath martensite. The strengthening mechanisms induced by dislocation density and the second phase precipitation of Cu-enriched metallic compound under different aging temperatures were determined to be the predominant strengthening mechanisms controlling the variation trend of mechanical properties corresponding to different aging temperatures with respect to 15-5 PH stainless steel.

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15-5 PH不锈钢在不同时效温度下的组织与力学性能

在440 ~ 610℃时效温度范围内，研究了时效温度对Cr15Ni5沉淀硬化不锈钢(15-5 PH不锈钢)组织和力学性能的影响。采用光学显微镜(OM)、透射电镜(TEM)、电子背散射衍射(EBSD)和x射线衍射(XRD)分析了经不同时效温度处理的15-5 PH不锈钢的室温拉伸性能，并对其微观组织特征进行了分析。结果表明:随着时效温度从440℃升高到540℃，15-5 PH不锈钢的强度先降低，然后随着时效温度从540℃升高到610℃而升高;时效温度为470℃时，强度和塑性匹配良好，屈服强度为1170 MPa，抗拉强度为1240 MPa，伸长率为24%。不同时效温度下的显微组织均为板条马氏体。在不同时效温度下，位错密度和富cu金属化合物的第二相析出是控制15-5 PH不锈钢力学性能变化趋势的主要强化机制。

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来源期刊

Metallurgical Research & Technology METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.70

自引率

9.10%

发文量

审稿时长

4.4 months

期刊介绍： Metallurgical Research and Technology (MRT) is a peer-reviewed bi-monthly journal publishing original high-quality research papers in areas ranging from process metallurgy to metal product properties and applications of ferrous and non-ferrous metals and alloys, including light-metals. It covers also the materials involved in the metal processing as ores, refractories and slags. The journal is listed in the citation index Web of Science and has an Impact Factor. It is highly concerned by the technological innovation as a support of the metallurgical industry at a time when it has to tackle severe challenges like energy, raw materials, sustainability, environment... Strengthening and enhancing the dialogue between science and industry is at the heart of the scope of MRT. This is why it welcomes manuscripts focusing on industrial practice, as well as basic metallurgical knowledge or review articles.