Effect of Heat Treatment on Gradient Microstructure and Tensile Property of Laser Powder Bed Fusion Fabricated 15-5 Precipitation Hardening Stainless Steel

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2023-12-05 DOI:10.1007/s40195-023-01635-3

Sheng Cao, Hongyu Liu, Jin Jiang, Ke He, Binghua Lv, Hao Zhang, Lujie Zhang, Jingrong Meng, Hao Deng, Xiaodong Niu

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Abstract

This work investigated the gradient microstructure evolution and tensile property of LPBF fabricated 15-5 precipitation hardening stainless steel in post-process direct ageing (DA) and solution treating & ageing (STA). The varied microstructures for austenite and small-sized oxide inclusions at different sample heights in the as-built (AB) condition was generally preserved after DA treatment. However, austenite was almost disappeared, and oxide particle grew significantly after the STA treatment. As a result, the tensile property differences in sample top and bottom for AB and DA conditions did not occur in the STA samples. For the influence of post-process heat treatment, the STA condition had the highest yield strength due to the highest volume fraction of nano-sized Cu precipitates. However, the DA specimen had the highest ultimate tensile strength and elongation owing to the considerable amount of austenite phase and associated transformation induced plasticity effect.

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热处理对激光粉末床熔合制备15-5沉淀硬化不锈钢梯度组织和拉伸性能的影响

研究了LPBF制备的15-5沉淀硬化不锈钢在工艺后直接时效(DA)和固溶处理中的梯度组织演变和拉伸性能;老化(STA)。经过DA处理后，在AB条件下不同高度的奥氏体和小尺寸氧化物夹杂物的显微组织基本保持不变。但经STA处理后，奥氏体基本消失，氧化物颗粒明显增大。因此，AB和DA条件下样品顶部和底部的拉伸性能差异在STA样品中没有发生。由于后处理的影响，STA条件下纳米Cu析出物体积分数最高，屈服强度最高。然而，由于大量的奥氏体相和相关的相变引起的塑性效应，DA试样具有最高的极限抗拉强度和伸长率。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.