Development of powder bed fusion – laser beam process for AISI 4140, 4340 and 8620 low-alloy steel

IF 1.9 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy Pub Date : 2022-10-17 DOI:10.1080/00325899.2022.2134083

W. Hearn, P. Harlin, E. Hryha

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引用次数: 3

Abstract

ABSTRACT This study focuses on process development and mechanical property evaluation of AISI 4140, 4340 and 8620 low-alloy steel produced by powder bed fusion – laser beam (PBF-LB). Process development found that increasing the build plate preheating temperature to 180°C improved processability, as it mitigated lack of fusion and cold cracking defects. Subsequent mechanical testing found that the low-alloy steels achieved a high ultimate tensile strength (4140:∼1400 MPa, 4340:∼1500 MPa, 8620:∼1100 MPa), impact toughness (4140:∼90–100 J, 4340:∼60–70 J, 8620:∼150–175 J) and elongation (4140:∼14%, 4340:∼14%, 8620:∼14–15%) that met or exceeded the ASTM standards. Mechanical testing also revealed limited directional anisotropy that was attributed to low levels of internal defects (< 0.1%), small grains with weak crystallographic texture and improved tempering due to build plate preheating and post PBF-LB stress relief. This indicates that with adequate process development, low-alloy steels produced by PBF-LB can meet or exceed the performance of conventionally produced alloys.

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AISI 4140、4340和8620低合金钢粉末床熔化-激光束工艺的发展

摘要本研究的重点是通过粉末床熔融-激光束（PBF-LB）生产AISI 4140、4340和8620低合金钢的工艺开发和力学性能评估。工艺开发发现，将构建板预热温度提高到180°C可以改善可加工性，因为它减轻了未熔合和冷裂缺陷。随后的机械测试发现，低合金钢达到了较高的极限抗拉强度（4140:～1400 MPa，4340:～1500 MPa，8620:～1100 MPa）、冲击韧性（4140:～90–100 J、4340:～60–70 J、8620:～150–175 J）和伸长率（4140:~14%、4340:~14%、8620:~14–15%）达到或超过ASTM标准。机械测试还显示，有限的方向各向异性归因于低水平的内部缺陷(< 0.1%）、具有弱结晶织构的小晶粒以及由于构建板预热和PBF-LB后应力消除而改善的回火。这表明，随着工艺的充分发展，PBF-LB生产的低合金钢可以达到或超过传统生产的合金的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Metallurgy 工程技术-冶金工程

CiteScore

2.90

自引率

7.10%

发文量

审稿时长

3 months

期刊介绍： Powder Metallurgy is an international journal publishing peer-reviewed original research on the science and practice of powder metallurgy and particulate technology. Coverage includes metallic particulate materials, PM tool materials, hard materials, composites, and novel powder based materials.