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AISI 420马氏体不锈钢激光表面硬化中的脱碳现象

Decarburization in Laser Surface Hardening of AISI 420 Martensitic Stainless Steel.

作者信息

Aprilia Aprilia, Maharjan Niroj, Zhou Wei

机构信息

School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

Advanced Remanufacturing and Technology Centre (ARTC), Agency for Science, Technology and Research (A*STAR), 3 CleanTech Loop, Singapore 637143, Singapore.

出版信息

Materials (Basel). 2023 Jan 19;16(3):939. doi: 10.3390/ma16030939.

DOI:10.3390/ma16030939
PMID:36769945
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9918270/
Abstract

Decarburization deteriorates the surface mechanical properties of steel. It refers to the loss of carbon from steel's surface when exposed to an open-air environment in elevated-temperature conditions. Despite the short interaction time and fast thermal cycle of the laser surface-hardening process, decarburization may still occur. This paper investigates if decarburization occurs during the laser surface hardening of AISI 420 martensitic stainless steel. For comparison, surface-hardening results and decarburizations in a conventional air furnace-heated hardening process (water-quenched and air-cooled) of the same steel material were also investigated. Decarburization seems to have occurred in the laser surface hardening of AISI 420SS. However, the decarburization might not be significant, as the hardness of the steel's surface was increased more than three times to 675 HV during the laser surface hardening, and the hardness drop due to decarburization was estimated to be only 3% with the decarburization depth of 40 μm. Simulations using ThermoCalc software to get the carbon concentration profiles along the depth for both laser-hardened and furnace-heated samples were also investigated.

摘要

脱碳会降低钢的表面机械性能。它是指钢在高温条件下暴露于露天环境时表面碳的损失。尽管激光表面硬化过程的相互作用时间短且热循环快，但脱碳仍可能发生。本文研究了AISI 420马氏体不锈钢激光表面硬化过程中是否会发生脱碳。为作比较，还研究了相同钢材在传统空气炉加热淬火（水淬和空冷）硬化过程中的表面硬化结果和脱碳情况。AISI 420不锈钢激光表面硬化过程中似乎发生了脱碳。然而，脱碳可能并不显著，因为在激光表面硬化过程中，钢表面硬度提高了三倍多，达到675 HV，并且由于脱碳导致的硬度下降估计仅为3%，脱碳深度为40μm。还研究了使用ThermoCalc软件模拟获得激光硬化和炉加热样品沿深度的碳浓度分布情况。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9104/9918270/41d38a309276/materials-16-00939-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9104/9918270/41d38a309276/materials-16-00939-g015.jpg

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本文引用的文献

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Effects of Laser Spot Size on the Mechanical Properties of AISI 420 Stainless Steel Fabricated by Selective Laser Melting.激光光斑尺寸对选择性激光熔化制备的AISI 420不锈钢力学性能的影响
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Case Study of the Effect of Precoating on the Decarburization of the Surface Layer of Forged Parts during the Hot Die Forging Process.热模锻过程中预涂层对锻件表层脱碳影响的案例研究
Materials (Basel). 2021 Jan 16;14(2):422. doi: 10.3390/ma14020422.
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Microstructure Evolution and Nanotribological Properties of Different Heat-Treated AISI 420 Stainless Steels after Proton Irradiation.
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