Phase transformation of austempered and quench-tempered gray cast irons under laser surface hardening treatment

IF 1.3 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Cast Metals Research Pub Date : 2021-03-04 DOI:10.1080/13640461.2021.1898150

Bingxu Wang, Yuming Pan, G. Barber, Rui Wang

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引用次数: 1

Abstract

ABSTRACT In this research, the effects of laser surface hardening treatment on the phase transformation of austempered and quench-tempered grey cast irons were investigated. It was found that there were four zones in the matrix of austempered grey cast iron and three zones in the matrix of quench-tempered grey cast iron produced by the laser hardening process. Both cast irons had central laser-hardened zones containing ledeburite (Zone 1) and heat-affected zones (Zone 2) containing martensite. For austempering, an additional heat-affected zone (Zone 3) consisting of tempered ausferrite and a substrate (Zone 4) consisting of ausferrite was formed in the matrix, the dimensions of the laser-hardened and heat-affected regions were independent of the austempering and tempering temperatures. The results reported in this work could be used as a valuable reference for future research on laser-hardened grey cast iron applications. For quench tempering, the substrate (Zone 4) consisted of tempered martensite. Additionally

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奥氏体和调质灰铸铁在激光表面硬化处理下的相变

摘要本研究研究了激光表面硬化处理对等温和调质灰口铸铁相变的影响。结果表明，等温灰口铸铁的基体中存在4个区，激光淬火法灰口铸铁的基体中存在3个区。两种铸铁的中心激光硬化区含有莱氏体(区1)和热影响区(区2)含有马氏体。对于等温回火，在基体中形成了由回火奥铁素体组成的额外热影响区(区3)和由奥铁素体组成的衬底(区4)，激光硬化区和热影响区的尺寸与等温回火温度无关。研究结果可为进一步研究激光硬化灰口铸铁的应用提供参考。淬火回火时，基体(区4)由回火马氏体组成。另外

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来源期刊

International Journal of Cast Metals Research 工程技术-冶金工程

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.