Effect of Ti-Mg-Ca treatment on properties of heat-affected zone after high heat input welding
作者机构：State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China Laboratory for Excellence in Advanced Steels Research Department of Metallurgical Materials and Biomedical Engineering University of Texas at EI Paso EI Faso 79968 TX USA
出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)
年 卷 期：2019年第26卷第5期
页 面：501-511页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the National Key Research and Development Program of China
主 题：Heat-affected zone Microstructure Strain field Impact energy Ca-Mg treatment
摘 要：The combined influence of Mg and Ca treatment on the properties of heat-affected zone (HAZ) of low-carbon steel after high heat input welding was systematically studied. Experimental steels deoxidized with different elements were prepared, i.e., C-Mn steel with Al, Ti-Ca steel with Ti and Ca, Ti-Mg-Ca steel with Ti, Mg and Ca. Results showed that the inclusions in C-Mn steel were mainly Al2O3 and MnS with low density and large size. However, the average size was refined to only ~0.34 μm in Ti-Mg-Ca steel and the amount increased remarkably. Microstructure of simulated HAZ for 200 kJ/cm changed from ferrite side plates or upper bainite to acicular ferrite after treatment with Ti, Mg and Ca. Ca addition decreased the strain field around inclusions and enhanced the ability of acicular ferrite nucleation. In situ observation of Ti-Mg-Ca steel showed that the movement of austenite grain boundaries was retarded and nucleation sites of acicular ferrite were greater than Ti-Ca steel because of Mg addition. Impact energy of HAZ at — 40℃ was increased from 7 to 232 J and showed excellent stability because of Ti-Mg-Ca treatment. High volume fraction of acicular ferrite acted as obstacles toward cleavage cracks.
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