Austenite Grain Growth in Heat Affected Zone of Zr-Ti Bearing Microalloyed Steel

作     者：ZHENG Lei YUAN Ze-xi SONG Shen-hua XI Tian-hui WANG Qian 

作者机构：Department of Materials Science and Engineering Shenzhen Graduate School Harbin Institute of TechnologyShenzhen 518055 Guangdong China School of Materials and Metallurgy Wuhan University of Science andTechnology Wuhan 430081 Hubei China Research and Development Center Wuhan Iron and SteelCorporation Wuhan 430080 Hubei China 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2012年第19卷第2期

页      面：73-78页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Sponsored by the Department of Science and Technology of Shenzhen (SY200806260037A) 

主　　题：welding high heat input microstructure 

摘      要：Austenite grain sizes in the heat affected zone （HAZ） of a high heat input welded Zr-Ti bearing microal- loyed steel are measured under different welding conditions simulated by a Gleeble-1500 thermal-mechanical simulator. The austenite grain growth is divided into two regimes in terms of temperature. When the temperature is lower than 1 250℃ where the pinning effect of precipitates is strong, the austenite grain size increases slowly with increas- ing peak temperature, but it increases drastically when the temperature is higher than 1 250 ~C where the pinning effect of precipitates is weak. Based on the experimental measurements, an analytical model for predicting the aus- tenite grain size in the heat affected zone is derived. Model predictions indicate that the initial grain size has little effect on the final one, and the grain growth depends mainly on heat input and peak temperature as well as growth activation energy and exponent. With the use of the model, the width of coarse grained heat affected zone （CGHAZ） for a thick plate is predicted.