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

钢铁研究学报(英文版), 2012, 19(2): 73-78.

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1.Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology,Shenzhen 518055, Guangdong, China

2.School of Materials and Metallurgy, Wuhan University of Science andTechnology, Wuhan 430081, Hubei, China

3.Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology,Shenzhen 518055, Guangdong, China

4.Research and Development Center, Wuhan Iron and SteelCorporation, Wuhan 430080, Hubei, China

5.School of Materials and Metallurgy, Wuhan University of Science andTechnology, Wuhan 430081, Hubei, China

基金项目: Item Sponsored by the Department of Science and Technology of Shenzhen(SY200806260037A)

关键词：奥氏体晶粒长大 , 热影响区 , 微合金钢 , 奥氏体晶粒尺寸 , 轴承 , 热模拟实验机 , 温度制度 , 预测分析

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

Keywords： welding , high heat input , microstructure ,

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.

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

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