Effects of Quenching Process on Microstructure and Mechanical Properties of Low Carbon Nb-Ti Microalloyed Steel
Wen-Zhen Xia, Xian-Ming Zhao, Xiao-Ming Zhang, Di Wu
(State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China)
Abstract:
The low carbon Nb-Ti microalloyed tested steel was prepared by the process of vacuum induction furnace smelting, forging and hot rolling. The new steel aims to meet the demand of high strength, high toughness and high plasticity for building facilities. The effects of quenching process on microstructure and mechanical properties of tested steel were investigated. The results showed that prior austenite grain size, phase type and precipitation behavior of (Nb,Ti)(C,N) play important roles in mechanical properties of the steel. Through modified appropriately, the model of austenite grain growth during heating and holding is d5.7778=5.64785.7778+7.04×1022t1.6136exp(-427.15×103/(RT)). The grain growth activation energy is Qg=427.15 kJ. During quenching, the microscopic structures are mainly martensite and lath bainite which contains lots of lath substructure and dislocations. The content of phases, fine and coarsening (Nb,Ti)(C,N) precipitated changes during different quenching temperatures and holding time. Finally compared with the hardness value, the best quenching process can be obtained that heating temperature and holding time are 900 ℃ and 50 mins, respectively.
Key words: low carbon Nb-Ti microalloyed steel quenching process austenite grain growth model microstructure and mechanical properties
DOI：10.11916/j.issn.1005-9113.2013.04.012
Clc Number:TG142.1
Fund:
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Effects of Quenching Process on Microstructure and Mechanical Properties of Low Carbon Nb-Ti Microal
本站小编 哈尔滨工业大学/2019-10-24
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