Influence of Cooling Speed on Transformation Behavior of V-N Microalloyed Steel
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摘要: 采用Gleeble-3500热/力模拟试验机、金相显微镜和显微硬度计研究了V-N微合金钢的连续冷却组织转变规律,分析了冷速对组织及性能的影响。试验结果表明:V-N微合金钢过冷奥氏体连续冷却过程中发生了铁素体析出、珠光体转变、贝氏体转变和马氏体转变;冷却速度影响铁素体分布和晶粒大小;珠光体相变结束临界冷速为7.0℃/s、贝氏体相变开始临界冷速为3.0℃/s、马氏体相变开始临界冷速为15℃/s。Abstract: The microstructure transformation of V-N microalloyed steel during continuous cooling process was simulated with Gleeble-3500 thermomechanical simulator.The influence of cooling speed on microstructure and properties of the steel was analyzed.The results reveal that during continuous cooling of V-N microalloyed steel,precipitation of ferrite and transformation of pearlite,bainite and martensite take place.The cooling speed affects the grain size and distribution of ferrite.The critical cooling rate at the end of pearlite transformation is 7.0℃/s.The critical cooling rates at the start of bainite and martensite transformation are 3.0℃/s and 15.0℃/s respectively.
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Key words:
- V-N microalloyed steel /
- cooling speed /
- CCT curve /
- microstructure
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