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冷却速率对T91钢相变过程及组织的影响

Effect of Cooling Rate on Phase Transformation Process and Microstructure of T91 Ferritic Heat Resistant Steel

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【作者】 宁保群严泽生付继成别利剑刘永长

【Author】 NING Bao-qun1,2,YAN Ze-sheng3,FU Ji-cheng3,BIE Li-jian1,LIU Yong-chang2(1.School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;2.College of Material Science and Engineering,Tianjin University,Tianjin 300072,China;3.Tianjin Pipe(Group)Corporation,Tianjin 300301,China)

【机构】 天津理工大学材料科学与工程学院天津大学材料科学与工程学院天津钢管集团股份有限公司

【摘要】 利用DIL805A/D高精度差分膨胀仪,通过线膨胀行为测量获得相关动力学信息,结合冷却后的组织特征,研究了T91钢不同冷却速度(2~6000℃/min)下过冷奥氏体的相变过程和产物,确定了该钢组织转变的临界冷却速度以及淬火速率对马氏体转变点及组织的影响,绘制了连续冷却转变曲线。研究表明:T91钢的连续冷却过程中只存在铁素体和马氏体转变区,10℃/min为马氏体转变的临界冷却速度。不同淬火速率对T91钢马氏体开始转变温度有较大的影响,它不同于随冷速增加而相变点升高的经典理论。淬火速率通过碳原子气团、内应力的形成来影响过冷奥氏体状态,从而影响相变点;随淬火速度的增加,过冷奥氏体转变后的组织呈细化趋势。

【Abstract】 The influences of cooling rate in a wide range of 2-6000 ℃/min on phase transformation process and microscopic structure of T91 ferritic heat-resistant steels were studied by high-resolution differential dilatometer.The rule of phase transformation of T91 steel during continuous cooling is clarified.The results show that the martensite critical cooling rate is determined,and the continuous cooling transformation(CCT)curve is obtained.The quenching rate has a significant effect on the onset temperature of martensite transformation.This observation is different from the classical theory that claimed the transformation point falls when cooling rate reduces.The quenching rate determines the transform point by affecting the carbon atomic group and internal stress.With the quenching rate increasing,the structure has a tendency of fining.

【基金】 国家自然科学基金;上海宝钢集团公司联合资助重点项目(50834011);国家自然科学基金资助项目(20571055)
  • 【分类号】TG142.73
  • 【被引频次】23
  • 【下载频次】669
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