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材料导报  2019, Vol. 33 Issue (18): 3119-3124    https://doi.org/10.11896/cldb.18080071
  金属与金属基复合材料 |
X80管线钢二次热循环的连续冷却转变行为及贝氏体相变动力学
唐丽1, 尹立孟1, 王金钊1, 刘成1, 王学军2
1 重庆科技学院冶金与材料工程学院,重庆 401331
2 四川石油天然气建设工程有限责任公司,成都 610041
Continuous Cooling Transformation Behaviors and Bainite Transformation Kinetics of X80 Pipeline Steel During the Second Thermal Cycle
TANG Li1, YIN Limeng1, WANG Jinzhao1, LIU Cheng1, WANG Xuejun2
1 School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331
2 Sichuan Oil and Gas Construction Engineering Co., Ltd, Chengdu 610041
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摘要 利用高温相变仪DIL805A/D实现了X80管线钢的焊接热模拟实验,采用OM、SEM、TEM和显微硬度计来获得不同连续冷却速率下X80管线钢的显微组织和硬度,进而建立了二次热循环下热影响区的连续冷却转变曲线(SHCCT曲线),并研究贝氏体相变机制及相变动力学。此外,还构建了相变点-冷却速率之间的回归模型,获得了高拟合精度的Bs、Ms、Tf与冷却速率v之间的定量关系。结果表明:在二次热循环不同冷却速率下,X80的组织依次为:先共析铁素体(0.5～1 ℃/s)、贝氏体(5～50 ℃/s)、板条马氏体(大于75 ℃/s);当冷却速率小于100 ℃/s时,显微硬度随冷却速率增大而增加,当冷却速率超过100 ℃/s后,硬度维持在332.5HV1左右;贝氏体相变局部激活能随其体积分数(fb)的增加而减小,平均激活能约为108.6 kJ/mol,且贝氏体转变的主导生长机制是一维生长和二维生长。
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唐丽
尹立孟
王金钊
刘成
王学军
关键词:  X80管线钢  二次热循环  显微组织  SHCCT曲线  相变动力学    
Abstract: Based on the welding thermal simulation of X80 pipeline steel by using DIL805A/D quenching dilatometers, the microstructure and hardness of X80 pipeline steel with different continuous cooling rates were obtained by means of OM, SEM, TEM and micro-hardness testing, and continuous cooling transformation curves of X80 heat-affected zone (SHCCT curves) during the second thermal cycle was determined. The bainite transformation mechanism and bainite transformation kinetics were studied by means of kinetic analysis. In addition, the regression model of phase transformation point-cooling rate was established, also, quantitative equations between the phase transformation point (including the start temperature for bainite transformation Bs, the start temperature for martensite transformation Ms, the finish temperature for phase transformation Tf) and the cooling rate with high fit degree was obtained by regression calculation. The results show that the most dominant microstructure of X80 pipeline steel after the second thermal cycle at different cooling rates appears successively such as, proeutectoid ferrite (0.5—1 ℃/s), bainite (5—50 ℃/s), lath martensite (75 ℃/s and above cooling rates), especially. When the cooling rate is less than 100 ℃/s, the hardness increases with the increase of cooling rate. On the contrary, the hardness remains at about 332.5HV1 when the cooling rate exceeds 100 ℃/s. As the volume fraction of bainite transformation (fb) increases, the local activation energy decreases and the average energy is about 108.6 kJ/mol, and the dominating mechanism of bainite transformation is the two-dimensional and one-dimensional growth.
Key words:  X80 pipeline steel    second thermal cycle    microstructure    SHCCT curves    transformation kinetics
               出版日期:  2019-09-25      发布日期:  2019-07-31
ZTFLH:  TG113  
  TG115  
基金资助: 国家自然科学基金(51674056)
通讯作者:  yeenlm@cqust.edu.cn   
作者简介:  唐丽,女,1993年生,硕士研究生,发表学术论文2篇,主持研究生科技创新项目1项。
尹立孟,教授、副院长,硕士研究生导师,主要研究方向为高性能油气管材焊接技术与模拟、电子封装材料与可靠性。2009年6月在华南理工大学获得材料加工工程专业工学博士学位,毕业后在重庆科技学院任教至今,其中,在2011—2012年到美国马里兰大学进行访学研究。以第一完成人获省部级科技进步奖4项,主持包括国家自然科学基金项目(面上项目)、省部级项目等10多项,在国内外学术期刊上发表论文50余篇,申请国家发明专利10余项,其中授权4项。同时,还担任多个学术期刊的审稿人。
引用本文:    
唐丽, 尹立孟, 王金钊, 刘成, 王学军. X80管线钢二次热循环的连续冷却转变行为及贝氏体相变动力学[J]. 材料导报, 2019, 33(18): 3119-3124.
TANG Li, YIN Limeng, WANG Jinzhao, LIU Cheng, WANG Xuejun. Continuous Cooling Transformation Behaviors and Bainite Transformation Kinetics of X80 Pipeline Steel During the Second Thermal Cycle. Materials Reports, 2019, 33(18): 3119-3124.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.18080071  或          http://www.mater-rep.com/CN/Y2019/V33/I18/3119
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