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

doi:10.11896/cldb.18080071

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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 B_s, the start temperature for martensite transformation M_s, the finish temperature for phase transformation T_f) 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 (f_b) 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

Published: 31 July 2019

CLC number:	TG113
	TG115

Fund:This work was financially supported by the National Natural Science Foundation of China (51674056).

About author:: Li Tang, female, born in 1993, is a postgraduate student, published 2 journal papers, and presided over a National Science and Technology Innovation Project for Postgraduate Students.
Limeng Yinobtained his Ph.D. degree in material processing engineering from the South China University of Technology in Jun. 2009. He served in School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology till now upon graduation, and is currently a professor and master supervisor and subdecanal. His research interests focus on the welding technology and simulation of high performance oil and gas pipe, and electronic packaging materials and reliability. He performed collaborative research in 2011—2012 in University of Maryland, College Park. He obtained 4 science and technology progress awards of province and ministry as the first author, and performed more than 10 projects, including the Natural Science Foundation of China (General Program), Provincial or Ministry level Projects. In addition, he has published more than 50 journal papers, applied 10 national invention patents and 4 of them were authorized, and he is also a reviewer of several academic journals.

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	TANG Li
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Cite this article:

TANG Li,YIN Limeng,WANG Jinzhao, et al. Continuous Cooling Transformation Behaviors and Bainite Transformation Kinetics of X80 Pipeline Steel During the Second Thermal Cycle[J]. Materials Reports, 2019, 33(18): 3119-3124.

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http://www.mater-rep.com/EN/10.11896/cldb.18080071 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3119

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