冷却速率对变形与未变形X80管线钢组织的影响

doi:10.3724/SP.J.1037.2010.00005

金属学报

2010, Vol. 46

Issue (8): 959-966 DOI: 10.3724/SP.J.1037.2010.00005

论文

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冷却速率对变形与未变形X80管线钢组织的影响

邓伟,高秀华, 秦小梅, 高鑫, 赵德文, 杜林秀

东北大学轧制技术及连轧自动化国家重点实验室, 沈阳 110819

EFFECT OF COOLING RATE ON MICROSTRUCTURE OF DEFORMED AND UNDEFORMED X80 PIPELINE STEELS

DENG Wei, GAO Xiuhua, QIN Xiaomei, GAO Xin, ZHAO Dewen, DU Linxiu

State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819

引用本文:

邓伟高秀华秦小梅高鑫赵德文杜林秀. 冷却速率对变形与未变形X80管线钢组织的影响[J]. 金属学报, 2010, 46(8): 959-966.
, , , , , . EFFECT OF COOLING RATE ON MICROSTRUCTURE OF DEFORMED AND UNDEFORMED X80 PIPELINE STEELS[J]. Acta Metall Sin, 2010, 46(8): 959-966.

全文: PDF(4604 KB)

摘要:

通过相同温度、不同冷却速率下不变形和变形量为0.7的热模拟压缩实验,研究了冷却速率对变形和未变形X80管线钢组织的影响. 结果表明:与未变形试样比较, 真应变0.7的变形使X80管线钢的贝氏体转变开始温度提高了30-80 ℃, 且冷却速率越大, 相变点越低, 相变经历的时间越短. 无变形试样连续冷却时得到的组织主要为贝氏体, 且存在原始奥氏体晶界.真应变为0.7时, 在1-40 ℃/s范围内, 随冷却速率增加, X80管线钢的组织依次为: 多边形铁素体、准多边形铁素体、块状铁素体、粒状贝氏体、针状铁素体(+粒状贝氏体)和板条贝氏体. 淬火组织为马氏体. X80管线钢在真应变为0.7的条件下获得针状铁素体(贝氏体铁素体)的冷却速率范围为10-20 ℃/s. 在该范围内, 冷却速率越大, 大角度晶界比例越高, 晶粒越细小.

关键词 ： X80管线钢, 相变动力学, 针状铁素体, 电子背散射衍射(EBSD), 大角度晶界(HAGB)

Abstract：

The effects of cooling rate and deformation on microstructures of an X80 pipeline steel were investigated by thermo–mechanically simulated tests heated up to the same temperature and cooled at different rates under 0 and 0.7 true strain deformation. The results reveal that the start temperature for bainite transformation will be increased by 30—80 ℃higher under 0.7 true strain than under no deformation. But the increase of cooling rate depresses the start temperature for bainite transformation and accelerates the progress of its transformation. It is found that the microstructure of the cooled samples without deformation is all composed of bainite with prior austenite grain boundaries (PAGB), but it is complicated for the cooled samples under 0.7 true strain. In the range of 1—40 ℃/s, with the increase of cooling rate, microstructures appeare successively such as polygonal ferrite, quasi–polygonal ferrite, massive ferrite, granular bainite, acicular ferrite (+ granular bainite) and athy bainite. Full martnsite steel can be acheved by quenching. Under current experiment conditions, acicular ferrite can be obtained n the steel at cooling rates of 10—20 ℃/s. In this cooing ate range, the fraction of high angle grain boundaries (HAGBs) inceases and the grain size decreases with the increase of cooling rate.

Key words： X80 pipeline steel phase transformaton kinetics cicular ferrite electron backscattering diffraction (EBSD) high ange grain boundary (HAGB)

收稿日期: 2010-01-05

基金资助:

中央高校基本科研业务费专项资金项目N090607002, 国家自然科学基金项目50474015及国家重点实验室自主课题基金项目RAL--SD--2008--2资助

作者简介: 邓伟, 男, 1983生, 博士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00005 或 https://www.ams.org.cn/CN/Y2010/V46/I8/959

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