[1]谷 雨,姜韶华,徐 海,等.X80管线钢CGHAZ连续冷却组织转变规律及力学性能研究[J].焊管,2021,44(6):13-17.[doi:10.19291/j.cnki.1001-3938.2021.06.003]
　GU Yu,JIANG Shaohua,XU Hai,et al.Continuous Cooling Transformation Behavior in the Weld Coarse Grained Heat Affected Zone and Mechanical Properties of X80 Pipeline Steel[J].,2021,44(6):13-17.[doi:10.19291/j.cnki.1001-3938.2021.06.003]
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X80管线钢CGHAZ连续冷却组织转变规律及力学性能研究()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
第44卷
期数:
2021年第6期
页码:
13-17
栏目:
试验与研究
出版日期:
2021-06-28

文章信息/Info

Title:
Continuous Cooling Transformation Behavior in the Weld Coarse Grained Heat Affected Zone and Mechanical Properties of X80 Pipeline Steel
文章编号:
10.19291/j.cnki.1001-3938.2021.06.003
作者:
谷 雨; 姜韶华; 徐 海; 罗刘敏; 许彩云; 刘晓青; 劳晓东
1. 周口师范学院 机械与电气工程学院，河南 周口466000；
2. 潍坊职业学院，山东 潍坊 262737；
3. 渤海装备钢管销售公司，河北 青县 062658
Author(s):
GU Yu;  JIANG Shaohua;  XU Hai;  LUO Liumin;  XU Caiyun;  LIU Xiaoqing;  LAO Xiaodong
1. School of Mechanical and Electrical Engineering, Zhoukou Normal University, Zhoukou 466000, Henan, China;
2. Weifang Vocational College, Weifang 262737, Shandong, China;
3. CNPC BEM Steel Pipe Sales Company, Qingxian 062658, Hebei, China
关键词:
X80管线钢; 粗晶热影响区; CCT曲线; 冷却速度; 力学性能
Keywords:
X80 pipeline steel;  coarse grained heat affected zone;  CCT curves;  cooling rate;  mechanical properties
分类号:
TG113
DOI:
10.19291/j.cnki.1001-3938.2021.06.003
文献标志码:
A
摘要:
为了研究X80管线钢粗晶热影响区（CGHAZ）连续冷却行为对其组织和性能的影响，进行了热模拟试验，并通过显微组织观察、显微硬度测试、低温冲击试验等方法对X80管线钢CGHAZ连续冷却行为及力学性能进行了研究。结果显示，CGHAZ在低冷速时，组织为准多边形铁素体（QF）+粒状贝氏体（GB），冷却速度在20 ℃/s时为GB+贝氏体铁素体（BF），原奥氏体晶粒尺寸（PAGS）随冷却速度增大而减小；硬度随冷却速度升高而增大，并且获得安全硬度（350HV）的冷却速度为72 ℃/s；冲击韧性随冷却速度升高而增大，但是冷却速度超过80 ℃/s或者低于20 ℃/s时，冲击韧性开始降低。最后，根据试验结果确定了X80管线钢CGHAZ的CCT曲线。
Abstract:
In order to study the effect of continuous cooling behavior of CGHAZ of X80 pipeline steel on its microstructure and mechanical properties, thermal simulation test was carried out. The continuous cooling behavior and mechanical properties of CGHAZ were studied by means of microstructure observation, microhardness test and low temperature impact test. The results show that the microstructure of CGHAZ is quasipolygonal ferrite (QF) + granular bainite (GB) at low cooling rate and GB + bainite ferrite (BF) at 20 ℃/s. The original austenite grain size (PAGS) decreases with the increase of cooling rate. The hardness increases with the increase of cooling speed, and the cooling speed of safety hardness (350HV) is 72 ℃/s. The impact toughness increases with the increase of cooling rate, but when the cooling rate exceeds 80 ℃/s or the cooling rate is lower than 20 ℃/s, the impact toughness begins to decrease. Finally, the CCT curve of X80 pipeline steel CGHAZ is determined according to the test results.

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备注/Memo

备注/Memo:
收稿日期：2021-03-15
基金项目： 国家自然科学基金“高强海底管线环焊缝的疲劳裂纹萌生扩展及断裂行为研究”（项目编号52001340）；河南省高等学校青年骨干教师培养计划“磨矿过程多源信息融合软测量方法研究”（项目编号2020GGJS216）；河南省高等学校重点科研项目“SnPb焊料的重金属浸出规律与迁移”（项目编号20A430035）。
作者简介：谷 雨（1967—），女，博士，周口师范学院讲师，主要从事机械专业课程教学和高强管线钢焊接性能研究工作。
更新日期/Last Update: 2021-07-02