抗大变形管线钢焊接粗晶区的组织和韧性*

doi:10.11901/1005.3093.2015.307

材料研究学报

2016, Vol. 30

Issue (7): 517-523 DOI: 10.11901/1005.3093.2015.307

本期目录 | 过刊浏览

抗大变形管线钢焊接粗晶区的组织和韧性*

贾书君¹(

), 王远方², 谭峰亮³, 刘清友¹

1. 钢铁研究总院工程用钢研究所北京 100081
2. 中国石油辽河油田分公司钻采工艺研究院盘锦 124010
3. 昆明理工大学冶金与能源工程学院昆明 650093

Microstructure and Toughness of Heat-affected Zone of Weld Joint for Pipeline Steels with High Deformability

JIA Shujun^1,^**(

), WANG Yuanfang², TAN Fengliang³, LIU Qingyou¹

1. China Iron & Steel Research Institute, Beijing 100081, China
2. Liaohe Oilfield Company, China National Petroleum Corporation, Panjin 124010, China
3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

引用本文:

贾书君, 王远方, 谭峰亮, 刘清友. 抗大变形管线钢焊接粗晶区的组织和韧性*[J]. 材料研究学报, 2016, 30(7): 517-523.
Shujun JIA, Yuanfang WANG, Fengliang TAN, Qingyou LIU. Microstructure and Toughness of Heat-affected Zone of Weld Joint for Pipeline Steels with High Deformability[J]. Chinese Journal of Materials Research, 2016, 30(7): 517-523.

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摘要:

采用Gleeble-3800模拟研究了抗大变形管线钢中不同Nb含量和不同热输入时的焊接热循环过程, 并通过光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)及冲击载荷试验等研究了抗大变形管线钢焊接粗晶区(CGHAZ)的微观组织特征和冲击韧性。结果表明: 随着热输入量的增加显微组织逐渐从板条贝氏体到粒状贝氏体过渡, M/A尺寸增大, 比例提高, 同时显微组织的平均有效晶粒尺寸也增大; 在热输入相同的条件下, 高Nb钢中原始奥氏体细化明显, 组织中M/A尺寸细小, 分布更加弥散; 随着焊接热输入量的增加实验钢的冲击韧性急剧降低, 高Nb钢的韧性急剧降低的热输入临界值约为35 kJ/cm, 低Nb钢韧性降低的热输入临界值约为25 kJ/cm, 在整个实验参数范围内, 高Nb钢的冲击韧性值明显比低Nb实验钢的高。

关键词 ：金属材料, 抗大变形管线钢, 焊接粗晶区, 热输入量, 晶粒尺寸, M/A岛, 冲击韧性

Abstract：

Welding thermal cycle process of test steels containing different Nb was investigated under different heat inputs with a Gleeble-3800 thermo-mechanical simulator. The microstructural characteristics of the coarse-grained heat-affected zone (CGHAZ) were observed by using optical microscope (OM), scanning electron microscope (SEM) and electron backscatter diffraction (EBSD), while their impact toughness was tested. The results indicate that with the increasing heat input, lath bainite transformed gradually into granular bainite, and the size and proportion of M/A islands increased, while the average grain size also increased. Under the same heat input, austenite in high Nb steel was refined obviously, with more dispersive and refined M/A islands distributed in the microstructure of high Nb steel, and the proportion of high angle boundaries was high. With the increasing heat input, the impact toughness of steels decreased sharply. The critical heat input value for a sharp decrease in impact toughness were approximately 35 kJ/cm for high Nb steel and 25 kJ/cm for low Nb steel. However, the impact toughness of the high Nb steel was significantly higher than that of the lower Nb steel in the range of experimental parameters.

Key words： metallic materials high-deformability pipeline steel CGHAZ heat input grain size M/A islands toughness

收稿日期: 2015-08-13

基金资助:* 国家高技术研究发展计划资助2013AA09A219资助项目

作者简介: null

本文联系人: 贾书君

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表1 实验钢板的化学成分

表2 实验钢板原始力学性能

图1 原始钢板的显微组织形貌

图2 焊接热模拟工艺图

图3 热输入量对实验钢焊接粗晶区显微硬度和冲击韧性的影响

表3 t8/3时间对应的不同热输入量

图4 两实验钢在热输入为16 kJ/cm时的奥氏体晶粒尺寸

图5 两种实验钢在不同热输入量条件下的显微组织(a)~(c) A钢; (d)~(f) B钢

图6 实验钢在16 kJ/cm条件下的扫描电镜照片

图7 B钢在热输入为16 kJ/cm条件下的TEM照片

图8 B钢不同热输入条件下的SEM照片

图9 B钢在不同热输入下焊接粗晶区的大晶界分布、取向成像图(黑线为大角度晶界>15°)及反极图例

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