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| Nb含量和热输入量对X80管线钢焊接粗晶区的影响 | |
| 引用本文： | 刘振伟,郭晖,尚成嘉,付彦0,王晓香,缪成亮. Nb含量和热输入量对X80管线钢焊接粗晶区的影响[J]. 材料热处理学报, 2012, 33(1): 99-105 |
| 作者姓名： | 刘振伟 郭晖 尚成嘉 付彦0 王晓香 缪成亮 |
| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083 2. 中石油渤海装备制造公司巨龙钢管厂,河北青县,062650 3. 北京科技大学材料科学与工程学院,北京100083／首钢技术研究院,北京100043 |
| 基金项目： | 国家重大基础研究项目(973计划)，国家自然科学基金重点资助项目 |
| 摘 要： | 以工业含铌X80管线钢为对象,研究了不同Nb含量条件下,焊接热影响区粗晶区中的原奥氏体晶粒和析出的状态;通过对焊接热影响区中粗晶区的热模拟实验,研究了不同热输入下,高Nb管线钢焊接粗晶区的晶粒粗化、显微组织演变、及大角晶界分布等情况。结果表明,高Nb钢的粗晶区范围更窄,粗晶区内的晶粒尺寸更小;经过双道焊的热循环后,高Nb钢粗晶区的析出尺寸更小,没有对韧性有害的大尺寸析出。此外,原奥氏体晶粒的粗化,以及显微组织中大角晶界密度的下降,明显降低了高Nb管线钢焊接粗晶区的韧性。 |
| 关 键 词： | Nb 管线钢 焊接热影响区 析出 原奥氏体晶粒 |
Effect of Nb content and heat input on coarsegrained welding heat affected zone of X80 pipeline steels |
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| MIAO Cheng-liang,LIU Zhen-wei,GUO Hui,SHANG Cheng-jia,FU Yan-hong,WANG Xiao-xiang. Effect of Nb content and heat input on coarsegrained welding heat affected zone of X80 pipeline steels[J]. Transactions of Materials and Heat Treatment, 2012, 33(1): 99-105 | |
| Authors: | MIAO Cheng-liang LIU Zhen-wei GUO Hui SHANG Cheng-jia FU Yan-hong WANG Xiao-xiang |
| Affiliation: | 1.School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083, China;2.Julong Steel Pipe Company,CNPC Bohai Petroleum Equipment Manufacturing Co Ltd,Qing County 062650,China;3.Shougang Research Institute of Technology,Beijing 100043,China) |
| Abstract: | Industrial X80 pipeline steels with different Nb content were employed to investigate the prior austenite grain and precipitation in coarse-grained welding heat affected zone.In addition,in coarse grain zone of high Nb steel,the evolution of microstructure and the density of high angle boundaries were focused by thermo-simulation tests with different heat inputs.The results indicate that the range of coarse grain zone of high Nb steel is smaller than that of medium Nb steel,therein,the grains also are finer.In intercritically reheated coarse-grained heat-affected zone of high Nb steel,the size of precipitated particles are much finer,and large particles which can worsen toughness are not found in this zone after double-welding thermal cycle.The toughness deterioration of coarse grain zone of high Nb steel can be explained by the coarsening of prior austenite grains and density decreasing of high angle boundaries. |
| Keywords: | Nb pipeline steel welding heat affected zone precipitation prior austenite grain |
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