| X70钢在役焊接热循环及粗晶区组织性能研究 |
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| 引用本文： | 陈玉华,王勇,韩彬,董立先.X70钢在役焊接热循环及粗晶区组织性能研究[J].兵器材料科学与工程,2005,28(4):16-19. |
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| 作者姓名： | 陈玉华 王勇 韩彬 董立先 |
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| 作者单位： | 中国石油大学(华东)机电工程学院,材料科学与工程系,山东,东营,257061;中国石油大学(华东)机电工程学院,材料科学与工程系,山东,东营,257061;中国石油大学(华东)机电工程学院,材料科学与工程系,山东,东营,257061;中国石油大学(华东)机电工程学院,材料科学与工程系,山东,东营,257061 |
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| 基金项目： | 石油大学校科研和教改项目，国家博士生创新性研究基金，Y040312，B2005-3，， |
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| 摘 要： | 以X70管线钢为实验材料进行了在役焊接修复的研究,测定了在役焊接的热循环曲线,并与空冷焊接对比研究了粗晶区的组织和硬度。研究结果表明,在役焊接热循环曲线和常规空冷焊接有很大不同,高温停留时间和t8/5都远远小于常规空冷焊接。过快的冷却速度导致粗晶区生成了大量非平衡组织,如马氏体、板条铁素体,并使粗晶区的硬度值增大,增加了氢致裂纹敏感性。
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| 关 键 词： | 在役焊接 X70管线钢 焊接热循环 粗晶区 |
| 文章编号： | 1004-244X(2005)04-0016-04 |
| 修稿时间： | 2004年10月22日 |
Thermal cycle of in-service welding and the microstructure & property of CGHAZ of X70 pipeline steel |
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| CHEN Yu-hua,WANG Yong,HAN Bin,DONG Li-xian.Thermal cycle of in-service welding and the microstructure & property of CGHAZ of X70 pipeline steel[J].Ordnance Material Science and Engineering,2005,28(4):16-19. |
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| Authors: | CHEN Yu-hua WANG Yong HAN Bin DONG Li-xian |
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| Abstract: | In-service welding was studied using X70 pipeline steel. The thermal cycle of in-service welding was measured. The microstructure and hardness of CGHAZ were studied and compared with air cooling welding. The results of study show that the thermal cycle of in-service welding is very different from air cooling welding. The time above 1 100℃ and t85 of in-service welding are much less than air cooling welding. Much unbalanced microstructure, such as martensite and lath ferrite, produces in CGHAZ because of the too fast cooling velocity and the hardness of the CGHAZ is high, which increases the sensitivity of HIC. |
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| Keywords: | in-service welding X70 pipeline steel welding thennal cycle CGHAZ |
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