| 九江大桥15MnVNq-C钢焊接过热区的低温韧性 |
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| 引用本文： | 孙静涛,周昭伟,林青. 九江大桥15MnVNq-C钢焊接过热区的低温韧性[J]. 焊接学报, 1994, 15(4): 228-234 |
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| 作者姓名： | 孙静涛 周昭伟 林青 |
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| 作者单位： | 哈尔滨焊接研究所,哈尔滨焊接研究所,哈尔滨焊接研究所 |
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| 摘 要： | １５ＭｎＶＮｑ－Ｃ钢为九江长江大桥主要用钢，其过热区低温韧性较优化前１５ＭｎＶＮｑ－Ａ钢有大幅度改善，为分析１５ＭｎＶＮｑ－Ｃ钢焊接过热区低温韧性改善的原因，本文采用热模拟技术对比研究了过热区组织及其对韧性的影响，过热区Ｖ（Ｃ，Ｎ），Ｔｉ（Ｃ，Ｎ）的析出行为及其析出相对组织和韧性的影响，结果指出，含微量Ｔｉ（０．０１２％）的１５ＭｎＶＮｑ－Ｃ钢过热区低温韧性的改善与难溶的ＴｉＮ析出相粒子有关。由于
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| 关 键 词： | 过热区 低温韧性 锰钢 焊接 桥梁工程 |
| 收稿时间： | 1994-09-06 |
Low-temperaturc toughness of overheated zone in weld of 15MnVNq-C steel used for Jiujiang Bridge |
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| Sun Jingtao,Zhou Zhaowei and Lin Qing. Low-temperaturc toughness of overheated zone in weld of 15MnVNq-C steel used for Jiujiang Bridge[J]. Transactions of The China Welding Institution, 1994, 15(4): 228-234 |
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| Authors: | Sun Jingtao Zhou Zhaowei Lin Qing |
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| Affiliation: | Harbin Research Institute of Welding,Harbin Research Institute of Welding and Harbin Research Institute of Welding |
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| Abstract: | 15MnVNq-C steel was used in Jiujiang Bridge over Yangzi River. It was greatly improved as compared with previous l5MnVNq-A steel in low-temperature toughness of overheated zone. Factors leading to the improvement of the toughness in the overheated zone of 15MnVNq-C steel were analyzed by using thermal simulating technique. Behaviour of V(C, N), Ti(C, N) precipitated pliase and its effect on microstructure and toughness in overheated zone were investigated. The results obtained are as follows. Improvement of the toughness in overheated zone of 15MnVNq-C steel was connected with insoluble TiN precipitated phase. Because of the existence of trace Ti in 15MnVNq-C steel, solution nitrogen content was reduced and tougher aciculai ferrite was formed in the overheated zone, therefore, the low-temperature toughness was improved. |
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| Keywords: | 15MnVNq steel overhealed zone low-temperature toughness |
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