| WEL-TEN780A高强钢及焊接接头疲劳裂纹扩展速率 |
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| 引用本文： | 周志良,谢明,林文群,刘琦.WEL-TEN780A高强钢及焊接接头疲劳裂纹扩展速率[J].大连交通大学学报,1999,20(3):1. |
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| 作者姓名： | 周志良 谢明 林文群 刘琦 |
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| 作者单位： | 1. 大连铁道学院材料,科学与工程系,辽宁,大连116028
2. 齐齐哈尔车辆厂,黑龙江,齐齐哈尔,161000 |
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| 摘 要： | 依据GB6398-86,采用紧凑拉伸试样(CT),对WEL-TEN780A钢及其用L-80SN焊条手工电弧焊焊接接头的焊缝和热影响区的疲劳裂纹扩展速率进行了研究.结果表明在相同的疲劳循环载荷作用,热影响区疲劳裂纹扩展速率高于母材和焊缝,焊缝金属具有最低裂纹扩展速率.焊缝金属中的针状铁素体细小且被大角度晶界所分割,疲劳裂纹扩展时要消耗更大的能量,从而降低裂纹扩展速率,成为止裂型焊缝.
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| 关 键 词： | 疲劳裂纹 扩展速率 高强钢 焊缝 热影响区 |
| 修稿时间： | :1999-04-1 |
Fatigue Crack Propagation Rates of the WEL-TEN 780A Steel and Weldment |
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| ZHOU Zhi-liang,XIE Ming,LIN Wen-jun,LIU Qi.Fatigue Crack Propagation Rates of the WEL-TEN 780A Steel and Weldment[J].Journal of Dalian Jiaotong University,1999,20(3):1. |
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| Authors: | ZHOU Zhi-liang XIE Ming LIN Wen-jun LIU Qi |
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| Abstract: | According to GB6398-86 standard,the fatigue
crack propagation rates of WEL-TEN 780A steel and weldment were investigated using CT
specimens.The weldment was made using manual metal arc welding with L-80SN electrodes.The
testing results show that the fatigue crack propagation rate is the highest for HAZ
specimens and the lowest for the weld metal.Microstructure of the weld metal consists
mainly of acicular ferrite which gives high resistance to crack propagation.Therefore,weld
metal is very tough and has good property against fatigue crack propagation. |
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