| 焊接二次热循环对T23钢粗晶区再热裂纹敏感性的影响 |
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| 引用本文： | 王田田,徐孟嘉,徐济进,余春,陆皓.焊接二次热循环对T23钢粗晶区再热裂纹敏感性的影响[J].材料导报,2017,31(12):56-59. |
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| 作者姓名： | 王田田 徐孟嘉 徐济进 余春 陆皓 |
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| 作者单位： | 1. 上海交通大学材料科学与工程学院,上海,200240;2. 上海电机学院机械学院,上海,201306 |
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| 基金项目： | 国家自然科学基金(51575347) |
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| 摘 要： | 利用Gleeble-3500热力模拟试验机制备T23钢焊接接头中粗晶热影响区和不同二次热循环的再热粗晶热影响区,并进行STF(Strain-to-fracture)试验。结果表明,粗晶区经历1 350℃或780℃二次热循环后,仍保持粗晶热影响区的粗大晶粒、笔直的晶界形貌以及高再热裂纹敏感性,断面收缩率低于5%。粗晶区经历了880℃、950℃或1 100℃二次热循环后,晶粒尺寸变小,晶界变曲折,断面收缩率分别为24.67%、16.6%和7.24%,再热裂纹敏感性降低。因此,合理调控二次热循环的峰值温度在A_(c1)~A_(c3)之间可以有效降低再热裂纹敏感性。
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| 关 键 词： | T23钢 粗晶区 焊接二次热循环 再热裂纹 |
Influence of Second Welding Thermal Cycle on Reheat Cracking Sensitivity of CGHAZ in T23 Steel |
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| WANG Tiantian,XU Mengji,XU Jijin,YU Chun and LU Hao.Influence of Second Welding Thermal Cycle on Reheat Cracking Sensitivity of CGHAZ in T23 Steel[J].Materials Review,2017,31(12):56-59. |
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| Authors: | WANG Tiantian XU Mengji XU Jijin YU Chun and LU Hao |
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| Affiliation: | School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240,School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306,School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240,School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240 and School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240 |
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| Abstract: | The coarse-grained heat-affected zone (CGHAZ) and reheat coarse-grained heat-affected zone (reheat CGHAZ) experienced different second thermal cycle of T23 steel were produced by a Gleeble-3500 thermo-mechanical simulator,and then strain to fracture (STF) tests were carried out.Results showed that CGHAZ experienced thermal cycle of 1 350 ℃ or 780 ℃ still had coarse grain,straight grain boundary configuration and high reheat cracking sensitivity,with a reduction of area of lower than 5 ％.CGHAZ experienced thermal cycle of 880 ℃,950 ℃ or 1 100 ℃ had smaller grain size,zigzag grain boundary and low reheat cracking sensitivity,and the reductions of area were 24.67％,16.6％ and 7.24％ respectively.Controlling the peak temperature of the second welding thermal cycle to the range of Ac1-Ac3 can reduce reheat cracking sensitivity. |
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| Keywords: | T23 steel CGHAZ second welding thermal cycle reheat cracking |
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