| 焊接热输入对Q890高强钢热影响区裂纹扩展的影响 |
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| 引用本文： | 崔 冰,彭 云,彭梦都,江卓俊.焊接热输入对Q890高强钢热影响区裂纹扩展的影响[J].焊接学报,2017,38(8):63-67. |
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| 作者姓名： | 崔 冰 彭 云 彭梦都 江卓俊 |
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| 作者单位： | 1. 安徽工业大学 材料科学与工程学院,马鞍山 243000;钢铁研究总院 先进钢铁流程 及材料国家重点实验室,北京 100081;2. 钢铁研究总院 先进钢铁流程 及材料国家重点实验室,北京,100081 |
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| 基金项目： | 国家自然科学基金资助项目，国家国际科技合作专项资助项目 |
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| 摘 要： | 采用Gleeble1500热模拟试验机，研究不同热输入对Q890高强钢焊接热影响区粗晶区的微观组织和韧性影响规律. 结果表明,随着热输入的增加,粗晶区的微观组织表现出从马氏体组织向马氏体、贝氏体的混合组织,再向贝氏体、粒状贝氏体的混合组织的转变. 当热输入为19.7 kJ/cm时,冲击吸收功最高为83 J,主要原因是由于先相贝氏体分割后相马氏体,大角度晶界密度最大,改善了冲击韧性. 当热输入较高时,粗晶区脆化的原因是由于M-A组元呈链状分布,造成局部应力集中,成为裂纹起裂和扩展的主要通道.
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| 关 键 词： | 组织演变 M-A组元 大小角晶界 裂纹扩展 冲击韧性 |
| 收稿时间： | 2015/6/17 0:00:00 |
Effect of heat input on crack growth behavior of CGHAZ of Q890 high-performance steel |
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| CUI Bing,PENG Yun,PENG Mengdu,JIANG Zhuojun.Effect of heat input on crack growth behavior of CGHAZ of Q890 high-performance steel[J].Transactions of The China Welding Institution,2017,38(8):63-67. |
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| Authors: | CUI Bing PENG Yun PENG Mengdu JIANG Zhuojun |
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| Abstract: | The present study focuses on the relationship between microstructure and toughness property in the coarse grain heat affected zone (CGHAZ) of Q890 high-performance steel. The result show that, with the heat input increasing microstructure changes from martensite to martensite and bainitic ferrite and then to bainitic ferrite and granular bainite. The Charpy impact test results show that impact energy as high as 83 J attained in the CGHAZ with 19.7 kJ/cm, which related to the contribution of pre phase bainitic ferrite segment martensite and leading to maximum density of high angle boundaries, which can improve toughness. When the heat input is 34.1 and 44 kJ/cm, the impact energy reasons for the decline is due to catenulate distribution of embrittlement M-A constituents and local stress concentration, resulting in rapid crack initiation and propagation via the massive martensite–austenite (M-A) constituent. |
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| Keywords: | microstructure variation M-A constituents high angle grain boundaries crack propagation impact toughness |
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