| Zr对高强度钢热影响区第二相粒子及韧性影响 |
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| 引用本文： | 沈毓,万响亮,刘昱,李光强,吴开明.Zr对高强度钢热影响区第二相粒子及韧性影响[J].焊接学报,2019,40(8):55-62. |
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| 作者姓名： | 沈毓 万响亮 刘昱 李光强 吴开明 |
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| 作者单位： | 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉,430081;武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉 430081;省部共建耐火材料与冶金国家重点实验室,武汉 430081;省部共建耐火材料与冶金国家重点实验室,武汉,430081 |
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| 基金项目： | 中国博士后科学基金资助项目（2014M550414）；国家自然科学基金青年基金资助项目（51501134） |
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| 摘 要： | 研究了0.012 4%锆对低合金高强度钢焊接热影响区粗晶区第二相粒子和冲击韧性的影响.结果表明，模拟20 kJ/cm焊接线能量下无锆钢焊接热影响区粗晶区中第二相粒子为Al-Ti复合氧化物和（Ti，Nb） N析出物.而含锆钢则是Zr-Al-Ti复合氧化物及（Al，Ti，Nb） N和（Ti，Nb） N析出物.同时，定量数据分析表明含锆钢中氧化物和氮化物粒子密度更高且尺寸更加细小.这些高密度的细小的第二相粒子在焊接过程中能有效钉扎晶界移动，抑制奥氏体晶粒粗化，在焊接热影响区粗晶区中得到尺寸相对细小均匀的原奥氏体晶粒，使得含锆钢焊接热影响区粗晶区呈现韧性断裂和极好的低温冲击韧性.
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| 关 键 词： | 低合金高强度钢 热影响区 锆 第二相粒子 韧性 |
| 收稿时间： | 2017/9/5 0:00:00 |
Effect of Zr on second-phase particle and impact toughness in the heat-affected zone of high-strength steel |
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| SHEN Yu,WAN Xiangliang,LIU Yu,LI Guangqiang and WU Kaiming.Effect of Zr on second-phase particle and impact toughness in the heat-affected zone of high-strength steel[J].Transactions of The China Welding Institution,2019,40(8):55-62. |
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| Authors: | SHEN Yu WAN Xiangliang LIU Yu LI Guangqiang and WU Kaiming |
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| Affiliation: | 1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology Wuhan, 430081, China2.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology Wuhan, 430081, China;The State Key Laboratory of Refractories and Metallurgy, Wuhan, 430081, China3.The State Key Laboratory of Refractories and Metallurgy, Wuhan, 430081, China |
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| Abstract: | The effect of 0.012 4% Zr addition on second-phase particle and impact toughness in the simulated coarse-grained heat-affected zone (CGHAZ) of high-strength low-alloy steel was investigated. Results shown that second phase particles were Al-Ti composite oxides and (Ti, Nb)N precipitates in the CGHAZ of Zr-free steel, whereas, Zr-Al-Ti composite oxides and (Al, Ti, Nb)N and (Ti, Nb)N precipitates were obtained in Zr-bearing steel under the simulation with 20 kJ/cm input welding thermal cycles. Quantitative data analysis revealed that the oxides and nitrides in Zr-bearing steel had higher density and were finer than that in Zr-free steel. These high density fine second phase particles effectively pinned the grain boundary movement in the welding process and inhibited austenite grain coarsening. Small and uniform austenite grains were obtained in the CGHAZ in Zr-bearing steel. Thus, the CGHAZ in Zr-bearing steel exhibited ductile fracture and excellent low temperature impact toughness. |
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| Keywords: | HSLA steel CGHAZ Zr second-phase particles toughness |
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