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| 热循环对Q890钢焊接热影响不同区域组织及性能的影响 | |
| 引用本文： | 崔 冰,彭 云,彭梦都,肖红军. 热循环对Q890钢焊接热影响不同区域组织及性能的影响[J]. 焊接学报, 2017, 38(7): 35-39. DOI: 10.12073/j.hjxb.20150427004 |
| 作者姓名： | 崔 冰 彭 云 彭梦都 肖红军 |
| 摘 要： | 采用热模拟技术和冲击试验研究经不同峰值温度热循环后Q890钢焊接热影响区的粗晶区、细晶区、不完全相变区和临界粗晶区的组织和韧性的变化规律.结果表明，细晶区冲击吸收功高达222.7 J，具有良好的冲击韧性;而粗晶区、临界区及临界粗晶区冲击吸收功分别为低至56、35.7和16.3 J；分析认为临界区和临界粗晶区中M-A组元主要沿晶界分布造成晶界弱化，晶界处应力集中形成微裂纹，降低其冲击韧性.细晶区中由于原奥氏体晶粒细化，并且大角度晶界取向角θ，在15°<θ<45°范围内的百分比最高为25.7%，能够提高冲击韧性. |
| 关 键 词： | 高强钢 焊接热循环 相变 冲击韧性 |
| 收稿时间： | 2015-04-27 |
Effects of weld thermal cycle on microstructure and properties of heat affected zone of Q890 processed steel |
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| CUI Bing,PENG Yun,PENG Mengdu,AN Tongbang. Effects of weld thermal cycle on microstructure and properties of heat affected zone of Q890 processed steel[J]. Transactions of The China Welding Institution, 2017, 38(7): 35-39. DOI: 10.12073/j.hjxb.20150427004 | |
| Authors: | CUI Bing PENG Yun PENG Mengdu AN Tongbang |
| Abstract: | By using thermal simulation technology and impact test to study Q890 steel microstructure and properties of each HAZ peak at different temperature conditions. The results show that the simulated welding thermal cycling conditions were experienced coarse grain heated affected zone (CGHAZ), fine grain heated affected zone (FGHAZ), intercritial grain heated affected(IGHAZ) zone and intercritial reheated coarse grain heated affected zone(ICCGHAZ). Impact test results show that the impact toughness of FGHAZ up to 222.7 J; and the ICCGHAZ toughness is the lowest 16.3 J. Analysis concluded that the lower value of charpy impact energy observed in the ICCGHAZ and ICGHAZ is due to the formation of martensite austenite constituent along the grain boundaries, and formation concentrated stress and micro cracks, leading to its relatively lower impact energy. Additionally， the FGHAZ since the original austenite grain refinement, and high angle grain boundaries orientation θ, in 15°<θ<45° range has the highest percentage is 257% which can improve the impact toughness of the region. |
| Keywords: | high strength steel welding thermal cycle phase transition impact toughness |
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