不同冷却时间下Q690高强贝氏体钢焊接粗晶区的组织与性能
Microstructure and Properties of Welding Coarse-Grained Region of Q690 High Strength Bainite Steel at Different Cooling Times
摘 要
采用热模拟试验模拟了单道次焊接Q690高强贝氏体钢焊接粗晶区热循环过程; 研究了不同冷却时间(t8/5)下粗晶区的微观组织、冲击韧性、断口形貌和显微硬度。结果表明: 当t8/5≤10 s时粗晶区组织为板条贝氏体和粒状贝氏体, M/A岛含量较少, 且呈细小片状和粒状, 冲击韧性较高; t8/5＞10 s后粗晶区组织为粒状贝氏体, 而且M/A岛含量增加和尺寸增大, 为粗大的岛块状形貌, 粗晶区的韧性严重恶化。
贝氏体
M/A岛
冲击韧性
焊接
Q690 steel
bainite
M/A island
impact toughness
welding
Abstract
Thermal cycle process of welding coarse-grained region of Q690 high strength bainite steel under the single bead welding condition was simulated by using thermomechanical simulator. Microstructure, impact toughness, fracture morphology and microhardness of coarse grained region at different cooling times (t8/5) were studied. The results show that when t8/5≤10 s, coarse-grained region with relatively high impact toughness consisted of lath bainite and granular bainite, and fine flaky and granular M/A islands with relatively small amount were found; When t8/5＞10 s, microstructure of coarse-grained region evolved into granular bainite, the size and content of M/A islands increased obviously and changed into coarse block and island morphology, and the impact toughness was severey worsened.
中图分类号 TG457.11
所属栏目 物理模拟与数值模拟
基金项目 山东电力集团公司科学技术项目(2010A-24)
收稿日期 2011/12/21
修改稿日期 2012/8/6
网络出版日期
作者单位点击查看
备注杜宝帅(1982—), 男, 山东枣庄人, 工程师, 博士。
引用该论文: DU Bao-shuai,ZHANG Zhong-wen,XU Guo-xiang,LI Xin-mei. Microstructure and Properties of Welding Coarse-Grained Region of Q690 High Strength Bainite Steel at Different Cooling Times[J]. Materials for mechancial engineering, 2012, 36(11): 84～87
杜宝帅,张忠文,胥国祥,李新梅. 不同冷却时间下Q690高强贝氏体钢焊接粗晶区的组织与性能[J]. 机械工程材料, 2012, 36(11): 84～87
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参考文献
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【3】KRAUSS G, THOMPSON S W.Ferritic microstructures in continuously cooled low- and ultralow-carbon steels[J]. ISIJ International, 1995, 35(8):937-945.
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【6】SHI Yao-wu, HAN Zhun-xiang.Effect of weld thermal cycle on microstructure and fracture toughness of simulated heat-affected zone for a 800 MPa grade high strength low alloy steel[J]. Journal of Materials Pressing Technology, 2008, 207(1/3):30-39.
【7】史耀武, 韩准祥.工程机械用800MPa低合金高强度钢焊接热影响区断裂韧性评价[J]. 热加工工艺, 2006, 35(15):1-5.
【8】刘东升, 程丙贵, 罗咪.F460高强韧厚船板焊接热影响区的组织和冲击断裂行为[J]. 金属学报, 2011, 47(10):1233-1240.
【9】杨银辉, 柴峰, 严彪, 等.Ti处理改善船体钢焊接粗晶区的低温韧性研究[J]. 金属学报, 2010, 46(1):62-70.
【10】李亚江, 暴一品, 蒋庆磊, 等.Q690高强钢热影响区显微组织和性能研究[J]. 现代焊接, 2011, 12(6):12-14
【11】张蕾, 李亚江, 蒋庆磊, 等.液压支架用Q690+Q550高强钢焊接接头裂纹分析[J]. 焊接技术, 2010, 39(6):52-55.
【12】兰亮云, 邱春林, 赵德文, 等.低碳贝氏体钢焊接热影响区中不同亚区的组织特征与韧性[J]. 金属学报, 2011, 47(8): 1046-1054.
【13】DAVIS C L, KING J E.Cleavage initiation in the intercritically reheated coarse-grained hear-affected zone-part Ⅰ:Fractogrphic evidence[J]. Metallurgical and Materials Transactions A, 1994, 25(3):563-572.
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