摘要
阐述了TMCP型F460厚板的生产方法,并使用自动埋弧焊技术对60 mm厚钢板进行双面多层多道次对接焊试验。分析了母板及焊接接头的显微组织,检测了母板及焊接接头的常规力学性能和-10℃下焊接接头的裂纹尖端张开位移(CTOD)性能。结果表明,采用低碳多元微合金化成分设计,配合适当TMCP工艺,使得试制钢板具有良好的组织与力学性能;热输入量为15k J/cm时焊接热影响粗晶区组织主要为板条状贝氏体,热输入量为50 k J/cm时粒状贝氏体增多,大角度晶界减少;焊接接头拉伸断裂位置位于母材,焊缝区显微硬度明显高于母材,未出现焊接软化和粗晶区脆化现象;热输入量为15和50 k J/cm时,熔敷金属和热影响粗晶区的(-10℃) CTOD平均值分别大于0. 623和0. 833 mm,焊接接头具有优良的低温抗开裂性能。
The production methods of thermomechanically controlled process(TMCP)type F460 heavy plate were described.60 mm-thick F460 plates were welded by multi-pass butt welded using automatic submerged arc welding machine.The microstructures of welded joints and plates were analyzed,and their mechanical properties and the crack tip opening displacement(CTOD)at-10℃were also tested.The results showed that excellent combination of microstructure and mechanical properties was achieved for the tested plate by low carbon and multivariate microalloying combining with TMCP process.When the heat input energy(E)was 15 kJ/cm,the microstructure of coarse-grained heat-affected zone(CGHAZ)was mainly lath-like bainite.When the E value was 50 kJ/cm,granular bainite formed and increased,and the amount of high-angle grain boundaries decreased.The tensile fracture position of the welded joint was in the base metal.The microhardness of the weld metal was higher than that of base metal.Softening and embrittlement did not take place in the welded joint.When the E value were 15 and 50 kJ/cm,the average CTOD value at-10℃of weld metal and CGHAZ was greater than 0.623 and 0.833 mm,respectively.The welded joint also had excellent low temperature resistance to cracking.
作者
武凤娟
程丙贵
刘东升
曲锦波
Wu Fengjuan;Cheng Binggui;Liu Dongsheng;Qu Jinbo(Institute of Research of Iron and Steel,Shasteel,Zhangjiagang Jiangsu 215625,China)
出处
《上海金属》
CAS
北大核心
2018年第5期21-27,共7页
Shanghai Metals
关键词
F460厚板
焊接接头
组织
性能
裂纹尖端张开位移
F460 heavy plate
welded joint
microstructure
mechanical property
crack tip opening displacement(CTOD)
