基于组织的DH36钢焊缝微观应力应变模拟研究  

Microstress and Microstrain Simulation of DH36 Steel Weld Based on Microstructure

作　　者：王炳英 李丽莎 秦志 黄鹏 邹钰琨 温志刚[2] 龚宝明[3] WANG Bingying;LI Lisha;QIN Zhi;HUANG Peng;ZOU Yukun;WEN Zhigang;GONG Baoming(School of Materials Science and Engineering,China University of Petroleum,Qingdao 266580,Shandong,China;Offshore Petroleum Engineering(Qingdao)Co.,Ltd.,Qingdao 266520,Shandong,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,山东青岛266580 [2]海洋石油工程(青岛)有限公司,山东青岛266520 [3]天津大学材料科学与工程学院,天津300350

出　　处：《材料导报》2023年第21期196-200,共5页Materials Reports

基　　金：山东省自然科学基金(ZR2019MEE108)。

摘　　要：通过试验观察和数值模拟手段,揭示了海洋平台结构用钢DH36多层多道焊缝中典型区域的微观组织分布形态等对焊缝力学性能的影响,采用仪器化压痕法研究不同焊缝组织的断裂性能,对比微区组织对启裂、变形性能的影响。研究发现,在针状铁素体和晶界铁素体混合组织中,弹塑性变形不协调,产生应力应变集中,其中应力集中发生于针状铁素体,应变集中出现在晶界铁素体并向针状铁素体延伸,晶界铁素体条状分布的强度高于晶界铁素体网状分布的强度。The influences of microstructure distribution and morphology in typical areas on the mechanical properties of the multi-layer multi-pass welds are researched in this paper,with the base material chosen DH36,steel for offshore platform structures.Experimental tests utilizing instrumented indentation systems and corresponding numerical simulations are employed to investigate different fracture properties(including crack ini-tiation and material deformation behaviors)from different microstructure characteristics of the weld zone.The results show that stress and strain concentration conditions occur in the mixture of acicular ferrite(AF)and grain boundary ferrite(GBF)due to the inconsistent elastic-plastic deformation behavior,with the stress concentration existing in the AF and the strain concentration in the GBF extending to the AF.In addition,the stripe distribution of GBF leads to a better joint strength than the network distribution.

关 键 词：微观组织不均匀性 纳米压痕 有限元模拟 应变集中 

分 类 号：TG456.7[金属学及工艺—焊接]