基于I_1断裂准则的铁素体型钢焊接氢致开裂机制研究  

Research on Hydrogen Induced Cracking Mechanism of Ferritic Steel in Welding Process Based on I_1 Fracture Criterion

作　　者：薛钢[1] 王涛[1] 杨超飞[1] 牛佳佳[1] 牛继承[1] XUE Gang;WANG Tao;YANG Chaofei;NIU Jiajia;NIU Jicheng(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2018年第4期49-52,共4页Development and Application of Materials

摘　　要：基于I_1断裂准则,提出了铁素体型钢焊接氢致开裂机制,即材料内部局部氢气压、焊接内应力、外载荷作用叠加形成的应力第一不变量I_1值达到材料的断裂强度I_b时发生开裂。两种材料的焊接充氢拉伸试验验证了氢致开裂机制。Based on I1 fracture criterion,hydrogen induced cracking mechanism of ferritic steel in welding process is proposed.Material begins to fracture when first stress invariant I1 taken shape by hydrogen pressure,interior stress and applied load reaches fracture strength Ib. The hydrogen induced cracking mechanism was verified by hydrogen charging tensile test of two materials.

关 键 词：断裂准则 致开裂机制 焊接 

分 类 号：TG407[金属学及工艺—焊接]