高强度海工钢断裂行为与板厚相关性分析  

Relationship Analysis on Fracture Behavior and Thickness of High Strength Marine Steels

作　　者：牛佳佳 高珍鹏 薛钢[1] 宫旭辉[1] NIU Jiajia;GAO Zhenpeng;XUE Gang;GONG Xuhui(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

出　　处：《材料开发与应用》2019年第4期4-8,共5页Development and Application of Materials

基　　金：国家重点研发计划项目(2016YFB0300604)

摘　　要：采用裂纹尖端张开位移(CTOD)试验对177.8mm厚的A517GrQ高强度齿条钢开展了沿厚度方向不同取样位置、不同试样厚度条件下的断裂韧性分析.结果表明:钢板沿厚度方向不同位置的断裂行为差异明显,同一温度下的CTOD特征值从表面至中心位置逐渐降低;随着试样厚度的增加,钢板的CTOD特征值先增加而后缓慢下降,其相关性满足关系式:δm=0.095t0.5e-0.009t1.17+0.65(1-e-0009t1.17).The fracture toughness of A517 GrQ steel plate was studied by using crack-tip opening displacement (CTOD) test. Different steel plate thicknesses, test temperatures and sampling locations along the thickness direction were selected in the tests. The results showed that the CTOD values of A517 GrQ steel decreased gradually from the surface to the core under the same temperature. With the increasing of specimen thickness(t), the CTOD eigenvalue(δm) of A517 GrQ steel increased first and then decreased slowly. It's suggested that the relationship formula of t and δm could be proposed as δm=0.095t0.5e-0.009t1.17+0.65(1-e-0009t1.17).

关 键 词：A517 GrQ钢 裂纹尖端张开位移 厚度 

分 类 号：TB302[一般工业技术—材料科学与工程]