Q345钢断裂韧性和裂纹扩展速率研究  

Study on Fracture Toughness and Fatigue Crack Growth Rate of Steel Q345

作　　者：李红英[1] 张希旺[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2007年第24期49-51,共3页Hot Working Technology

摘　　要：分别对Q345钢J积分值和裂纹扩展速率进行了测定。测定了其J_R曲线:lnJ=5.75+0.67ln△α,J_(1c)= 184.5 kJ/m^2;疲劳裂纹扩展速率方程为da/dN=3.25x10^(-12)(△k)~4。分析了显微组织对断裂韧性和裂纹扩展速率的影响,并用扫描电镜对断口进行了观察。The fracture toughness and fatigue crack growth rate of Q345 steel were studied. The fracture toughness of Q345 steel was measured by J integral, J1c =184.5kJ/m^2, resistant curve of Q345 steel is lnJ=5.75＋ 0.671nΔα; The equation of fatigue crack growth rate is da/dN=3.25×10^-12（Δk）^4. Moreover, the effects of the microstructure on fracture toughness and fatigue crack growth rate were analyzed, and the fi-acture morphology was observed by SEM.

关 键 词：Q345钢 断裂韧性 疲劳裂纹 扩展速率 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TG142.12[金属学及工艺—金属材料]