加温超载处理对提高30CrMnSiA钢构件裂纹扩展寿命的作用  

Effects of Heat-Overloading Treatment On Crack Extension Life of 30CrMnSiA Components

作　　者：况森保 

出　　处：《南昌航空工业学院学报》1995年第2期62-66,共5页Journal of Nanchang Institute of Aeronautical Technology（Natural Science Edition）

摘　　要：对带裂纹的３０ＣｒＭｎｓｉＡ钢紧凑拉伸试件进行同时加温超载处理，经卸载冷却后，在裂纹尖端区产生残余压应力塑性场。这一处理方法起到延缓裂纹扩展、抑制起裂的效果。实验结果表明：在相同应力水平下，经同时加温超载处理的试样的疲劳断裂总寿命比其他两种处理方法的试样的疲劳断裂总寿命分别提高２．４和３．３倍以上。同时加温超载处理法也可以推广应用于其他金属塑性材料的构件，也将产生同样良好的效果。In this paper,the crack - borne tensile specimens made from 30CrMnSiA are firstly heated and overloaded and then unloaded and cooled. Around the tip of the crack will form a residual plastic field with compressive stresses. This treatment has an effect on delaying the crack extension and hence suppressing its cracking. Compared to other two treatment, this method will increase the fatigue fracture life by a factor of 2. 4～3. 3. Furthermore, this treatment can also be used on the components made from other metallic plastic materials

关 键 词：铬锰钢 加热 过载荷 疲劳裂纹 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG113.255[金属学及工艺—金属材料]