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在断裂失效过程中,主要的断裂失效形式是疲劳断裂失效,其次是环境断裂失效及沿晶断裂失效;除此之外的断裂失效的形式均称之为其他断裂失效。其他断裂失效的形式也包含着很多类型,本文不可能一一列举,主要是结合几个生产实际中的实例进行简述。 1 冷轧钢辊剥落失效实例冷轧钢辊材料为9Cr2Mo钢,经整体淬火,140℃回火处理,在使用过程中发现沿表面产生剥落失效现象,其断口宏观形貌特征如图10-1所示,具有明显的放射状条纹和层状条纹,放射状条纹的收敛处为裂源,外观呈现暗褐色;另外一部分为快速剥落即撕裂区,它具有金属光泽,呈灰色特征。另外,冷轧辊外表面较粗糙,应用显微镜可观察到有微小的裂纹,裂纹形态呈现断续状;根据裂纹的
In the process of failure, the main fault failure modes are fatigue failure, followed by environmental failure and intergranular fracture failure; other failure failure forms are called other failure faults. Other forms of fracture failure also include many types, this article can not be enumerated one by one, mainly in combination with several examples of actual production briefly. A cold-rolled steel roller spalling failure Example Cold-rolled steel roller material 9Cr2Mo steel, the overall quenching, tempering at 140 ℃, the use of the process was found along the surface spalling failure phenomenon, the fracture macro-morphological features shown in Figure 10-1 Shows obvious radial stripes and stratified stripes. Radial stripes converge on the cracked source and appear dark brown in appearance. The other part is a rapid tearing or tearing zone, which has a metallic luster and is characterized by gray. In addition, the rough outer surface of the cold roll, microscopic microscopic cracks can be observed, the shape of cracks showed discontinuous; according to the crack