【摘要】 对比了不同热处理工艺下1Cr17Ni2钢U、V形缺口试样夏比冲击试验的冲击吸收功、断口形貌和断面纤维率。结果表明在本试验热处理条件下,U形试样AKU2值符合国标要求,但V形试样AKV2值低,二者之间没有确切对应关系;断口形貌分析表明断口中的纤维状断面为韧性断口特征,结晶状断面为解理断裂与沿晶断裂混合的脆性断口特征;U形缺口试样断口的断面纤维率比V形缺口试样高。V形缺口试样更能反映出1Cr17Ni钢的脆性开裂倾向,当1Cr17Ni2钢的服役环境对冲击性能要求较高时用AKV2值评定其韧脆性更加可靠。更多还原

【Abstract】 Charpy impact performance of U-shaped and V-shaped notch 1Cr17Ni2 samples after different heat treatments was studied based on the analysis of impact absorbing energy,fracture morphology and area percentage of fibrous fracture. It is found that the AKU2 values of U-shaped samples meet the requirement of standard but the AKV2 values of V-shaped samples are very low. There is no corresponding relations between AKU2 and AKV2. Fracture morphology analysis indicates that fibrous fractures are characterized with ductile fracture,while crystal fractures are composed of cleavage fracture and intergranular fracture. The area percentages of fibrous for U-shaped notch samples are higher than those of V-shaped notch samples,suggesting the impact test of V-shaped notch samples can evaluate the brittleness tendency of 1Cr17 Ni steel more distinctively. It is therefore reliable AKV2 values by using V-shaped specimen is recommended to judge toughness when a high impact property of 1Cr17 Ni steel is required in service environment.更多还原