加氢反应器用2.25Cr-1Mo-0.25V钢锻件的持久性能

Endurance property of 2.25Cr-1Mo-0.25V steel forgings for hydrogenation reactor

研究了高温持久对2.25Cr-1Mo-0.25V钢断口及显微组织的影响。对热处理态试样的常温、高温及相同温度、不同载荷下的高温持久强度进行分析,并通过扫描电镜(SEM)对持久试样的断口及微观组织进行观察。结果表明,随着加载应力的增加,持久时间显著降低,持久试样断裂后,断口形貌的韧窝中有富Mo析出相,且随着持久断裂时间的延长,析出相中Mo元素含量逐渐增多。

Effects of high temperature endurance on fracture and microstructure of 2.25Cr-1Mo-0.25V steel were researched.Normal temperature tensile strength,high temperature tensile strength and high-temperature endurance strength under same temperature and different loading of the as-heat treated specimens were analyzed.The fracture and microstructure of the specimens were observed by means of scanning electron microscope(SEM).The results show that with the increase of the loading stress,the endurance time decreases significantly.After fracture,rich-Mo phases are precipitated in the fracture,and with the increase of the fracture time,the content of Mo in the precipitated phase increases gradually.