摘要
以34CrNiMo6、25Cr2MoV为对象,研究了两种材料自室温至-100℃温度范围内的力学性能及断裂机制。结果表明两种金属材料的断裂韧性则随温度的降低而降低;屈服强度、抗拉强度则随温度的降低而升高。断面收缩率、延伸率以及缺口敏感系数均未出现明显降低的现象。由于试验材料塑性很好产生缺口强化效应,使得缺口材料的抗拉强度高于光滑试样。从微观机制上看,随着温度的降低,材料的微观断口形貌由韧窝状逐步转化为准解理。
This paper studied mechanical properties of 34CrNiMo6 and 25Cr2MoV.The test temperature was from room temperature to-100℃.The results show that,as the temperature dropped,the fracture toughness of the two materials decreased too.At low temperature the yield strength and tensile strength of the metallic materials increased greatly.The elongation A,cross -section Z and notch sensitive coefficient qe haven＇t significantly changed.Due to the notch strengthening effect,their RmH were much higher than Rm.While from the micro-mechanism point of view,the fracture mophology changed from dimple to quasi-cleavage as the temperature decreased.
出处
《低温与超导》
CAS
北大核心
2013年第11期23-27,共5页
Cryogenics and Superconductivity
关键词
低温
断裂韧性
断口形貌
Low temperature
Fracture toughness
Fracture morphology
