中文摘要：

结合一起22Cr2Ni4MoVA钢制水晶釜爆炸事故,通过理化试验得到了使用8年后釜体材质劣化情况,即22Cr2Ni4MoVA钢的屈服强度和强度极限虽基本不变,但反映材料韧性的指标如冲击功、断面收缩率和断裂韧性都普遍大幅度下降,存在严重的脆化和蠕变变形.同时,利用结构有限元法计算了水晶釜底部危险区域的应力分布和变形,指出22Cr2Ni4MoVA钢在人造水晶生长环境下的损伤机理为蠕变、疲劳和腐蚀交互作用下的脆性断裂.

英文摘要：

Combined with an explosion accident of a 22Cr2Ni4MoVA steel crystal vessel,the degradation of the body material used 8 years were investigated by physical and chemical experiments in the present work.The experimental results showed that yield strength and ultimate strength of the 22Cr2Ni4MoVA steel were nearly unchanged whilst the material toughness indexes（e.g.,impact energy,section-shrinkage rate and the fracture toughness） decreased greatly and the material has severe embrittlement and creep deformation.The stress distribution and deformation in dangerous zone at the bottom crystal vessel were analyzed by finite element method.It was demonstrated that the damage mechanism of 22Cr2Ni4MoVA steel in artificial crystal growing environment was a brittle fracture under the interaction of creep,fatigue and corrosion.