作　　者： ; ; ; ;

机构地区： 东北大学材料与治金学院材料各向异性与织构工程教育部重点实验室

出　　处： 《钢铁研究学报》 2011年第S2期96-99,共4页

摘　　要： 研究采用J积分方法研究了GH690合金在饱和氢水浴条件下不同载荷速率的断裂韧性,探讨了载荷速率对断裂行为的影响机制。研究发现,当载荷速率低于0.07 mm/min时,饱和氢水中GH690合金的断裂韧性随载荷速率的降低而下降。低载荷速率下,水浴中的氢以Cottrell氢气团的形式随位错迁移到裂纹尖端,并在晶界碳化物处富集,降低晶界碳化物与基体界面之间的结合强度,导致合金的断裂韧性降低。 The fracture toughness and fracture behavior of GH690 alloy were investigated by means the J-integral method in the saturated-hydrogen water bath with different loading velocities. The results show that the fracture toughness is decreased with the decreasing of loading velocity if the loading velocity is lower than 0.07 mm/min. When loading velocity is lower than 0.07 mm/min, the hydrogen can move to the crack tip with mobile dislocations in form of Cottrell gas mass and accumulate in the carbide at the grain boundary, leads to the reduction of bonding strength between the grain boundary carbides and the matrix, results in the decreases of fracture toughness.

关 键 词： 核电材料 合金 断裂韧性 氢脆

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]