热处理工艺对GH33A合金高温低周疲劳寿命的影响  

THE INFLUENCE OF THE DIFFERENT HEAT-TREATMENT ON THE LOW CYCLE FATIGUE LIFE FOR A SUPERALLOY GH33A

作　　者：党新安[1] 田长生[1] 张德翱[1] 

机构地区：[1]西北轻工业学院机械工程系

出　　处：《陕西科技大学学报（自然科学版）》1993年第1期53-57,共5页Journal of Shaanxi University of Science & Technology

摘　　要：本文研究了不同热处理工艺对GH33A高温合金在550℃时的低周疲劳寿命和循环变形行为的影响。结果表明,当应变范围△ε_l<1.2％时,采用双级时效工艺(B工艺)可获得最长的疲劳寿命;当应变范围△ε_l>1.2％时,采用标准热处理工艺可获得较长的疲劳寿命。热处埋工艺不同,合金的循环变形行为也不同。应根据具体构件的受力条件来制定合理的热处理工艺。以发挥合金的潜力.In this paper, the influence of the different heal-treatment on the low cyele fatigue life and behariour for a superalloy GH33A is investigated at 550℃. The result shows that at △ε_<1.2% ,the longest low cycle fatigue life is obtained when a twin-aging treatment is used; at △ε_>1.2% , the relatively long low cycle fatigue life is oblained when the standard treatment is used. The low cycle fatigue behaviour of the alloy is different for the different heat-trcatment.The reasonable heat-trcatment is laid down according to the stress condition of component, so that the potentialities of the alloy are fully brought out.

关 键 词：高温低周疲劳 显微组织 循环硬化 循环软化 

分 类 号：TG156[金属学及工艺—热处理] TG115.57[金属学及工艺—金属学]