热处理工艺对GH33A合金高温低周疲劳寿命的影响  

On Effect of Heat Treatment on Low Cycle Fatigue Properties of Superalloy GH33A at 550℃

作　　者：田长生[1] 党新安[1] 

机构地区：[1]西北工业大学

出　　处：《西北工业大学学报》1993年第3期305-309,共5页Journal of Northwestern Polytechnical University

摘　　要：本文研究了不同热处理工艺对GH33A高温合金在550℃下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_t<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_t≥1.2％时,采用标准热处理工艺可获得较长的疲劳寿命.热处理工艺不同,合金的循环变形行为则不同.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.P.R.C. improved on Russian Superalloy 4376 to obtain GH33A superalloy. GH33A lacks as yet the high temperature low cycle fatigue properties under standard heat treatment and it also lacks detailed data concerning effect of heat treatment on its properties. To fill in this gap is the aim of this paper. Fatigue tests are performed on electrohydraulic low cycle fatigue testing machine called SHIM ADZU EA-10 and made in Japan. Test temperature is 550℃. Air is used as heating medium. Straining is so controlled that strain changes at constant speed(4 × 10^(-3) s^(-1)) from maximum strain to minimum strain and vice versa. The maximum strain is equal to the absolute value of minimum strain, i.e R=-1, Four values of total strain △ε_t, (or twice the maximum strain) are taken: 0.0075,0.009,0.012 and 0.015. The test results indicate: (1) When △ε_t<0.012, longest fatigue life is obtained by employing B regime, which is two-stage aging heat treatment; (2) When △ε_t> 0.012, longest fatigue life is obtained by employing standard heat treatment; (3) Cyclic curve exhibits strain hardening for B regime.

关 键 词：热处理 低周疲劳 耐热合金 高温 

分 类 号：TG166[金属学及工艺—热处理]