GH674高温合金的热变形行为  

Hot Compressive Deformation Behavior of Superalloy GH674

作　　者：李佃国[1] 尹法杰[2] 李长荣[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院高温材料研究所,北京100081

出　　处：《金属热处理》2005年第8期5-7,共3页Heat Treatment of Metals

摘　　要：采用Gleeble-1500热模拟机对GH674高温合金在应变速率为0.01s-1～1.0s-1、变形温度为950℃～1200℃、真应变为1的条件下的热变形行为进行了研究.结果表明,在试验研究的变形条件下,GH674型高温合金在热压缩变形过程中发生明显的动态再结晶;用Zener-Hollomon参数的指数函数能较好地描述该合金高温变形时的流变行为;所获得的峰值应力热变形方程为σp＝21.3139ln+9.580495×105/Τ-538.11638;其热变形激活能Q为373.7102803kJ/mol.The hot compressive deformation behaviour of superalloy GH674 was investigated in the temperature range from 950℃ to 1200℃ and at strain rate range from 0. 01s^-1 to 1.0s^-1 on Gleeble-1500 hot simulator. The experimental results show that the dynamic recrystallization occurs during hot compressive deformation of superalloy GH674,the flow behaviour of superalloy GH674 during hot deformation can be represented by a Zener-Hollomon parameter in the exponent style equation, the regressed expression is σp = 21.31391nε ＋ 9. 580495 × 10^5/T- 538.11638. The hot deformation activation energy of superalloy GH674 during hot deformation is 373. 7102803kJ/mol.

关 键 词：GH674高温合金 热压缩变形 流变应力 Zener—Hollomon参数 热变形激活能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]