长期时效对FGH97合金γ'相演化的影响  

Influence of long-term aging treatment on γ′ phase evolution in FGH97 P/M alloy

作　　者：张丽娜[1] 王璞[1,2] 董建新[1] 张麦仓[1] 郑磊[1] 张义文[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]安泰科技股份有限公司,北京100081 [3]钢铁研究总院高温材料研究院,北京100081

出　　处：《材料热处理学报》2012年第12期30-35,共6页Transactions of Materials and Heat Treatment

摘　　要：采用场发射电镜观察了FGH97合金经过不同时效温度和时效时间后不同形态γ'相的演化规律。结果表明:不同温度下一次γ'相和二次γ'相平均尺寸随时效时间的增加存在最大值,三次γ'相平均尺寸随时效时间延长呈线性增长;550℃时效后二次γ'相由立方形长大为不规则形,分裂成为田字花瓣形或蝶形,而后沿<100>方向分解为小立方形;在750℃时效后期,二次γ'相出现边界融合现象,且小三次γ'相消失。时效后硬度值的变化与γ'相尺寸有关。The γ′ phase evolution in FGH97 P/M alloy after aging at different temperatures for different time was observed by FESEM. The results show that the sizes of primary γ′ phase and seeondary γ′ phase exist maximum values with increasing aging time at different temperatures. The average sizes of tertiary γ′ phase increases linearly with increasing aging time. The euboidal seeondary γ′ phase grows irregularly and changes to the shape of four-leaf clover or butterfly, then breaks up into small cube along 〈 100 〉 at 550 ℃. But the boundary of second γ′ phase becomes merged and the tertiary γ′ phase becomes vanished at 750 ℃. The hardness relates to the size of precipitated phase.

关 键 词：FGH97合金 长期时效 析出相 

分 类 号：TG156.92[金属学及工艺—热处理] TF125.4[金属学及工艺—金属学]