长期时效过程中FGH97合金γ′相演化规律  

Effect of Long Time Aging Treatment on the γ' Phase Evolution of FGH97 P/M Supperalloy

作　　者：王璞[1,2] 董建新[2] 张义文[3] 

机构地区：[1]安泰科技股份有限公司,北京101318 [2]北京科技大学,北京100083 [3]钢铁研究总院,北京100081

出　　处：《稀有金属材料与工程》2014年第5期1111-1116,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50771011)

摘　　要：采用场发射电镜观察不同温度和时间时效后FGH97合金的显微组织,总结3种不同尺寸γ'相的演化规律。结果表明:不同温度下,随时效时间增加,一次γ'相和二次γ'相平均尺寸均存在最大值,三次γ'相平均尺寸均呈线性增长。550℃时效后二次γ'相分裂明显,由立方形长大为不规则形,分裂成田字花瓣形或蝶形,而后分解为小立方形,沿一定方向排列。而750℃时效后期,二次γ'相出现边界融合现象,且小三次γ'相聚集长大。γ'相尺寸变化导致时效后硬度值的变化。Microstructure of FGH97 P/M superalloy after long aging was observed by FESEM, the evolution of the various-size γ′ phaseaged at different temperatures and for different time were concluded. The average sizes of prime γ′ phase and second γ′ phase havemaximum values with increasing of aging time at different temperatures, while the average sizes of tertiary γ′ phase increase linearly withaging time. The morphology of second γ′ phase changes from small cube to butterfly and it cracks into square along specific orientation at550 ℃. But the boundary of second γ′ phase becomes merged and the tertiary γ′ phase become aggregated at 750 ℃. The hardness isrelated to the precipitated phase size.

关 键 词：FGH97合金 长期时效 析出相 平均尺寸 形貌 

分 类 号：TG132.3[一般工业技术—材料科学与工程]