Ni-Cr-Co合金相含量分布及其对高温拉伸性能的影响

Phase Amount Distribution and its Effects on High Temperature Tensile Properties of a Ni-Cr-Co Superalloy

研究了一种 Ni- Cr- Co合金经 115 0℃× 1.7h固溶和 80 0℃× 80 MPa应力时效 (8,10 0 ,5 0 0 ,10 0 0 h)及无应力时效 (10 0 ,5 0 0 ,10 0 0 h)后相含量分布的特点及其对高温拉伸性能的影响。结果表明 ,随着时效时间的延长 ,应力时效试样中晶界碳化物的含量递减而无应力时效试样中晶界碳化物的含量递增 ,晶界与晶内的碳化物含量均呈反向变化趋势 ;晶内γ′相含量均呈先增后减趋势 ;无应力时效试样 780℃拉伸强度随晶界碳化物含量的增加而下降 ,应力时效的则相反。

The Characteristics of phase amount distribution and their effects on high temperature tensile properties were determined on the samples of a Ni Cr Co base superalloy treated by solid solution of 1150℃/1 7h, and then followed by a unstress ageing treatment (8, 100, 500 and 1000h) and a stress aging treatment (100, 500 and 1000h), respectively With the increase of aging time, the following results were obtained The carbide amount at grain boundaries was decreased for the stress aged samples and increased for the unstress aged samples, respectively The carbide amount at grain boundaries and in the grain interiors exhibited an opposite varying tendency The amount of γ′ phase in the grain interiors was increased when samples were aged for a shorter period of time, and then decreased The 780℃ tensile strength was decreased with the increase of the carbide amount at grain boundaries for the unstress aged samples and the opposite was true for the stress aged samples The analysis and discussions were made for the above results in the paper