晶粒度对Ni_3Al基MX246AG合金铸态组织及性能的影响  

Effect of Grain Size on Microstructure and Performance of Ni_3Al-Based Superalloy MX246AG

作　　者：沈鸿[1] 骆合力[1] 李尚平[1] 王建涛[1] 吴泊成[1] 赵记兰 

机构地区：[1]钢铁研究总院高温材料研究所,北京100081

出　　处：《铸造》2016年第10期960-962,969,共4页Foundry

摘　　要：研究了不同晶粒度下MX246AG合金组织及性能的变化。结果表明,随着晶粒度的减小,枝晶干γ′相尺寸随之减小,并且MCⅡ型碳化物由块状逐渐变为点条状。晶粒度等级从M6级提高至M11级后,合金850℃低周疲劳寿命显著提高了4.7倍,且合金的室温拉伸强度提高,850℃的伸长率明显增大。The microstructure and performance of MX246AG alloy with different grain sizes were studied. The result shows that with the grain size decreasing, secondary γ＇ phase size decreased, while MCⅡ, carbide changed from block-like into trip-like. With decreasing grain size from M6 to M11, the low cycle fatigue life increased 4.7 times, the room temperature tensile strength was enhanced and the 850℃ tensile elongation increased.

关 键 词：NI3AL 高温合金 细晶 力学性能 疲劳性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]