一种细晶铸造镍基高温合金的组织与力学性能

金属学报, 2014, 50(7): 839-844. doi: 10.3724/SP.J.1037.2013.00745

一种细晶铸造镍基高温合金的组织与力学性能

杨金侠 ^1, , 孙元 ^2, , 金涛 ^3, , 孙晓峰 ^4, , 胡壮麒 ^5,

1.中国科学院金属研究所,沈阳110016

2.中国科学院金属研究所,沈阳110016

3.中国科学院金属研究所,沈阳110016

4.中国科学院金属研究所,沈阳110016

5.中国科学院金属研究所,沈阳110016

关键词：镍基高温合金 , 细化剂 , 持久性能 , 高周疲劳性能

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-BASED SUPERALLOY WITH REFINED GRAINS

Keywords： Ni-based superalloy , refiner , stress-rupture property , high cycle fatigue property

通过传统铸造方法和细晶铸造工艺制备一种铸造镍基高温合金的6种不同形态与尺寸的晶粒.结果表明,细晶铸造工艺制备的样品心部为0.5 mm左右的等轴晶,外部为柱状晶.相比传统铸造方法,细晶铸造工艺获得的晶粒较为细小.y'相和碳化物随晶粒尺寸减小而变得细小.室温拉伸性能和550℃下高周疲劳性能随晶粒尺寸降低而提高;在760℃和应力662MPa条件下,合金的持久性能随晶粒尺寸减小而增加;但在982℃和应力186MPa条件下,合金的持久性能随之降低.细化晶粒提高了合金的中、低温力学性能,但对其高温力学性能不利.

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一种细晶铸造镍基高温合金的组织与力学性能

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A Ni-BASED SUPERALLOY WITH REFINED GRAINS

参考文献