一种新型Ni-Fe基高温合金的微观组织和力学性能的研究
Investigation on the Microstructure and Mechanical Properties of a New Ni-Fe Based Superalloy
刘从庆 1肖旋 1刘庆丰 1姜壹夫1
作者信息
- 1. 沈阳理工大学材料科学与工程学院,辽宁沈阳110159
- 折叠
摘要
通过硼、磷微合金化对Ni-Fe基高温合金GH984进行改性,利用光学显微镜、扫描电镜和透射电镜观察添加硼、磷的GH984高温合金的微观组织,进一步研究硼、磷对合金的拉伸和持久性能的影响.结果表明:硼、磷的微合金化几乎不影响GH984合金的微观组织,合金主要由γ基体、γ’相、Ti(C,N)、MC型和M23C6型碳化物组成;硼、磷的加入对合金的室温拉伸性能和700℃拉伸强度影响极小,但能成倍提高合金的高温拉伸塑性;持久寿命随硼、磷的添加显著提高,持久组织观察表明,硼、磷的添加有效阻碍了晶界碳化物的粗化,使其呈块状非连续弥散分布,提高了合金的持久强度.
Abstract
A new Ni-Fe based superalloy was fabricated by adding trace B and P in GH984 alloy.Its microstructure was observed by combination of optical microscope,scanning electron microscope and transmission electron microscope and the tensile and creep properties were investigated as well.The results showed that trace addition of B and P has no obvious effect on the microstructure of GH984 alloy,which has the precipitates of spherical γ',Ti (C,N),blocky MC as well as discrete M23C6 distributing along grain boundary.Moreover,the tensile strength at RT and 700℃ keep the same level as before.However,tensile ductility at 700℃ increases rapidly after B and P addition.It is worth to note that B and P microslloying can improve the stress rupture life of the alloy significantly.For example,the rupture life at the condition of 700℃ and 350MPa increases from initial 115.0 h to 984.2 h.Investigation on the crept microstucture exhibited that B and P microalloy could effectively prevent the growth of carbide on grain boundary and therefore improve the creep strength.
关键词
Ni-Fe基高温合金/GH984/微合金化/微观组织/力学性能Key words
Ni-Fe base superalloy, GH984/micro-alloying/microstructure/mechanical property引用本文复制引用
出版年
2014
NETL
NSTL
维普
万方数据