理化检验-物理分册2013，Vol.49Issue(8)：510-515,6.
K444铸造高温合金的高温蠕变性能
High Temperature Creep Properties of K444 Cast Superalloy
张立新 1孙奇 1田野 1王铄1
作者信息
- 1. 中航工业黎明航空发动机有限公司技术中心理化所,沈阳110043
- 折叠
摘要
Abstract
The high temperature tensile creep behavior of a new type of cast nickel base superalloy K444 under the condition of 850～950 ℃/225～380 MPa was studied.The results show that the microstructure of K444 alloy was mainly composed of γ'phase,γ'/γ' eutectic,carbides,nitrogen and boride.γ' phase in heat treated sample had spherical and elliptical two forms.The γ' particles started rafting in the end of deceleration period,and then interacted with the dislocation.Creep curves of K444 alloy had shorter initial stage and long acceleration stage,which resulted by the rafting of γ' particles and the interaction of the dislocations.The accelerated creep should be strain softening stage,and it can be described by the formula of ε·=ε·min (1+c'Δε)exp(n'Δε).The creep rupture data complied with Monkman-Grant rules,and the void cracks originated from the boundary or branch grain boundary.关键词
镍基高温合金/高温蠕变/蠕变断裂Key words
nickel based superalloy/ high temperature creep/ creep fracture分类
矿业与冶金引用本文复制引用
张立新,孙奇,田野,王铄..K444铸造高温合金的高温蠕变性能[J].理化检验-物理分册,2013,49(8):510-515,6.
