Thermal stability of cold worked
microstructure of MP159 alloy
microstructure of MP159 alloy
(1. Department of Materials Science and Engineering,
Nanchang Institute of Aeronautical Technology, Nanchang 330034, China;
2. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
Nanchang Institute of Aeronautical Technology, Nanchang 330034, China;
2. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
Abstract: In order to know the longest permissible thermal exposure time during which the cold worked (CW) microstructure would remain unchanged, the effect of the thermal exposure at temperatures ranging from 910℃ to 1070℃ on the microstructure was investigated for MP159 alloy by optical microscopy and transmission electron microscopy (TEM). Such a study can provide guidance for determining reasonable hot forging parameters of fasteners. The results indicate that the intersecting network of fine platelets in CW microstructure are thermal stable when thermal exposure temperature does not exceed 920℃. When thermal exposure temperature exceed 920℃, the intersecting network of fine platelets will dissolve, but the thermal exposure temperature has the longest permissible thermal exposure time during which the intersecting network of fine plate lets will not dissolve.
Key words: thermal stability; cold work; MP159 alloy; exposure; intesecting network