MP159合金热加工工艺参数研究

通过对Ｔｈｅｒｍｅｃｍａｓｔｅｒ－Ｚ型热加工模拟试验机上等温恒应变速率压缩试验结果分析，首次提出了钴基高温合金ＭＰ１５９的热加工工艺参数范围。

MP159合金热变形加热规范研究

研究了加热温度、升温速度、保温时间对MP159合金组织、硬度的影响，为制定MP159合金热变形加热规范提供了理论依据。

Thermal stability of cold worked microstructure of MP159 alloy

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 1?070?℃ 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 platelets will not dissolve.

GH159合金48%冷变形下组织和性能的研究

对GH159合金经 48± 1%冷变形量下的组织及经不同固溶温度、不同固溶时间处理后的透射电子显微组织 ,以及时效后的性能进行了较为深入的研究。结果表明 ,G159合金经 48± 1%冷拔变形后形成了大量密排六方的网状ε 相。这些ε 相经过 10 3 0～ 10 90℃× 4～ 8小时空冷固溶处理后 ,部分ε 相转化为弥散球形γ′ 相。GH159合金冷拔态 (48± 1% ) + 665℃× 4小时空冷时效后 ,70 0℃下具有高的强度。

Hardening mechanism of MP159 alloy induced by aging

The microstructural changes of both solution heat treated (ST) and cold worked (CW) MP159 alloy during aging were investigated by optical microscopy and transmission electron microscopy (TEM). The results indicate that both solution heat treated (ST) and cold worked (CW) MP159 alloy could be hardened by aging. This aging induced hardening is attributable to the precipitation of a very finely dispersed ordered cubic γ′ phase particles with only several nanometres in diameter. The hexagonal close packed (HCP) ε martensite precipitated during aging of both CW MP159 and CW MP35N, and the hexagonal ordered Co 3Mo phase of the DO 19 structure type precipitated during aging of CW MP35N, have not been found in the present investigation.

合成电子衍射花样的计算机模拟及应用

开发了用于计算和绘制ｆｃｃ基体与孪晶及ｆｃｃ基体与密排六方。马氏体（ｈｃｐ）之间两相合成电子衍射花样的计算机程序．利用该程序模拟了ＭＰ１５９合金大量低指数基体取向合成电子衍射花样模拟结果表明，能准确区分李晶和ｈｃｐ相的可靠基体取向为（０１１），（５２１）和（４１１），其中以（０１１）取向为最佳根据可靠某作取向，利用透射电子显微镜研究ＴＭＰ１５９合金冷变形组织中的相组成结果表明，固溶状态下的ｆｃｃ单相组织在冷变形时形成的呈网络分布的片状组织为含有高密度堆垛层错的形变孪晶；除了一些分布在堆垛层错中的ｈＣＰ单元外。