论文部分内容阅读
Ni基超合金的高温能力在过去的50年中已提高了300℃以上,并且正在向1100℃的目标前进,如已经合理地设计出由fcc和Cl_2相组成显微组织的单晶超合金。但是除了这些努力以外,可以明确地说要大幅度提高超合金的温度能力是越来越困难,因为Ni的熔点是相当低(1453℃)。考虑到具有更高温度能力的材料在高级燃气轮机上的应用始终在不断地增加,所以寻找新的合金来取代Ni—基超合金是非常重要的。开发具有超过Ni基超合金高温能力的新合金目前正在进行,如用共格的Ni_3AlTi沉淀强化的NiAl基合金,W—基Hfc弥散硬化
The high temperature capability of Ni-based superalloys has risen by more than 300 ° C over the past 50 years and is moving towards the 1100 ° C target. For example, single crystal superalloys composed of fcc and Cl_2 phases have been reasonably designed. But beyond these efforts, it can be stated that it is increasingly difficult to significantly raise the temperature capability of superalloys because the melting point of Ni is rather low (1453 ° C). It is important to find new alloys to replace Ni-based superalloys, given the ever-increasing use of materials with higher temperature capabilities in advanced gas turbines. The development of new alloys with high temperature capability over Ni-based superalloys is currently underway, such as the use of NiAl-based alloys strengthened with a coherent Ni_3AlTi precipitate, W-based Hfc dispersion hardening