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任何合金,特别是高温合金(铁基和镍基),由于加入大量合金元素,故凝固温度较宽,在合金凝固过程中不可避免地要产生疏松、特别是显微疏松。这些铸造缺陷对合金的机械性能—室温和高温机械性能,特别是高温疲劳性能影响很大,对其铸件的水密性影响也很大。用HIP(热等静压)工艺,可以使所研究的合金(K-11和208合金)在高温高压下产生高温蠕变扩散过程,使大部份显微疏松闭合,故高温持久断裂寿命提高一个数量级;水压试验(19MPa)不出汗。试验表明,HIP工艺是一种能使铸件致密化和均匀化,提高机械性能的工艺方法。
Any alloy, especially the high-temperature alloys (iron-based and nickel-based), due to the addition of a large number of alloying elements, so the solidification temperature is wide, the alloy solidification process inevitably have to loose, especially microscopic loose. These casting defects on the mechanical properties of alloys - room temperature and high temperature mechanical properties, especially high-temperature fatigue properties of great impact on the watertightness of its castings are also great. With HIP (Hot Isostatic Pressing), the studied alloys (K-11 and 208 alloy) can creep and diffuse under high temperature and high pressure to make most of them microscopically loose and closed, so the long-term high-temperature rupture life is improved An order of magnitude; hydrostatic test (19 MPa) does not sweat. Tests show that, HIP process is a casting can make the densification and homogenization, improve the mechanical properties of the process.