Effect of hot isostatic pressing technology on structure and properties of products made of VZh159 heat-temperature alloy

The hot isostatic pressing (HIP) technology is considered on the example of making of compacts made of VZh159 powder. It is shown that powders with fractional composition of –70 +25 µm, bulk density of 3.77 g/cm3 , fl uidity of 2.3 g/s, specifi c surface of 446 cm2 /g, and average Fischer particle size of 16 µm are prone to sorbed gases. Gases on the surface of the powder body as result of the HIP cycle can form non-metallic inclusions that reduce the properties of the compact. To effectively remove gases, vacuum heat treatment is used: degassing. It is established that the structure of HIP-compacts after two- or four-stage ageing has fi ner grain (point 9) compared to the cast alloy (point 7).The mechanical properties of the compacts obtained made of VZh159 power exceed the correspointing requirements of the standard process documentation for ultimate strength by 21...22 % and elongation by 36...45 %.