研究目的
Studying the structural-phase state and mechanical properties of the synthesized heat-resistant and refractory VZh159 alloy for parts of the combustion chamber, including the determination of mechanical characteristics and the study of structural features of the synthesized material after long-term (500 h) exposures at high temperatures.
研究成果
The segregation of dispersed particles of the σ phase after the gas-static treatment followed by aging and after prolonged exposure at high temperatures does not have a significant negative effect on the plastic and strength characteristics of the alloy. The long-term strength of the synthesized metal after the 500-h exposure at a temperature of 900°C corresponds to the certified values for the deformed semifinished product of the VZh159 alloy.
研究不足
The study is limited to the VZh159 alloy and its behavior under specific thermal exposures and HIP treatments. The findings may not be directly applicable to other alloys or under different conditions.
1：Experimental Design and Method Selection
The study involves the evolution of the structural-phase state of the VZh159 alloy fabricated by selective laser melting after various types of thermal exposure and hot isostatic pressing (HIP). The effect of a long 500-h exposure at temperatures of 800 and 900°C on the phase composition and morphology of structural components is determined.
2：Sample Selection and Data Sources
A heat-resistant nickel deformable VZh159 alloy with a high heat resistance was selected for the study. A powder was prepared from the alloy preforms by sputtering the melt with an argon flow in a facility.
3：List of Experimental Equipment and Materials
The SLM process of the powder was carried out in facilities with and without heating of the build platform in a nitrogen environment. The microstructure was studied on JSM 6480LV JEOL and Hitachi SU8100 scanning electron microscopes, as well as by TEM on a Tecnai G2 F20 S-TWIN TMP microscope with an accelerating voltage of 200 kV.
4：Experimental Procedures and Operational Workflow
Sample bars were prepared parallel (XY) and perpendicular (Z) to the plane of the formation of the material layers. The samples were subjected to HIP and aging according to the temperature modes developed at the All-Russian Scientific Research Institute of Aviation Materials.
5：Data Analysis Methods
The X-ray phase analysis was carried out on monolithic samples in the state immediately after SLM and HIP-1. Residual stresses were determined in the longitudinal and perpendicular directions (with respect to the direction of the sample synthesis).
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