Tensile Properties and Phase Precipitation of K423A Alloy at High Temperature

In this paper, K423A alloy was subjected to high temperature tensile test using a metal material universal testing machine. The microstructure of the alloy was observed by scanning electron microscopy. The precipitation phase of the alloy was analyzed by phase diagram calculation software and XRD analysis. The results show that the tensile strength and yield strength of the alloy decrease with the increase of temperature in the range of 700–950 °C. The elongation increases first and then decreases, and the highest value occurs at 900 °C. The main strengthening phase of the alloy is found to be γ′ phase, and MC, M6C, M23C6, μ phase, σ phase and boride are precipitated during the solidification process.