Effect of aging treatment on the microstructure and properties of GH4099 alloy formed by selective laser melting
In this study,the high temperature tensile properties of GH4099 alloy formed by selective laser melt-ing under different heat treatment conditions were studied,and the reasons for the difference in mechanical prop-erties were analyzed by observing the microstructure. The results show that after solution treatment at 1 150 ℃ for 1.5 h and aging at different temperatures at 800,850,900 ℃ for 8 h,the grains of the alloy are equiaxed to varying degrees. With the increase of aging temperature,the high temperature tensile strength of GH4099 alloy decreases gradually and the plasticity increases gradually. By observing the microstructure,it is found that the content and size of y ' phase and the content of the twin are different when the aging temperature is different,which leads to the difference of high temperature tensile properties.
selective laser meltingGH4099heat treatmentprecipitatetensile properties at 900 ℃
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