Effect of W and Ti on Microstructure and Hot Deformation Behavior of GH3539 Alloy AITranslate

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Chinese Library Classification Number:TG132.32[一般工业技术—材料科学与工程]

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GH3539 alloy ingots with different W contents(26%,30%,and 35%by mass)and Ti contents(0,0.5%,and 1.2%by mass)were prepared in a vacuum induction melting furnace and subjected to ho-mogenization heat treatment.The microstructure of the alloy was characterized using scanning electron microscope(SEM),energy dispersive spectrometer(EDS),electron probe microanalyzer(EPMA)and electron backscatter diffraction technique(EBSD).The influence of Ti and W elements on the hot deformation behavior of GH3539 alloy was studied by isothermal compression tests at a temperature of 1200℃,strain rates of 0.01~1 s^-1,and a strain of 50%.The results indicate that as the content of Ti and W increases in the GH3539 alloy,the number of granular precipitates in theγmatrix of the alloy also increases gradually.Increasing the content of Ti element raises the volume fraction of Ti-rich MC carbides in the alloy,significantly reducing the deformation resistance and markedly improving the hot workability of the alloy.Additionally,the addition of Ti also reduces the recrystallized grain size of the hot-deformed alloy and increases its recrystallization volume fraction.Increasing the content of W element promotes the precipitation of M₆C carbides andα-W particle phase.When 35%W is added,a large number of blockyα-W phase wrapped by M₆C carbides precipitates in the homogenized heat-treated alloy.Although this W-rich particulate phase promotes the dynamic recrystallization of the matrix to a certain extent,it also readily becomes crack sources during high-temperature deformation,thus deteriorating the hot workability of the alloy.