| 0Cr18Ni9austenitic stainless steel is widely concerned because of theirextensively used characteristic. The solidified microstructure of0Cr18Ni9austeniticstainless typically contains a variety of complex austenite residual δferrite structurebecause of peritectic reaction and solid-state transformation.In this paper, differentialthermal analysis (DTA), vacuum unsteady solidification device of homemade,vacuum arc furnace with the type of WKDHL, coin with the circulating water, wereselected as solidification experimental equipment. The content wave of Cr elementand Ni element respectively in ferrite and austenite, the effect of cooling rate on themicrostructure and the content of residual δ ferrite were studied with themetallographic microscope, SEM, EDS test method of material, metallographicanalysis software.The content wave of Cr element and Ni element respectively in ferrite andaustenite experiments show that the fluctuation of nickel in ferrite is little and thesolute segregation isn’t serious, the fluctuation of in austenite is large and the solutesegregation is serious; the fluctuation of chromium in ferrite is large and the solutesegregation is serious, the fluctuation of in austenite is little and the solute segregationisn’t serious.The effect of cooling rate on the microstructure experiments show that with theincrease of the cooling rate, the morphology of residual δ ferrite is change greatly,ferrite morphology changed from vermicular, skeletal, reticulate, block to strip.The effect of cooling rate on the content of residual δ ferrite experiments showthat with the increase of the cooling rate, the number of residualδ ferrite is more, thelargest area of the single residualδ ferrite is larger, and the the content of the residualδ ferrite is increase. |
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