论文部分内容阅读
The effect of high temperature solution heat treatment on the microstructure and ten- sile property, of as-cast 0Gr17Mnl4Mo2N duplex stainless steel was investigated. It was found that the morphology of Jδ-ferrite in the dual phases microstructures changed gradually from dendritic to lamellar and then to spheroidal, and its distribution be- came more uniform under appropriate treatment. When the treat temperature was lower than 1.250℃, the spheroidial ratio and the homogeneous distribution of δ-ferrite increase with increasing temperature, which corresponds to a better tensile property. In addition, when the treat temperature reached 1250℃ and above, the microstructure consists of coarse equiaxial δ-ferrite grains with the needle austenite at its boundaries, which results in a decrease of the tensile properties of the steel.
The effect of high temperature solution heat treatment on the microstructure and ten- sile property, of as-cast 0Gr17Mnl4Mo2N duplex stainless steel was investigated. It was found that the morphology of Jδ-ferrite in the dual phases microstructures changed gradually from dendritic to lamellar and then to spheroidal, and its distribution be-came more uniform under appropriate treatment. When the treat temperature was lower than 1.250 ° C, the spheroidial ratio and the homogeneous distribution of δ-ferrite increase with increasing temperature, which corresponds to a better tensile property. In addition, when the treat temperature reached 1250 ° C and above, the microstructure consists of coarse equiaxial δ-ferrite grains with the needle austenite at its boundaries, which results in a decrease of the tensile properties of the steel.