关键词: 2%硼不锈钢304B7, 硼化物, 固溶处理, 力学性能;

Abstract: In order to improve the mechanical properties of 2% Boron 304B7 stainless steel, charge rule of solution treatment after different heat treatment process of 304B7 stainless steel containing boron on the component, microstructure, distribution of borides and mechanical property of 304B7 stainless steel have been studied and analyzed. The results show that two phase compositions of borides are Cr2B and ( FeCr)2B,as-cast state, the borides are distributed in a network shape, and in the rolled state, the borides are distributed in a strip shape along the rolling direction. The borides have good thermal stability, and the amount of borides changes is little after high temperature solution treatment. But at 1 150 °C for 1 h water cooling it is the suitable heat treatment system of 304B7 stainless steel, the borides precipitated by the solution treatment have smaller size and dispersed distribution, and the overall mechanical properties of the material are relatively good, that are impact energy 10.4 J, yield strength 348 MPa, and tensile strength 659 MPa.

Key words: ">2% Boron Stainless Steel 304B7, Boride, Solution Treatment, Mechanical Property