热处理工艺对2%硼304B7不锈钢组织性能的影响

为改善2%硼304B7不锈钢的力学性能,研究分析了含硼304B7不锈钢经不同热处理工艺固溶处理后硼化物的组成、形态、分布及304B7不锈钢力学性能的变化规律。试验结果表明:硼化物由Cr2B和（FeCr）2B两相组成;铸态时硼化物呈网状分布,轧态时硼化物呈块状沿轧制方向带状分布;硼化物的热稳定性较好,经高温固溶处理后硼化物的量变化不大,其中1 150℃保温1 h水冷为304B7不锈钢较合适的热处理制度,处理后析出的硼化物尺寸较小,分布弥散,其整体力学性能相对较好,冲击功达到了 10.4 J,屈服强度达到348 MPa,抗拉强度到达659 MPa。

Effect of Heat Treatment Process on Microstructure and Properties of 2% Boron 304B7 Stainless Steel

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.