高硼钢的微观组织和性能

Study on microstructure and properties of high borated steel

采用铸造和粉末冶金工艺制备硼含量分别为1.04%、1.50%和1.86%的高硼钢,研究了合金的微观组织、物相、硼元素在组织中的分布和物理、力学性能。实验结果表明:粉末冶金工艺制备的合金硼元素分布均匀、而铸造合金硼元素偏聚在晶界,所以前者制备的合金塑性明显优于后者。检测了304B7高硼钢的线膨胀系数和热导率,与普通304不锈钢性能无明显区别。

High borated steel with boron content of 1.04%,1.50% and 1.9% were prepared by powder metallurgy and casting process.The microstructure,phase,distribution of boron element and their effects on the properties of the alloy were studied.The results show that the distribution of boron element in the alloy prepared by powder metallurgy is uniform,while the boron element in the casting alloy segregated at the grain boundary,so the plasticity of the alloy prepared by the former is obviously better than the latter.The linear expansion coefficient and thermal conductivity of the alloy were measured.The properties of 304B7 high boron steel are similar to those of 304 stainless steel.