硼含量对高硼中碳合金钢显微组织及力学性能的影响

Effects of Boron Content on Microstructures and Mechanical Properties of High Boron Medium Carbon Alloy Steel

研究了高硼中碳合金钢中硼含量对其显微组织和力学性能的影响。结果表明,该合金钢的铸态组织由硼化物或硼碳化合物、少量残留奥氏体以及马氏体组成。随着硼含量的增加合金钢组织逐渐向过共晶形态转变,鱼骨状共晶组织数量增加。此外,在碳含量不变的情况下,随着硼含量的增加,材料冲击韧度降低、硬度增大。

The effect of boron content on the microstructures and mechanical properties of high boron medium carbon alloy steel was investigated. The results show that the microstructure is made of boride or boron-carbon compound, a small number of retained austenites and martensites. The microstrucmre transforms into a eutectic morphology with the increase of boron content, and the fishbone eutectic amount increases. When the carbon content is constant, the impact toughness of the alloy steel decreases but the hardness increases with the increase of boron content.