硅对9Cr-1.5WVTa低活化马氏体钢力学性能的影响

基于中国正在研究的聚变堆用9Cr-1.5WVTa低活化马氏体钢(CLAM钢),研究了添加合金元素硅对CLAM钢力学性能的影响。结果表明,添加0.2%Si使得CLAM钢的抗拉强度和屈服强度明显提高,钢的塑性和冲击韧性同时也得到一定提高,其中,韧脆转变温度(DBTT)由-13℃降至-30℃。未添加和添加0.29%Si的CLAM钢均为全马氏体组织,无δ铁素体存在。硅的添加使得9Cr-1.5WVTaSi钢的晶粒细化,从而提高了钢的拉伸和冲击性能。

Effect of Silicon on Mechanical Properties of 9Cr-1.5WVTa Low Activation Martensitic Steel

Based on the new Chinese low activation martensitic (CLAM) steel being developed as for fusion reactors, the effect of silicon adding on the mechanical properties of 9Cr-1.5WVTa steels was investigated. The results show that adding 0.2% silicon leads to higher tensile strength, and more excellent plasticity and impact toughness. The ductile-brittle transition temperature (DBTT) is decreased from -13 ℃ to -30 ℃. The 9Cr-1.5WVTaSi steel has a smaller prior-austenite grain size, but microstructures are similar, both fully martensitic steels free of δ-ferrite. It was summarized that the improved tensile and impact properties of the 9Cr-1.5WVTaSi steel were attributed to adding 0.2% silicon, refined the prior-austenite grain size.