含Ti复合夹杂物对中碳非调质钢组织和力学性能的影响

Effect of Ti-containing complex inclusions on the microstructure and mechanical properties of medium carbon non-quenched and tempered steel

利用扫描电镜和能谱仪研究了含Ti复合夹杂物对非调质钢组织细化的影响,测定了含Ti非调质钢的室温拉伸强度和冲击功,并观察了断口形貌.结果表明:Ti的复合夹杂物可以作为晶内铁素体形核核心,细化奥氏体晶粒;加Ti后冲击断口中延性形貌所占面积比例上升,在保持非调质钢强度的条件下使韧性提高约50%.

The effect of Ti-containing complex inclusions on the microstructure refinement of non-quenched and tempered steel was studied by using SEM and EDS. The room temperature tensile strength and absorbed-infracture energy of the tested steel were tested, and the fractography was observed. The results show that Ticontaining complex inclusions act as the nuclei for intra-granular ferrites and refine austenite grains, and with Ti added, the area proportion of ductile fracture is increased. The toughness of the studied steel is enhanced by about 50 % while keeping the same strength level.