热处理对锆-钛-钢复合板力学性能及显微组织的影响

为了获得更好的锆-钛-钢复合板的综合性能,研究了热处理对锆-钛-钢复合板的影响。通过对锆-钛-钢界面的剪切强度试验分析,发现剪切强度随热处理温度的降低而减小。垂直于波纹方向的抗剪强度高于平行于波纹方向的抗剪强度。基于正交试验和方法分析,热处理因素对剪切强度和粘接强度的影响主次关系是:保温温度>保温时间>温度变化率。剪切试验的断口形貌为局部脆性断裂的韧性断裂。通过对力学性能、界面组织和显微硬度的分析,500℃,2 h,60℃/h;540℃,1 h,60℃/h的热处理均为合适的热处理工艺。随着保温温度的升高,晶粒变粗,界面富集元素富集区和扩散区,形成脆性金属间化合物Fe Ti。界面的显微硬度随热处理温度的升高而降低。

Effect of heat treatment on the mechanical properties and microstructure of zirconium-titanium-steel composite plate

In order to obtain better comprehensive performances of Zr/Ti/steel composite plate,the effect of heat treatment on Zr/Ti/steel composite plate was investigated.Based on shear test analysis of titanium-steel interface,the trend has been found that shear strength decreases along with the heat treatment temperature.Besides,the shear strength vertical to wave direction is higher than that parallel to wave direction.Based on orthogonal test and variance analysis,it is found out that the significance of heat treatment on shear strength and bonding strength is that:holding temperature>holding time>temperature change rate.The fracture appearance of shear specimen is ductile fracture including local brittle fracture.The heat treatments of 500 oC,2 h,60 oC/h and 540 oC,1 h,60 oC/h are both appropriate heat treatment processes through the analysis of microstructure and micro-hardness on interface.With the holding temperature increasing,the grains become coarsening and the brittle intermetallic compounds-Fe Ti is formed.The micro-hardness of interface drops along with the increase in heat treatment temperature.