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为得到锆-钛-钢爆炸复合板最优热处理工艺,采用正交试验法研究保温温度、保温时间和热处理升降温速率3个因素对复合板粘结强度和残余应力的影响。结果表明,保温温度540℃、保温时间1 h、热处理升降温速率60℃/h为最优热处理工艺,复合板可以获得最佳粘结强度和残余应力状态组合,保温温度过高,时间太长都会降低粘结强度。此外,还对最优热处理工艺下复合板结合面进行了显微硬度测定,微观组织和断口形貌的观察。分析显示,复合板结合界面附近形成细晶区,显微硬度较大;结合面粘结试验断裂形式为韧性加解理混合型断裂。
In order to get the optimal heat treatment process of zirconium - titanium - steel explosive composite plate, orthogonal test was used to study the influence of three factors on the bond strength and residual stress of the composite plate: holding temperature, holding time and heating and cooling rate. The results show that the best heat treatment process is the heat preservation temperature of 540 ℃, holding time of 1 h and heating / cooling rate of heat treatment at 60 ℃ / h. The best combination of bond strength and residual stress state can be obtained for composite board. The heat preservation temperature is too high and the time is too long Will reduce the bond strength. In addition, the microhardness, microstructure and fracture morphology of the composite plate under the optimal heat treatment process were also observed. The analysis shows that the fine-grained zone is formed near the bonding interface of the composite plate and the micro-hardness is relatively large. The bonding failure test is a combined ductile and cleavage fracture.