采用 Gleeble?3500热模拟试验机在温度为1020~1150°C、应变速率为0.0003~1.0 s?1条件下，对喷射成形低固溶高熔点(LSHR)合金进行热压缩实验，研究其流变行为。建立其本构方程，绘制能量耗散图以及热加工图，观察基于不同能量耗散因子的微观演变和位错分布特征。结果表明，流变应力随温度的降低、应变速率增加而增大。经计算，喷射成形 LSHR 合金的变形激活能为1243.83 kJ/mol。当应变为0.5时，在加工图能量耗散因子η=0.36区域中微观组织呈典型的动态再结晶和低位错密度特征。基于微观组织演变和热加工图，喷射成形 LSHR 合金的最佳热加工参数范围为热加工温度1110~1150°C、应变速率0.01~0.3 s?1。
Flow behaviors of spray forming low solvus high refractory (LSHR) alloy were investigated using hot compression tests performed on a Gleeble?3500 thermal mechanical simulator at temperatures of 1020?1150 °C and strain rates of 0.0003?1.0 s?1. The constitutive equation was established, power dissipation (η) maps and hot processing maps were plotted. The microstructure evolution and dislocation distribution of domains with different values of η in power dissipation maps were also observed. The results show that the flow stress increases with decreasing temperature and increasing strain rate. The activation energy of the spray forming LSHR alloy is 1243.86 kJ/mol. When the value of η is 0.36 at the strain of 0.5, the domain in the processing map shows characteristics of typical dynamic recrystallization (DRX) and low dislocation density. According to the microstructure evolution and processing maps, the optimum processing condition for good hot workability of spray forming LSHR alloy can be summed up as:temperature range 1110?1150 °C; strain rate range 0.01?0.3 s?1.
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