采用等温压缩实验研究了具有马氏体组织的TC11合金在两相区的变形行为及微观组织演变规律.等温压缩实验在Gleeble3500热模拟实验机上进行,其中变形温度为920～980℃,应变速率为0.1～10s-1,变形量为70%.基于动态材料模型(DMM),建立了具有马氏体组织的Tcll合金两相区变形的热加工图.在低温(＜940℃)区和高温(＞960℃)高应变速率(＞1 s-1)区域存在失稳现象,主要表现为低温时的表面开裂和高应变速率区的绝热剪切带;在塑性加工安全区域,分别对应着片层扭折和片层球化的组织机制,其中变形量70%时应变速率敏感因子在980℃,0.1 s-1时取得峰值为0.73,此时可得到完全球化的细晶组织(等轴α尺寸约为0.7μm).具有马氏体组织的TC11合金两相区变形时,为避免缺陷并得到细的等轴组织,合适的加工工艺为温度:950～980℃,应变速率0.1～1 s-1.
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