对烧结态93W-4.5Ni-2.1Fe-0-35Co钨合金进行热挤压变形强化,获得纤维组织,再通过冷扭转变形调整纤维状钨颗粒的取向,对压、扭复合工艺制备的钨合金进行动态雎缩性能测试和绝热剪切敏感性的分析,并与烧结态和冷扭转态钨合金作对比研究.结果表明,热压、冷扭复合工艺制备的钨合金在具备高屈服强度的同时,具备了较高的绝热剪切敏感性.微观分析表明,热压、冷扭复合工艺改变了条状粘结相组织的受力状态和分布状态,从而导致钨合金绝热剪切敏感性的提高.
Liquid phase sintered 93W-4.5Ni-2.1Fe-0.35Co tungsten alloy was prepared by hot-hydrostatic extrusion(HE)to obtain fibrous microstructure,followed by cold torsion(CT)to modulate the fiber direction.The dynamic mechanical properties and susceptibility to adiabatic shear band(ASB)of the tungsten heavy alloy(WHA)deformed by the HE & CT were systematically investigated.Results show that the HE & CT process has evidently improved the dynamic yielding strength and susceptibility to ASB.Microstructure analyses reveal that the micro-stress states of tungsten fibers and the distribution of the binder phase changing with fibrous orientations were accounted for the high susceptibility to ASB.
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