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在动态应变时效温度范围内的予应变,作为一种强化机理,与多次机械热处理进行了比较。发现通过动态应变时效处理获得与多次机械热处理相同或更高的强度。电子显微镜观测表明,动态应变时效处理得到的位错结构与多次热机械处理得到的非常相象;此两种处理都产生了只具有一种不完整的晶胞结构的很高的位错密度,从而使人联想到,在跳动流变的温域中形变的铁显示出的高加工硬化率和有限的动态回复,正反映为动态应变时效处理后室温强度的增高。
Pre-strain in the dynamic strain aging temperature range is compared with several mechanical heat treatments as a hardening mechanism. It was found that the same or higher strength than the mechanical heat treatment was obtained by the dynamic strain aging treatment. Electron microscopy observations indicate that dislocation structures obtained by dynamic strain aging are very similar to those obtained by multiple thermo-mechanical treatments; both of these processes result in very high dislocation densities with only an incomplete unit cell structure , Reminiscent of the fact that the high work-hardening rates and the limited dynamic recovery exhibited by the deformed iron in the beating rheological temperature range are reflected in the increase in room temperature strength after dynamic strain aging.