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Microstructure and high temperature mechanical properties of as-cast FeCrAl alloys

机译：铸态FeCrAl合金的显微组织和高温力学性能

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摘要

The microstructure and high temperature mechanical properties of as-cast FeCrAl alloys with varying aluminum contents were experimentally investigated. Crystal phases were identified using X-ray diffractometry and the solidified structures were analyzed, taking into account the freezing range, AIN precipitation and the aluminum addition. A series of tensile tests were conducted at temperatures from 700 degrees C to 1200 degrees C and the effects of aluminum content on the stress-strain behavior including peak stress, yield stress and Young's modulus were investigated. The solid-solution strengthening of aluminum is reflected by the increase of peak stress and yield stress with increasing aluminum content at all temperatures, particularly below 1000 degrees C. Hot ductility is discussed in terms of the variations of the reduction in area value with temperature. Decreased ductility between 800 degrees C and 900 degrees C is attributed to ferritic grain coarsening and the precipitation of carbides within the grain boundaries. The occurrence of continuous dynamic recrystallization under the conditions of this study, can play an important role in grain refinement thus increasing the hot ductility of FeCrAl alloys.
机译：实验研究了不同铝含量的铸态FeCrAl合金的显微组织和高温力学性能。使用X射线衍射仪确定晶相，并考虑凝固范围，AlN沉淀和铝添加量，分析了凝固组织。在700摄氏度至1200摄氏度的温度下进行了一系列拉伸试验，研究了铝含量对应力应变行为的影响，包括峰值应力，屈服应力和杨氏模量。在所有温度下，特别是在低于1000摄氏度时，随着铝含量的增加，峰值应力和屈服应力的增加反映了铝的固溶强化。讨论了热延展性是根据面积值的减小随温度的变化而进行的。 800摄氏度至900摄氏度之间的延展性降低归因于铁素体晶粒粗化和碳化物在晶界内的析出。在此研究条件下连续动态再结晶的发生，可以在晶粒细化中发挥重要作用，从而提高FeCrAl合金的热延展性。

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