High-strain-rate superplasticity in ultrahigh-carbon steel containing 10wt.%Al (UHCS-10Al)
High-strain-rate superplasticity in ultrahigh-carbon steel containing 10wt.%Al (UHCS-10Al)
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DOI：
10.1016/1359-6462(96)00068-1
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发表时间：
1996-06-15
影响因子：
6
通讯作者：
Sherby, OD
中科院分区：
文献类型：
--
作者：
Taleff, EM;Nagao, M;Sherby, OD
本研究代表了一种新的加工路线，通过该路线可以在两相铁基合金中获得高应变率超塑性。在本研究中，采用粉末冶金技术加工含 10 wt.% Al 的超高碳钢 (UHCS-10Al)。使用机械磨损对预合金粉末进行大量冷加工，从而形成高应变率超塑性所需的非常精细的微观结构特征。由于该材料含有{α}-Fe和{kappa}-碳化物（Fe{sub 3}AlC{sub x}，其中x = 0.5至1）两相，因此在加工温度范围内，在固结时产生细晶粒尺寸并在变形过程中保留。正是这种细小的晶粒尺寸导致了观察到的高应变率超塑性行为。
The present study represents a new processing route by which high-strain-rate superplasticity can be obtained in a two-phase, Fe-base alloy. For this study, an ultrahigh-carbon steel containing 10 wt.% Al (UHCS-10Al) was processed by a powder-metallurgy technique. Mechanical attrition was used to introduce a large degree of cold work into pre-alloyed powders, creating the very fine microstructural features necessary for high-strain-rate superplasticity. Because this material contains two phases, {alpha}-Fe and {kappa}-carbide (Fe{sub 3}AlC{sub x} where x = 0.5 to 1), in the range of processing temperatures, a fine grain size was produced upon consolidation and retained during deformation. It is this fine grain size which is responsible for the high-strain-rate superplastic behavior observed.