Structure and Properties of Nanograined Fe–C Alloys after Severe Plastic Deformation
Structure and Properties of Nanograined Fe–C Alloys after Severe Plastic Deformation
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DOI：
10.1002/adem.201000312
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发表时间：
2011-06
影响因子：
3.6
通讯作者：
B. Straumal;S. Dobatkin;A. O. Rodin;S. Protasova;A. Mazilkin;D. Goll;B. Baretzky
中科院分区：
文献类型：
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作者：
B. Straumal;S. Dobatkin;A. O. Rodin;S. Protasova;A. Mazilkin;D. Goll;B. Baretzky
研究了几种Fe-C合金在以下条件下的显微组织和性能：a）铸态，B）725 °C下长时间退火后，以及c）高压扭转（HPT）后。HPT后的晶粒尺寸在纳米范围内。HPT后合金中只剩下Fe 3C（Al 2 O3）和α-Fe。不稳定的Hägg碳化物和残余奥氏体在HPT后消失，相组成接近对应于HPT温度和压力的平衡。这种HPT行为不同于与球磨相关的行为，球磨可导致形成亚稳相或非晶相。因此，剧烈的塑性变形为生产具有非常稳定的相结构的材料开辟了道路，从而确保了纳米晶粒钢在其使用寿命期间的稳定性能。
The microstructure and properties of several Fe–C alloys are studied in a) the as‐cast state, b) after a long annealing time at 725 °C, and, c) after high‐pressure torsion (HPT) The grain size after HPT is in the nanometer range. Only Fe3C (cementite) and α‐Fe remain in the alloys after HPT. Less stable Hägg carbide and retained austenite disappear after HPT, and phase composition closely approaches the equilibrium corresponding to the HPT temperature and pressure. This HPT behavior differs from that associated with ball‐milling, which can lead to the formation of metastable or amorphous phases. Therefore, severe plastic deformation opens the way to produce materials with very stable phase structure and thus ensures the stable properties of nanograined steel during its life‐time.