High strength and ductile low density austenitic FeMnAlC steels: Simplex and alloys strengthened by nanoscale ordered carbides
High strength and ductile low density austenitic FeMnAlC steels: Simplex and alloys strengthened by nanoscale ordered carbides
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DOI：
10.1179/1743284714y.0000000515
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发表时间：
2014-05
影响因子：
1.8
通讯作者：
I. Gutierrez-Urrutia;D. Raabe
中科院分区：
文献类型：
--
作者：
I. Gutierrez-Urrutia;D. Raabe
介绍了高性能奥氏体FeMnAlC钢的合金设计概念，即Simplex和纳米级有序κ-碳化物强化合金。Simplex钢的特点是在室温下具有出色的应变硬化能力。这是由于与位错亚结构细化和随后的变形孪晶激活相关的多阶段应变硬化行为，这导致应变硬化的稳步增加。当Al含量高于5 wt %时，可促进纳米级L′12有序析出相（即κ-碳化物）的析出，从而获得高强度（屈服应力≥ 1.0GPa）和高韧性（断裂伸长率≥ 30）钢。讨论了纳米κ-碳化物强化Fe-30·5 Mn-8·0Al-1·2C（wt-）钢中位错-颗粒相互作用的新见解。
We introduce the alloy design concepts of high performance austenitic FeMnAlC steels, namely, Simplex and alloys strengthened by nanoscale ordered κ-carbides. Simplex steels are characterised by an outstanding strain hardening capacity at room temperature. This is attributed to the multiple stage strain hardening behaviour associated to dislocation substructure refinement and subsequent activation of deformation twinning, which leads to a steadily increase of the strain hardening. Al additions higher that 5 wt- promote the precipitation of nanoscale L′12 ordered precipitates (so called κ-carbides) resulting in high strength (yield stress ∼1·0 GPa) and ductile (elongation to fracture ∼30) steels. Novel insights into dislocation–particle interactions in a Fe–30·5Mn–8·0Al–1·2C (wt-) steel strengthened by nanoscale κ-carbides are discussed.