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首页> 外文期刊>Materials Science and Engineering >Deformation induced austenite formation in as-cast 2101 duplex stainless steel and its effect on hot-ductility
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Deformation induced austenite formation in as-cast 2101 duplex stainless steel and its effect on hot-ductility

机译：2101铸态双相不锈钢中形变引起的奥氏体形成及其对热延性的影响

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摘要

The microstructural evolution during hot deformation of 2101 grade lean duplex stainless steel and its effect on hot-workability have been investigated by hot-compression testing using Gleeble~® simulator over the range of deformation temperature of 800-1100 ℃. Besides the dynamic recovery of δ-ferrite matrix and deformation of large austenite (γ) regions, fine γ-islands (＜ 8 μm in size) were observed to form inside the δ-matrix. The density of those islands reached the highest value at deformation temperature of 900-1000 ℃ and increased significantly with the increase in applied true strain from 0.25 to 0.8. Such γ-islands are expected to form either by dynamic strain induced 8 to γ transformation or by γ to δ strain-induced transformation followed by rapid precipitation of γ on heterogeneous nucleation sites (sub-grain boundaries, deformation bands etc.) present in the δ-matrix. The average size of the islands decreased with the decrease in deformation temperature. As the precipitated γ-islands follow Kurdjumov-Sachs orientation relationship with the δ-ferrite matrix, formation of such islands is detrimental to the hot-workability of the duplex stainless steel. Those islands not only restrict the plastic flow in δ-matrix but also provide favourable path for crack propagation through the δ.
机译：通过使用Gleeble〜®模拟器在800-1100℃变形温度范围内进行热压缩试验，研究了2101级贫双相不锈钢在热变形过程中的显微组织演变及其对热加工性能的影响。除了δ铁素体基体的动态恢复和大奥氏体（γ）区域的变形之外，还观察到在δ矩阵内部形成了细小的γ岛（尺寸小于8μm）。这些岛的密度在变形温度为900-1000℃时达到最高值，并随着施加的真实应变从0.25增加到0.8而显着增加。此类γ岛有望通过8到γ应变引起的动态应变诱导或δ到δ应变诱导的转化引起动态γ的形成，然后将γ快速沉淀在存在于晶核中的异质形核位点（亚晶粒边界，形变带等）上。 δ矩阵。岛的平均尺寸随着变形温度的降低而减小。由于析出的γ岛遵循与δ-铁素体基体的Kurdjumov-Sachs取向关系，因此形成这样的岛对双相不锈钢的热加工性有害。这些岛不仅限制了δ矩阵中的塑性流动，而且为裂纹通过δ传播提供了有利的路径。

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