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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Initial Equiaxed Crystal Ratio in As-Cast Slab on Texture Evolution and Formability of Ferritic Stainless Steel
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Effects of Initial Equiaxed Crystal Ratio in As-Cast Slab on Texture Evolution and Formability of Ferritic Stainless Steel

机译：铸造板坯初始晶体比对铁素体不锈钢纹理演化及成形性的影响

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摘要

In this study, as-cast ferritic stainless steel samples with columnar, equiaxed and mixed crystals were selected as initial specimens and subsequently subjected to various thermomechanical treatments, in order to investigate the effects of initial equiaxed crystal ratio on microstructure and texture evolution, final formability and ridging characteristics during subsequent processes. Results showed that the microstructures of samples with different initial equiaxed crystal ratios presented limited difference after appropriate cold-rolled annealing treatment at 880 degrees C and the grains were almost completely recrystallized and basically equiaxed. The texture of {111}//ND gamma-fiber was mainly recorded in the final sheet, which was beneficial to improve formability. The sample with 50% initial equiaxed crystal ratio exhibited slightly rougher surface and larger ridging height after tensile straining of 20%, while Erichsen index values presented only 2.4% difference irrespective of initial equiaxed crystal ratio. It was found that initial equiaxed crystal ratio was not the main factor affecting final formability and ridging characteristics of ferritic stainless steel as limited difference was observed. Appropriate annealing treatment could improve textures and microstructures even if the initial structure contains typically mixed columnar-equiaxed grains.
机译：在本研究中，选择具有柱状晶、等轴晶和混合晶的铸态铁素体不锈钢样品作为初始试样，随后进行各种热机械处理，以研究初始等轴晶比对后续过程中微观结构和织构演变、最终成形性和起皱特性的影响。结果表明，经880℃适当的冷轧退火处理后，不同初始等轴晶比的试样的显微组织差别不大，晶粒几乎完全再结晶，基本等轴。{111}//NDγ纤维的织构主要记录在最终板材中，这有利于提高成形性。初始等轴晶比为50%的样品在拉伸应变为20%后，表面稍粗糙，脊状高度较大，而无论初始等轴晶比如何，埃里克森指数仅相差2.4%。发现初始等轴晶比不是影响铁素体不锈钢最终成形性和起皱特性的主要因素，因为观察到的差异有限。适当的退火处理可以改善织构和微观结构，即使初始结构包含典型的混合柱状等轴晶粒。

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