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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.2; Jul 7-11, 2003; Leganes, Madrid, Spain >Effect of Solidification Structure and Thermomechanical Processing on Microstructure and Texture of Ferritic Stainless Steels
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Effect of Solidification Structure and Thermomechanical Processing on Microstructure and Texture of Ferritic Stainless Steels

机译：凝固组织和热机械加工对铁素体不锈钢组织和织构的影响

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摘要

Because ferritic stainless steels are not subject to dynamic recrystallization, a large unrecrystallized zone is formed at strip mid-thickness after hot rolling and annealing. The difference in texture among these refractory grains produces, during deep drawing of final product, an undesired surface aspect called roping. In this paper hot rolled and annealed samples of AISI 430 ferritic stainless steel have been investigated in order to assess the effect of the initial columnar or equiaxed solidification structure on final microstructure and textural behaviour. Wedge-shaped specimens were machined from slabs with both columnar and equiaxed structure, hot rolled with various thickness reductions (30 - 75%) at different temperatures (1050℃-1200℃) and heat treated simulating industrial annealing. An attempt has been made to relate microstructural and textural properties with surface roping behaviour. Therefore, some of the samples have been subsequently cold rolled and annealed in laboratory and ranked in terms of roping grade by roughness measurements. Results show that the recrystallized volume fraction after hot rolling and annealing is higher in the samples with an initial equiaxed solidification structure. Poor influence of the hot rolling parameters was detected for a given solidification structure. Less susceptibility to roping has been observed on cold rolled samples from initial equiaxed solidification structure.
机译：由于铁素体不锈钢不进行动态再结晶，因此在热轧和退火后，带材中间厚度处会形成较大的未再结晶区。在最终产品的深冲过程中，这些耐火晶粒之间的质地差异会产生不希望的表面形状，称为拉丝。在本文中，对AISI 430铁素体不锈钢的热轧和退火样品进行了研究，以评估初始柱状或等轴凝固组织对最终组织和组织行为的影响。楔形试样由具有圆柱状和等轴结构的板坯加工而成，在不同温度（1050℃-1200℃）下以不同的厚度减小率（30-75％）热轧，并进行模拟工业退火的热处理。已经尝试将微观结构和纹理特性与表面成绳行为相关联。因此，一些样品随后在实验室中进行了冷轧和退火，并通过粗糙度测量以粗化等级进行排名。结果表明，在具有初始等轴凝固组织的样品中，热轧和退火后的重结晶体积分数更高。对于给定的凝固组织，检测到热轧参数的不良影响。在最初等轴凝固组织的冷轧样品上，观察到的不易起皱的现象。

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