共查询到14条相似文献,搜索用时 250 毫秒
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系统研究了超纯铁素体不锈钢(w(Cr)=17%)沿钢板厚度方向各层织构的演变规律和不同精轧温度对织构演变及成形性能的影响规律。采用X射线衍射仪分析了宏观织构演变。研究表明: 热轧及退火后, 钢板表层以剪切织构为主, 中心层由?和?纤维织构组成; 冷轧后, 各层均由较强的?纤维织构和较弱的?纤维织构组成; 冷轧退火后各层均形成?纤维再结晶织构。与高温精轧相比, 低温精轧有利于冷轧退火板?纤维再结晶织构的强化、偏离{111}<112>组分的程度降低, 从而显著改善冷轧退火板的成形性能。 相似文献
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以单独添加Nb及复合添加Nb和B的超纯Cr17铁素体不锈钢为试验材料,系统研究了微合金元素B对超纯Cr17铁素体不锈钢薄板的组织、织构和性能的影响。两种不同成分的坯料经相同热轧、冷轧及退火处理后,分别采用金相显微镜及X射线衍射技术观察两种成分下的组织和织构。研究结果表明,与单独添加Nb的相比,B的添加细化了再结晶组织,提高了再结晶温度;B的添加提高了成品板的强度,增加了成品板的Lüders应变;弱化了成品板的γ纤维再结晶织构,增加了强点偏离{111}〈112〉组分的程度,恶化了成品板的成形性能。 相似文献
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通过工艺控制得到了不同尺寸及分布特征的析出相,研究了其对再结晶织构的影响.结果表明:降低精轧温度有利于尺寸更加细小、分布更加弥散的析出相TiC的形成,经冷轧及退火后这种析出相分布特征可遗传至冷轧退火板;粗大、稀疏析出相的样品具有较强的γ纤维再结晶织构;细小、弥散的析出相有助于随机取向再结晶晶核的形成,抑制再结晶晶粒的长大,从而弱化了γ纤维再结晶织构及恶化了冷轧退火板成形性能;析出相对随机取向晶粒形核的作用及晶界迁移的钉扎作用是控制铁素体不锈钢再结晶织构的重要因素之一. 相似文献
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以一种含W和稀土Ce的444型耐热铁素体不锈钢19Cr2Mo1W为材料,利用XRD测试分析、EBSD取向成像技术、粗糙度测量和成形性测试等手段,研究了该铁素体不锈钢热轧板不同退火工艺对其冷轧退火板的微观组织、织构演变以及成形性能的影响。结果表明,尽管采用了不同退火温度的热轧板退火工艺,但是热轧退火板的织构特征在一定程度上均会遗传至冷轧板;热轧退火板中增强的{223}■和{111}■织构组分存在,有利于增加冷轧退火板中γ纤维织构的强度。冷轧板中{001}■~{115}■纤维织构组分越强,退火后γ纤维织构偏离理想程度越大;适当提高热轧板退火温度可以有效减弱冷轧板中有害的{001}■~{115}■组分。提高热轧板退火温度,可以显著减轻甚至彻底消除热轧退火板中的带状组织、提高冷轧退火板的组织均匀性和γ纤维织构强度,有利于成形性能的提高。 相似文献
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An ultra purified 21%Cr ferritic stainless steel (FSS) was hot rolled at a low finisher entry temperature (FET) of 750 °C to generate shear bands through large shear flow localizations in grain interiors. The effects of shear bands on the formability and surface ridging have been studied as compared to a conventional hot rolled band at the FET of 970 °C with few shear bands. The results showed that as compared to the final sheet produced with the FET of 970 °C, the average r-value for the final sheet with the FET of 750 °C was increased by 25%, and the surface roughness of the final sheet strained by 15% along the rolling direction was decreased by 40%. It has been observed that the existence of shear bands could enhance the nucleation for recrystallization during hot rolling and annealing for microstructure refinement, and modify the texture by intensifying the {1 1 1} textures in the final sheet. The influence of shear bands on sheet formability and resistance against surface ridging was discussed. 相似文献
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Fei GAO Zhenyu LIU Haitao LIU Guodong WANG The State Key Laboratory of Rolling Automation Northeastern University Shenyang China 《金属学报(英文版)》2011,(5):343-350
The influence of the finish rolling temperature on the microstructure and texture evolution of Nb and B micro-alloyed ultra purified Cr17 ferritic stainless steels was investigated. The hot rolled bands were produced by conventional rolling process and the finish rolling at relatively low temperatures or warm rolling. The microstructure was observed by optical microscopy,scanning electron microscopy and transmission electron microscopy,and X-ray diffraction was used to characterize the texture evolution processes. The results showed that as compared to conventional hot rolling process,the warm rolling has led to the refined and homogeneous microstructure and uniform recrystallization texture along γ-fiber in final sheets,indicating that the finish rolling at relatively low temperatures can be the effective way to improve significantly the formability of final sheets. 相似文献