共查询到19条相似文献,搜索用时 203 毫秒
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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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使用X射线衍射技术研究冷轧变形量和退火温度对Ni47Ti44Nb9合金一次冷轧和二次冷轧板织构和性能的影响。结果表明,在冷轧变形量小于35%时,一次冷轧板的织构主要为{111}-110-,与热轧态织构不同,随冷轧变形量的增加,织构取向密度略有提高;二次冷轧板主要织构为{111}-110-,在-110-//RD取向线上从{111}-110-延伸到{110}-110-,二次冷轧使织构取向密度获得较大提高。当二次冷轧板材在高于500℃退火时,其主要织构为{111}-112-再结晶织构,700℃、60 min炉冷样品织构的取向密度明显高于相同制度下水淬样品织构的取向密度。 相似文献
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利用热模拟试验机、光学显微镜和X射线衍射仪对Fe-3.2%Si低温取向硅钢热轧工艺参数对组织及织构的影响进行了研究。结果表明,Fe-3.2%Si硅钢在1110℃粗轧、880℃终轧,轧后以10℃/s的速度冷却到550℃卷取,然后空冷到室温,热轧硅钢板沿板厚方向的显微组织不均匀性显著,对后续发展完善的二次再结晶有重要作用。无论是热轧板,常化板还是冷轧板,它们的织构集中分布在γ取向线上,γ取向线的织构除取向密度不同外,织构种类是一致的,这说明γ取向线上织构是有继承性的。从热轧到常化,织构取向密度显著减小,经二次冷轧后,织构密度又显著升高,可见,轧制变形有助于织构的形成并使织构强度升高。 相似文献
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研究了50W470牌号无取向硅钢在热轧、正火、冷轧和退火过程中组织和织构演变。结果表明,热轧板表面为发生再结晶的细小等轴铁素体,主要织构为{110}<115>,过渡层和中心处以α纤维织构和较弱的γ纤维织构主。正火板的平均晶粒尺寸为90.5 μm,正火减弱了热轧板中对磁性能不利的γ纤维织构。冷轧板织构为强的α纤维织构和较弱的γ纤维织构。退火板的平均晶粒尺寸为74.2 μm,退火板织构主要是以{111}<112>取向为主的γ纤维织构,{100}和{110}面织构分别达到了7%和5.9%。正火50W470无取向硅钢的平均铁损P1.5/50和磁感B50分别达到了2.99 W/kg和1.725 T。 相似文献
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基于薄带连铸技术,采用单阶段冷轧和两阶段冷轧工艺分别制备了0.35 mm和0.20 mm高牌号无取向硅钢,利用EBSD、XRD等检测手段分析了无取向硅钢制备全流程的组织和织构演变。研究表明,薄带连铸制备的铸带以粗大柱状晶为主,且具有较强λ纤维织构,取向密度达到4.76,无γ织构。正火处理后部分等轴晶粒长大,织构类型没有明显变化。单阶段冷轧板以α织构为主,经退火后再结晶织构以均匀λ织构和γ织构为主,强点为{001}<120>,取向密度为5.41。两阶段冷轧板以λ织构和γ织构为主,剪切变形明显。再结晶退火后组织相对粗大,且形成了较强的Cube织构,取向密度为6.45。得益于初始有利织构的遗传,试验钢具有高磁感、较高强度优势,且铁损值达到常规流程相当水平。0.35 mm退火板B50达到1.77 T,P1.0/400为20.78 W/kg。0.20 mm退火板B50为1.70 T,P1.0/400达到13.74 W/kg,高频铁损优势明显。两种规格无取向硅钢屈服强度均超过415 MPa,伸长率超过15%。 相似文献
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采用Zeiss光学显微镜及X射线衍射仪对含铜低温取向硅钢生产过程中热轧、一次冷轧、脱碳退火和二次冷轧阶段的显微组织与织构的演变规律进行了研究。结果表明:热轧试样的组织与织构在厚度方向上呈现明显的梯度变化,试样的表层和过渡层发生再结晶,过渡层存在较强的Goss织构,中心层存在以{001}<110>为主的强α织构。一次冷轧后试样组织被轧制成沿轧向分布的纤维状组织,织构以强α和弱γ织构为主。脱碳退火后试样发生再结晶,晶粒平均尺寸为15.69 μm,总体织构强度有所减弱,但Goss织构强度升高。二次冷轧后组织由等轴晶粒变为纺锤状组织,织构以弱α和强γ织构为主,其中{111}<112>强度最高。 相似文献
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热轧组织对冷轧无取向硅钢退火织构及组织的影响 总被引:1,自引:1,他引:0
对不同加热温度处理的热轧低硅钢带进行了冷轧及退火实验,分析了热轧钢带的组织对冷轧无取向硅钢再结晶退火过程中的组织及织构的影响。结果表明:热轧组织对冷轧无取向电工钢冷轧板再结晶组织及织构演变有重要影响;等轴晶粒组织的热轧钢带比混晶组织的热轧钢带冷轧后再结晶退火快,且退火后晶粒尺寸均匀;随着等轴晶粒尺寸增加,冷轧退火后形成的冷轧硅钢{110}类型的织构增强,{100}类型的织构减弱;表明热轧组织为等轴晶粒时,不利于冷轧无取向硅钢磁性能的改善。 相似文献
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采用光学显微镜和扫描电镜对比研究了铁素体区热轧工艺及奥氏体区热轧工艺对普通用冷轧钢板(SPCC)产品热轧组织、冷轧组织及性能的影响。结果表明,与奥氏体区轧制工艺相比,采用铁素体区热轧工艺生产的SPCC热轧板晶粒尺寸会增大约17 μm,{111}面织构数量减少了8.74%,强度略微降低,而{001}<110>织构数量增加了12.40%,强度提高了19.81。此外,采用铁素体区热轧工艺生产的SPCC成品晶粒呈近似等轴状,与奥氏体区热轧工艺相比平均晶粒尺寸增大了4.5 μm。SPCC铁素体区轧制热轧板中更大的晶粒尺寸、更少的{111}面织构及更强的{001}<110>取向织构导致了冷轧成品更低的屈服强度和塑性应变比r值,较奥氏体区热轧工艺而言平均屈服强度降低了19 MPa,平均r值下降了1.1。 相似文献
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A. Saxena S. K. Shukla S. K. Chaudhuri 《Journal of Materials Engineering and Performance》2003,12(3):317-323
A comprehensive understanding was developed on the evolution of microstructure and texture during annealing of Nb bearing
microalloyed drawing quality high strength cold rolled (HSCR) sheet with specific reference to cold rolling and annealing
practices. Further, this study aimed at establishing the best combination of these processing parameters to achieve an YET
value of 1.4 min. For a hot rolled microstructure of moderately coarse ferrite grain of size 16 μm, it was observed that 70%
cold reduction guaranteed high intensity of (222) component accompanied with minimum intensity of (200) component. Further,
investigation was carried out to understand the influence of annealing time on recrystallization behavior and texture development
during intermediate annealing of 60% and 70% cold reduced specimens at 550 °C. It was found that recrystallization ceased
after 12 h of intermediate annealing at 550 °C. The textures and microstructures produced during final annealing of 70% cold
rolled specimens at various temperatures like 670, 690, 710, and 730 °C with varied duration of soaking (12–18 h) were critically
examined. An YET value of ∼1.5 was achieved in HSCR microalloyed steel when 70% cold rolled specimens were intermediately
annealed at 550 °C for 12 h followed by final annealing at 710 °C for 12 h. 相似文献
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某钢厂试开发基于铁素体轧制工艺的SPCC板,经热轧-冷轧-罩式退火工序后对样品进行性能检测,发现与传统奥氏体轧制工艺相比,该工艺路径下的产品各项力学性能指标均有不同程度下降,且r值有明显降低。对两种工艺路径的热轧板和冷轧退火成品板进行了组织和织构的对比分析,且提出了改进措施。结果表明:铁素体轧制工艺中热轧精轧温度过高,形成两相区轧制,得到粗大F+纤维状F的不均匀室温组织,从而导致冷轧退火板中存在较高强度{001}<110>织构组分,是导致最终产品r值降低的主要原因。 相似文献
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Haitao Yan Hongyun Bi Xin Li Zhou Xu 《Journal of Materials Processing Technology》2009,209(5):2627-2631
In order to better understand the texture, microstructure and grain boundaries character distribution evolution of ferritic stainless steel, the texture, microstructure and grain boundaries character distribution of ferritic stainless steel (hot rolled sheet, cold rolled sheet and annealing sheet) with 11 wt%Cr content were studied using X-ray diffraction and electron back scattered diffraction technique. The texture of the hot and cold rolled sheets has a through-thickness texture gradient. In the center layer of the hot and cold rolling sheet, α-fiber texture was observed which was attributed to ideal plane strain deformation. Close to the surface a Gross orientation was detected which was attributed to shear deformation. During annealing, the γ-fiber was formed attributed to recrystallization process. The microstructure of the hot and cold rolled sheets was non-homogeneous through the sheet thickness, while, the microstructure of annealing sheets was homogeneous through the sheet thickness. Grain boundaries character distribution results show that there are many low angle grain boundaries in hot and cold rolled sheets and many high angle grain boundaries and coincidence site lattice after annealing. The above results indicated that the changes in texture are closely related to the grain boundaries type. 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
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Chunbo Cai Zesheng Ji Huajun Zhang 《Journal of Materials Engineering and Performance》2010,19(5):627-632
To improve the surface morphology, formability, and deep drawing properties of 1050 aluminum alloy sheets, laser-textured
rolls were used in cold rolling process. Effects of laser-textured rolls, comparing with conventional ones, on microstructure
and texture of aluminum alloys after rolling and following recrystallization were studied. In aluminum sheets processed by
laser-textured rolls and conventional rolls, microstructure and texture were similar after rolling, but significantly different
after recrystallization. Laser texturing process results in finer and inhomogeneous recrystallized grains. The recrystallization
texture of the specimen rolled with conventional roll has a major cube component and a minor R component. The intensity of
cube component increases with increasing annealing temperature. However, recrystallization texture of the specimen rolled
with laser-textured roller is much more random. The specimen shows that recrystallization texture has only a weak cube orientation
but strong rotated-cube orientation as well as a much higher fraction of random orientation. 相似文献