共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
冷轧压下量对铁素体区热轧Ti-IF钢冷轧板的再结晶织构特点和深冲性能的影响 总被引:10,自引:0,他引:10
研究了一种Ti-IF钢在未再结晶铁素体区润滑热轧后,冷轧压下量对IF钢退火后的深冲性能和织构的影响,通过采用非再结晶铁素体区的润滑热轧和冷轧工艺,Ti-IF钢连续退火工艺冷轧板的γ值在73%的冷轧压下量的效果与传统工艺90%冷轧上量相当,织构分析表明,采用铁 体润滑热轧的热轧板轧制织构中具有罗强的(111)/ND组分当采用73%冷轧压下量和随后的退火工可获得最强的(111)/NK再结晶织构,进一步 相似文献
3.
在工业生产条件下,对比分析了不同热轧终轧温度对中低牌号无取向硅钢组织和磁性能影响。结果表明:当热轧终轧温度为890℃时,热轧带钢表层为铁素体再结晶组织,芯部为铁素体相变组织;带钢经冷轧退火后,成品晶粒细小,铁损为5.565 W/kg,磁感为1.744 T,磁性能较差;当终轧温度为870℃时,热轧带钢全为粗大的铁素体再结晶组织,带钢经冷轧退火后,成品晶粒粗大,铁损降低至5.329 W/kg,磁感升高至1.762 T,磁性能最佳;当终轧温度降低至850℃时,带钢在热轧时再结晶晶粒难以长大,经冷轧退火后,铁损为5.507 W/kg,磁感为1.760 T,磁性能介于890℃和870℃之间。此外,实际工业生产数据表明,当热轧终轧温度为850~875℃时,成品磁性能明显优于880~900℃。 相似文献
4.
平整机的板形改善机制及其应用 总被引:1,自引:0,他引:1
分析了带钢平整过程中带钢的应力状态、带钢表面的微观结构、能量特征及位错分布等,得出了平整过程中金属的塑性变形特征。提出了平整过程改善板形的两种机制。分析了普通冷轧产品、冷轧深冲产品、热轧产品及热轧高强钢产品在平整过程中应采取的板形控制策略及其合理的设备配置方案。 相似文献
5.
6.
7.
8.
为了研究铁素体轧制和奥氏体轧制两种不同热轧工艺对超薄规格冷轧IF钢组织、织构和成形性能的影响,采用金相显微镜和XRD衍射仪分别观察和检测了两种热轧工艺下热轧、冷轧、退火带钢微观组织和宏观织构,采用EBSD检测了退火带钢的表面微观织构,采用拉伸试验机分别检测了退火带钢沿轧向、45°方向和横向的力学性能。结果表明:相比奥氏体轧制工艺,铁素体轧制工艺下退火带钢γ织构更强,主要织构组元{111}<110>、{111}<112>强度差异更小,相应■值提高0.45,△r值降低0.10;铁素体轧制工艺下冷轧带钢位错、亚晶界等晶体缺陷密度更大,且形成的α织构更强,退火过程中具备<110>//ND取向的晶粒优先形核,且在生长过程中吞并邻近低取向差的{118}<110>、{557}<110>等其他取向晶粒,从而导致退火板形成更强的{111}织构。 相似文献
9.
为了使热轧薄板能进一步替代具有成型性的冷轧板 ,欧洲Corus公司对热轧薄板的技术条件进行了研究 ,以便生产深冲热带。热轧薄板的主要问题是不易产生有益的织构 ,因此传统生产高r值轧材的方法是采用冷轧退火。织构分为 4种 :有利于深冲的织构称为强织构 ,亦称为伽玛纤维 ;受到部分破坏的织构称为sub -α织构 ,表示固溶体中存在游离碳 ;润滑较差的织构称为高斯织构(Goss) ,表示带钢表面出现剪切应变 ;H织构表示变形量太大 ,表示不可能取消退火。奥氏体热轧材的晶粒细小 ,通常屈服强度较高 ,但成型性不均匀。铁素体轧制的低碳钢… 相似文献
10.
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
11.
Y.C.Wang Y.S.Li M.C.Zhao K.Yang 《金属学报(英文版)》2005,18(2):121-128
The transformation productions of hot-deformation simulation experiments were investigated using a Gleeble-1500 hot simulator for a commercial pipeline steel. Based on the investigation results, the improved thermo-mechanical control processing (TMCP) schedules containing a two stage multi-pass controlled rolling coupled with moderate cooling rates were applied to hot rolling experiments and acicular ferrite dominated microstructure was obtained. Microstructures and mechanical properties of hot rolled plates were related to TMCP processing, and regression equations describing the relation between processing parameters and mechanical properties in the current TMCP were developed, which could be used to predict mechanical properties of the experimental steel during commercially processing. It was found that with an increase in cooling rate after hot rolling, grain size in the microstructure became smaller, the amount of polygonal ferrite decreased and acicular ferrite increased, and accordingly mechanical properties increased, 相似文献
12.
Y. Chen X. Chen C.Y. Li X.Y. Li Y.L. KangTechnical Center of Wuhan Iron Steel Group Co. Wuhan ChinaWuhan University of Science Technology Wuhan ChinaCentral General Iron Steel Research Institute Beijing ChinaU 《金属学报(英文版)》2002,15(3):324-330
1.IntroductionHotrolled deep drawing steels have been developing to partially replace cold-rolleddeep drawing steels to ma协 automobile parts for reducing cost In Industry these years.In general,beneficial texture{111}for deep dr。ability wajs formed I 相似文献
13.
14.
15.
Y.T. Zhang D.Z. Li Y.Y. LiInstitute of Metal Research The Chinese Academy of Sciences Shenyang China Manuscript received December in revised form February 《金属学报(英文版)》2002,15(3):267-271
1.I尬roductlonThe dewlopment of mathematical model to predict the inal room temperature proper-ties ofhot-rolled steels hajs received consider劝ie attention over the past t侧 decades[1一31.These models contain equations to calculate the mlcrostructure 相似文献
16.
17.
18.
Zhaodong Wang Yanhui Guo Xianghua Liu Guodong Wang Peng Zhang 《Journal of Materials Engineering and Performance》2006,15(6):646-650
The recrystallization textures and drawability in an interstitial-free (IF) steel were investigated as a function of cold
rolling reduction. The hot bands for further cold rolling were obtained by lubricated hot rolling in the ferrite region. The
orientation distribution function (ODF) was applied to analyze recrystallization textures. Texture analysis showed that hot
bands rolled in the ferrite region had strong {111}//ND texture component. The {111}//ND recrystallization texture of the
cold rolled steel with 73% reduction displayed the highest intensity, but weakened as more cold work was introduced. The highestr-value was obtained at a cold reduction of 73% when the hot band was previously rolled in the ferrite region. 相似文献
19.
采用双相区(α+γ)轧制及双相区短时保温处理相结合的方式,制备了一种高强高韧性低碳低合金铁素体/马氏体双相钢,并采用SEM、室温拉伸试验和维氏硬度检测等手段研究了不同轧制工艺对铁素体/马氏体双相钢组织和性能的影响。结果表明:相对于普通的连续轧制工艺,等温轧制和道次之间短时保温处理相结合的工艺对铁素体/马氏体双相钢的相比例、形貌和尺寸有重要影响。等温轧制及短时保温处理的双相钢的组织明显细化,马氏体相比例增加,组织均匀性显著改善,屈服强度提升了34%,达到1229 MPa,屈强比高达0.78,断口为韧性断口特征,呈细小韧窝状,具有良好的综合力学性能。 相似文献
20.
A pilot hot strip rolling and cooling test that simulates an actual hot strip rolling and continuous cooling process was performed. We then examined the effect of cooling rates ranging from 0.1 °Cs?1 to 100 °Cs?1 on the microstructure and mechanical properties of high strength interstitial-free (IF) steels containing 0.003 wt% of boron, 0.0005 wt% of boron and no boron. The mechanical properties and microstructures of the boron-added high strength IF steels were analyzed using uni-axial tensile test and electron back-scattered diffraction (EBSD) following the pilot hot strip rolling and cooling test. Results show that the microstructure of high strength IF steel with no boron is influenced significantly by cooling rates. There is a critical cooling rate for building up polygonal ferrite (PF) grains. PF grains do not occur when high strength IF steels with a boron content of 0.0005 wt% and 0.003 wt% undergo a cooling rate of 5.0 °Cs?1, however widmanst?tten ferrite (WF), granular ferrite (GF) and quasi-polygonal ferrite (QF) grains are present. Under the same hot rolling and slow cooling conditions, high strength IF steel with no boron has recrystallized PF grains. On the contrary, high strength IF steel with boron cooled at above 3 °Cs?1 doesn??t have GF or QF grains, and subsequently generates the unrecrystallized ferritic grains and WF grains, which increase the yield and tensile strengths. It is deduced that we need to control both the cooling rate and coiling temperature when boron-added high strength IF steel sheet is manufactured in an actual hot strip rolling mill. 相似文献