首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
针对铁素体不锈钢拉伸后的表面起皱现象,研究了再结晶晶粒取向分布对起皱程度的影响.将厚度3mm的430铁素体不锈钢热轧退火板,经2种工艺(一次冷轧、多次冷轧)轧制和再结晶退火后得到最终厚度均为0.1mm的冷轧板,分析了再结晶晶粒取向、轴向拉伸后表面起皱程度以及二者的相关性.结果表明,{211)〈011〉和{100}〈011〉取向晶粒的存在是引起表面起皱的内因;铁素体不锈钢中各个晶粒取向均匀分布,削弱了塑性各向异性,从而抑制起皱的产生.铁素体不锈钢在拉伸变形后,相近取向的相邻晶粒表面呈现单滑移痕迹,这是形成起皱的主要原因.多次冷轧-中间退火为减轻铁素体不锈钢表面起皱提供了一种新途径.  相似文献   

2.
    
In order to study the formation of ridging in ferritic stainless steel (FSS) sheets, the evolution of the crystallographic texture was investigated by macro and micro‐texture measurements throughout the thickness of the sheets. The as‐received hot band material displayed a pronounced through‐thickness texture gradient with a strong rotated cube orientation in the sheet center layer. The initial texture of the hot band had a high impact on the formation of the cold rolling texture and on the final recrystallization texture. Modification of the cold rolling texture by means of cross‐rolling led to an improvement of the macro and micro‐textures after final recrystallization annealing, which gave rise to an enhanced sheet formability in FSS. Tensile tests of specimens with half thickness revealed that ridging formed in the sheet center was much stronger than that in the surface. This observation was attributed to the more frequent formation of orientation colonies in the sheet center when compared to the sheet surface.  相似文献   

3.
利用EBSD技术研究了不同热轧温度下436不锈钢热轧织构的变化规律和显微组织特征.试验中选取不同的热轧初轧和终轧温度:分别在1 080和1 050℃开轧,850和800℃终轧.结果表明:较低温下开轧、终轧晶粒内部的缺陷较多,表现为较大的累积取向差,而较高温度下开轧、终轧其累积取向差明显低于低温热变形下的样品;在较高温条...  相似文献   

4.
通过金相和EBSD等技术,研究了不同热轧终轧温度对SUS444铁素体不锈钢表面抗起皱性能的影响,讨论了热轧退火板表层所产生{110}001高斯织构的演变过程及其对抗起皱性能的影响。结果表明,860℃的终轧温度有利于SUS444铁素体不锈钢热轧及退火过程中由于受剪切应变而形成的{110}001高斯织构的形成,从而提高后续冷轧退火板表面的抗起皱性能。  相似文献   

5.
讨论了即将建在海湾地区的第1个不锈钢冷轧厂的有关投资准则,重点包括影响工厂的初始投资成本以及运行成本的因素,所有这些与选择可生产高质量产品的设备有关.本项目代表着海湾投资公司在大型项目投资建设方面向前迈进了一大步.海湾公司将这一全部交钥匙项目建设合同交给达涅利公司本身就表明双方的相互信任.这种相互信任是两家公司在项目执行运作过程建立起来的.目前已经组建了1家新公司来经营和运作新建的冷轧厂,这家公司就是联合不锈钢公司(USCO).  相似文献   

6.
7.
 马鞍山钢铁股份有限公司第4炼轧厂有300t复吹转炉2座,投产初期生产不正常。通过改进氧枪喷头参数,开展转炉炼钢的基础研究,优化吹氧、造渣制度和规范吹炼操作等措施,经过2年多的生产实践,使转炉炼钢操作正常化,能够满足生产低碳优质深冲钢的技术要求。  相似文献   

8.
凝固组织对超低碳铁素体不锈钢皱褶和深冲性的影响   总被引:1,自引:0,他引:1  
为了研究凝固组织对超低碳铁素体不锈钢成形性的影响,采用XRD和SEM等分析手段详细研究了材料的皱褶和深冲性能。研究发现:相对于等轴晶的试样,柱状晶试样展示了更高的皱褶高度,这主要同柱状晶试样中存在明显的晶粒簇有关;经最终的再结晶退火后,等轴晶试样也展示了更好的深冲性能,这同等轴晶试样形成了强烈的γ纤维织构紧密相关。  相似文献   

9.
    
Samples of a ferritic stainless steel sheet were hot‐rolled with and without application of lubrication. The effect of the different hot rolling processes on the evolution of texture and microstructure after hot rolling, cold rolling and subsequent recrystallization annealing was studied by means of macro and micro‐texture analysis and microstructure observations. After hot rolling, the sample rolled with lubrication displayed uniform rolling textures through the sheet thickness, while the sample rolled without lubrication showed shear textures in the outer layers of the sheet. The finite element method was employed to reveal the strain states during hot rolling with and without lubrication. The texture of the hot rolled sheet strongly influenced the formation of texture after cold rolling and final recrystallization and, therewith, planar anisotropy as well as the severity of ridging of the final gauge sheet. Hot rolling with lubrication was beneficial to the formation of strong recrystallization textures through the whole thickness layers leading to an enhanced planar anisotropy of the sheet. The recrystallized sheet hot‐rolled without lubrication displayed less severe ridging, however, which was attributed to a less frequent formation of orientation colonies in the outer thickness layers of the sheet.  相似文献   

10.
李秋鹤  王刚  陈礼清 《钢铁》2016,51(10):41-47
 采用X射线衍射技术和光学显微分析等方法,研究了同步和异步冷轧方式对SUS430铁素体不锈钢微观组织、织构演变以及力学和成形性能的影响。结果表明,与同步冷轧相比,由于异步轧制剪切变形的引入,可使异步冷轧板材的平均晶粒尺寸减小。在同步冷轧过程中,其二次冷轧再结晶织构为完整的γ纤维织构,导致铁素体不锈钢的最终性能优于同步一次冷轧;而在异步冷轧过程中,异步一次冷轧再结晶织构为强点{111}<[1][1]2>的γ纤维织构,异步二次冷轧再结晶织构属于随机取向织构,其结果是异步一次冷轧板材的性能优于异步二次冷轧。综合分析表明,与异步二次冷轧方式相比,同步二次冷轧方式有利于铁素体不锈钢性能的提高。  相似文献   

11.
 采用X射线衍射技术(XRD)研究了不同冷轧压下量对亚稳态奥氏体不锈钢00Cr17Ni7织构的影响,分析了亚稳态奥氏体不锈钢00Cr17Ni7中马氏体相和奥氏体相的织构变化情况。研究结果表明,不同冷轧压下量下,00Cr17Ni7中的奥氏体相织构主要由Brass{110}<112>、Goss{110}<001>和少量的Copper{112}<111>、S{123}<634>组成,并且随着压下量的增加Brass和Goss织构强度显著提高;同时马氏体相织构主要以{115}<110>、{112}<110> 、{111}<112>、{332}<113>组成,织构的形成主要归因于“Kurdjumov-Sachs取向关系”和“体心立方金属轧制织构类型演变的特点”共同作用的结果。  相似文献   

12.
 通过对00Cr17Ti经热带退火、不经热带退火两种工艺的冷轧板进行对比试验,在分析显微组织、织构的基础上,研究了热带退火对00Cr17Ti薄板表面皱折的影响。研究结果表明:与不经热带退火相比,经热带退火能使成品薄板的表面皱折大大减轻,最大粗糙度仅为12.06 μm,平均粗糙度仅为1.27 μm。两种工艺的成品板表面皱折程度的不同是由两者在显微组织、微织构上的差异造成的。与不经热带退火相比,经热带退火的成品薄板在板厚方向具有较均匀的组织,板宽方向的织构梯度较小,晶粒簇较间断、细窄、分散,所有这些使得成品薄板的表面皱折大大减轻。为了满足用户对薄板表面质量的严格要求,对热轧带进行退火是很有必要的。  相似文献   

13.
Emulsion,obtained by cationic emulsifiers,allows much larger oil droplets with narrower particle distribution,slows down the contamination from iron fines to the oil droplets,and is further enhanced with higher boundary and elastohydrodynamic lubrication for a relatively slower rolling process but high rolling force.As a result,it is suitable for the cold rolling of stainless steel.Cationic emulsion is now applied in a 1 750 mm 5-stand tandem cold rolling mill of Baosteel to roll stainless steel and carbon steel.The production process is stable and the product quality satisfies customer requirements.  相似文献   

14.
对无抑制剂取向硅钢不同压下率下初次再结晶退火后的显微组织、宏观织构和微观织构进行了研究.结果表明,冷轧板织构主要为α取向线{001}<110>、{112}<110>和{111}<110>织构以及γ取向线{111}<110>织构.初次再结晶退火后,α取向线织构减弱,织构主要为γ取向线{111}<112>织构.随冷轧压下率的增加,冷轧和初次再结晶织构强度增加.当压下率为88%时,初次再结晶退火后 Goss 织构和{111}<112>织构强度最高,最有利于发生二次再结晶.EBSD 分析显示,Goss 取向晶粒大多与{111}<112>取向晶粒相邻.提高冷轧压下率,Goss取向晶粒和{111}<112>取向晶粒都增加,Goss 取向晶粒偏离理想取向角度减少.  相似文献   

15.
    
The microstructure of a duplex stainless steel slab 1.4362 produced by continuous casting has been investigated by optical microscopy, scanning electron microscopy, EBSD and EDS. The slab showed different macrostructures through the thickness. The macrostructure can be divided into 3 types: fine equiaxed, columnar and coarse equiaxed grains. In all three regions, the volume fraction of each phase austenite and delta‐ferrite is close to 50% and the hardness is very similar for both. The austenite has Kurdjumov‐Sachs or Nishiyama‐Wassermann relationship with the delta‐ferrite. The slab does not show a strong segregation profile through the thickness. The delta‐ferrite is enriched in Cr and Mo, while austenite is enriched in Ni and Mn.  相似文献   

16.
17.
采用热挤压和冷轧工艺生产HR3C无缝钢管,金属冷成型过程和成品性能均表明热挤压加冷轧工艺生产高合金难变形材料具有明显优势.热挤压加工变形时金属承受三向压应力,可以提高金属的综合性能;通过冷轧加工改善管材表面质量和尺寸精度,可以确保材料在特殊环境中使用安全性更高.  相似文献   

18.
研究“交叉轧制法”试制立方织构双取向硅钢时的冷轧压下工艺,发现冷轧纵横向压下率比对成品磁性能的影响很大。当纵横向冷轧压下率比控制在1.380-1.450时,最利于最终成品中强而锋锐的立方织构{100}〈001〉形成。  相似文献   

19.
  总被引:1,自引:0,他引:1  
 Texture evolution of ferritic hot rolled Ti-IF steel was investigated during cold rolling in the reduction from 15% to 85%. It was found that, α fibre intensified monotonously with the increase of the cold reduction, but γ fibre changed in a different way. As the cold reduction was in the range of 15%-35% or 45%-75%, γ fibre intensified. While the reduction was between 35%-45% or 75%-85%, the intensity of γ fibre reduced. γ fibre displayed the maximum intensity at 75% and the highest average plastic strain ratio due to the favorable recrystallization texture was obtained at this point.  相似文献   

20.
结合现场生产实际,通过在试验室对奥氏体不锈钢304黑皮卷直接进行压下率分别为10%,20%,30%的冷轧然后退火酸洗的试验,证明在退火酸洗工艺相同的情况下,通过在热轧后进行一定压下率的直接轧制,可以获得与传统No.1产品相比晶粒尺寸等级相同、表面粗糙度更低、力学性能和耐蚀性相近的2E产品,并且获得更大的热轧产品厚度范围,降低冷轧一个轧程后的产品厚度.因此根据不同客户的要求,可以用2E产品替代No.1产品.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号