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1.
以包钢CSP工艺生产的5.0 mm热轧板在实验室分别压下到1.75,1.25和0.75 mm冷硬板为原料,在实验室模拟了包钢罩式退火工艺,观察了不同压下率试样的显微组织.实验表明,通过观察罩式退火过程中试样的组织的变化,确定了再结晶开始温度在540℃左右,再结晶终了温度为700℃左右.并用X射线检测了试样在热轧和成品两个阶段的织构.结果表明,随着冷轧压下率的增大,再结晶进行的速度增:大,成品试样的织构密度增大,织构类型以{111}<110>和{111}<112>织构为主,但两者织构密度相差不大.  相似文献   

2.
以薄板坯连铸连轧(CSP)工艺供基料的现场两种冷轧压下率的低碳钢板为原料,实验室采用两种不同升温速度的退火工艺模拟了现场罩式退火工艺过程,分析了冷轧压下率和退火升温速度对钢板组织和微区织构的影响.结果表明,冷轧压下率较大的CSP低碳钢板在退火过程中再结晶开始的较早,其成品晶粒尺寸相对较大;慢速升温有利于再结晶的进行,并可以抑制成品{112}<110>取向的含量.  相似文献   

3.
通过极图分析方法研究了冷轧压下率(80% ̄90%)对Nb+Ti处理的ELC-BH钢板冷轧和退火织构的影响。结果表明,冷轧和退火织构的基本特性与冷轧压下率无关,冷轧压下率增大对于退火织构的有利组分与不利组分的强度比影响不大。  相似文献   

4.
冷轧压下率对钢板退火组织影响的模拟   总被引:1,自引:1,他引:0  
采用基MonteCarlo方法和简化的物理模型所编制的程序较好地模拟了冷轧压下率对钢板连续退火组织变化规律的影响,实现了常规金相组织实验所无法显示的连续退火组织的原位动态变化过程,试验所得变化规律与模拟结果相同。  相似文献   

5.
通过极图分析方法研究了冷轧压下率(80%~90%)对Nb+Ti处理的ELC-BH钢板冷轧和退火织构的影响.结果表明,冷轧和退火织构的基本特性与冷轧压下率无关,冷轧压下率增大对于退火织构的有利组分与不利组分的强度比影响不大.  相似文献   

6.
采用EBSD分析方法,对CSP试验钢冷轧板退火过程中组织转变和再结晶织构的演变进行分析,结果表明,试验用钢的再结晶过程属于定向形核理论,试验钢的再结晶形核阶段在{111}112冷轧基体上形成了{111}110和{110}100再结晶形核,在{111}110变形晶粒晶界形成{111}112新晶粒核心,{111}112和{111}110织构相互生成.在晶粒长大阶段消耗的大量的{100}110织构,且生成了{112}110织构.  相似文献   

7.
对包钢CSP热轧板进行了冷轧及退火,利用显微镜观察了试样的织构蚀坑,并进行了硬度测试.结果表明,对于同一试样,在1/4厚度处的{111}织构明显比1/2厚度处的多,且在1/2厚度处{100}织构有明显的增加;当退火工艺与试样厚度位置等条件都相同时,试样的{111}/{100}织构的线密度比值随冷轧压下率增大先上升后下降,在67%时达到最大值,与有利{111}织构组分变化相同;压下率相同时,保温时间越长,线密度{111}/{100}的值越大,有利织构组分越大,从而深冲性能越好.  相似文献   

8.
采用基于MonteCarlo方法和简化的物理模型所编制的程序较好地模拟了冷轧压下率对钢板连续退火组织变化规律的影响,实现了常规金相组织实验所无法显示的连续退火组织的原位动态变化过程.试验所得变化规律与模拟结果相同.  相似文献   

9.
对CSP基板轧制的冷轧薄板试样进行不同温度、时间下的等温退火试验,观察等温退火后试样的硬度变化,研究CSP基板轧制的冷轧薄板在不同压下率下的再结晶动力学特性,确定冷轧压下率对冷轧薄板再结晶动力学的影响。试验结果表明,随冷轧压下率的提高,再结晶温度降低。  相似文献   

10.
介绍了蚀坑的形成机理、试样制备,并用蚀坑法检测了包钢CSP条件下冷轧低碳深冲钢板的退火织构.结果表明,试样不同厚度处的织构组分不同;本实验中退火温度为700 ℃,保温时间为30 min为最佳退火工艺.  相似文献   

11.
In comparison with conventional production for hot strips, compact strip production (CSP) brings about some new micro-structural phenomena. Investigations were carried out to clarify the grain refinement mechanism of low carbon steel strips produced by the EAF-CSP process. Samples, obtained from the same rolling stock during continuous rolling, were examined through SEM,TEM and XEDS. Thin slabs have a dominant columnar structure and the spacing of the secondary dendrite arms ranges from 90 to ~125 μm. The average grain sizes for the central area of the samples from the 1st to 6th pass are 41.6, 25.2, 21.4, 20.2, 13.1, 6.7 μm,respectively. Large number of nanometer oxide and sulfide have been found in the low carbon steel produced by the CSP process.The grain refinement mechanism can be summarized as follows: finer solidification structure of the thin slab; austenite recrystalliza-tion at higher temperature and stain accumulation at lower temperature caused by the great reduction of single rolling pass during continuous rolling; nano-scaled precipitates of sulfide and oxide which drag grain boundaries of austenite or ferrite to prevent the grain coarsening.  相似文献   

12.
On the basis of the effect of carbon precipitation on the microstructure and properties of steel products below At temperature, a new thermal treatment method (temper-rapid cooling process) was studied. By the temper-rapid cooling process, the yield strengths of the high strength low carbon (HSLC) steel ZJ330 and SPA-H produced using the compact strip production (CSP) process increased from 340 to about 410 MPa and from 410 to about 450 MPa, respectively. The results indirectly indicated that there existed nanoscaled iron-carbon precipitates that have obvious precipitation effect on low carbon steel produced by CSP. The prospect of application is discussed.  相似文献   

13.
Q235钢CSP轧制时动态再结晶行为研究   总被引:1,自引:0,他引:1  
利用Gleeble-1500热模拟实验机研究Q235钢连铸坯CSP轧制时在高温变形过程中的动态再结晶行为。结果表明,在高变形温度和低应变速率条件下Q235钢易发生动态再结晶;在回归相应的数学模型后,建立了Q235钢的热变形方程式。对Q235钢连铸坯热变形后的组织进行分析,发现奥氏体发生动态回复后转变的铁素体组织中也有动态再结晶晶粒。  相似文献   

14.
The microstructures of low carbon steel before, during and after rolling deformation of each stand were observed using optical microscope. The result showed that the microstructures were very fine after six passes rolling deformation. The effect of the first stand reduction on microstructure refinement was very distinct. During the rolling process, with the increase of the accumulated strain, the microstructures would further refine, and the density of dislocation would increase at the same time. In continuous casting thin slabs and each finishing stand, lots of observed precipitates were mainly A12O3 and MnS along the grain boundaries or in grains,which played an important role in the mechanical properties of the hot strips of low carbon steel produced by CSP (compact strip production) technology.  相似文献   

15.
In order to further investigate how cold rolling texture is produced in an extra low-carbon and high strengthbake-hardening sheet steel (for short, hereafter, coiled ELC-BH sheet) with r value as high as 2.67, texture change intexture pretreatment and its effects on the cold rolling texture are researched by means of Orientation Distribution Funchon (ODf) method. Experimental results show that the cold rolling texture which Produces very strong {111 } annealing texture actually is caused by texture change in the texture pretreatment, and the strong {111 } texture obtainedrough this texture pretreatment is an essential condition of engendering the cold rolling texture, while the stability of{111 } texture components in cold rolling is a sufficient condition of emerging thes one.  相似文献   

16.
通过对某钢厂CSP轧制区生产工艺特点的分析,得出带钢温度下降的主要因素为水冷,由此建立基于水冷的带钢温度模型,并利用现场数据回归得到了综合水冷系数。将带钢温度预测值与设定值进行比较,发现水冷带钢温度模型可满足带钢温度设定要求。  相似文献   

17.
Effect of controlled rolling and cooling process on the mechanical properties of low carbon cold forging steel was investigated for different processing parameters of a laboratory hot rolling mill. The results show that the specimens with fast cooling after hot rolling exhibit very good mechanical properties, and the improvement of the mechanical properties can be attributed mainly to the ferrite-grain refinement. The mechanical properties increase with decreasing final cooling temperature within the range from 670 °C to 570 °C due to the finer interlamellar spacing of pearlite colony. The specimen with fast cooling after low temperature rolling shows the highest values of the mechanical properties. The effect of the ferrite grain size on the mechanical properties was greater than that of pearlite morphology in the present study. The mechanical properties of specimens by controlled rolling and cooling process without thermal treatment were greatly superior to that of the same specimens by the conventional rolling, and their tensile strength reached 490 MPa grade even in the case of low temperature rolling without controlled rolling. It might be expected to realize the substitution medium-carbon by low-carbon for 490 MPa grade cold forging steel with controlled rolling and cooling process.  相似文献   

18.
采用元胞自动机方法对CSP流程冷轧低碳钢再结晶过程进行模拟研究。结果表明,冷轧变形量为71.4%的CSP流程冷轧低碳钢的再结晶开始温度为540℃左右,再结晶结束温度为600-620℃;计算机模拟得到再结晶完成温度为604℃,再结晶完成时间为96 min;再结晶完成时,其晶粒平均直径为7.0μm,而晶粒尺寸分布主要集中在2-14μm,此类尺寸晶粒约占晶粒总数的90%,且具备了Weibull分布函数的特征。同时冷轧低碳钢再结晶完成时,{111}〈110〉和{111}〈112〉织构组分的含量最高,总计为63.12%,{110}〈110〉和{112}〈110〉织构组分的含量则分别为9.67%和7.6%,而{001}〈110〉织构组分的含量最低。  相似文献   

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