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IF钢罩式退火与连续退火再结晶模拟试验 总被引:3,自引:0,他引:3
对IF钢罩式退火(BA)和边续退火(CA)的再结晶过程进行了模拟试验与分析,结果表明:BA工艺的再结晶中晶粒有一个从饼状晶粒向等轴晶粒转变的过程;而CA工艺的再结晶过程中再结晶晶粒一开始就呈等轴状,而后逐步不断长大。 相似文献
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国外汽车用钢板开发新进展 总被引:5,自引:0,他引:5
综述了国外汽车板研究开发的新进展,重点介绍了板带热轧工艺中IF钢热轧卷取温度控制、铁素体区轧制、TRIP钢、BH钢、冷轧与退火工艺及钢板表面质量检测与控制等汽车板品种、质量研究开发的新成果。 相似文献
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超深冲IF钢退火过程中织构变化的ODF分析 总被引:5,自引:0,他引:5
采用ODF分析方法对IF钢冷轧板在退火过程中织构变化进行了分析。结果表明,随退火时间的延长,冷轧IF钢板在呔α,γ取向线上的{100}〈110〉,{112}〈110〉,{111}〈110〉,{111}〈112〉织构有所增减,其中{111}〈112〉织构明显增加。最终形成以{111}〈110〉,{111}〈112〉为主的退火织构。这正是使IF钢获得优良深冲性能必要条件。 相似文献
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在实验室对比模拟研究了Nb-Ti微合金化低合金高强钢的罩式退火和连续退火工艺。利用扫描电镜、透射电镜和拉伸试验机等设备,分析了不同退火工艺条件下试验钢的组织演变规律及性能变化趋势。结果表明,2种退火方式下试验钢组织中均存在纳米级Nb-Ti复合析出物,罩式退火工艺下试验钢的主要组织为铁素体+球状渗碳体,在640℃退火获得了较好的力学性能,抗拉强度为539 MPa、屈服强度为498 MPa、伸长率达到23.1%;连续退火工艺下试验钢组织为铁素体+珠光体+M-A岛,组织更加细小,细晶强化效果更好,在820℃退火时产生的链状组织提升了试验钢的力学性能,此时抗拉强度为644 MPa、屈服强度为536 MPa、伸长率达到22.7%,也可通过选取更高的退火温度实现对强度和伸长率的调节。 相似文献
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热轧工艺对IF钢析出物析出行为的影响 总被引:4,自引:0,他引:4
本文从研究无间隙原子(IF)钢热轧析出物粒子数量,尺寸及分布状态的角度出发,讨论了热轧工艺参数对析出物析出行为的影响,并分析了析出物粒子形貌对IF钢再结晶退火组织和性能所产生的作用。最后指出,热轧工艺参数对析出物的析出行为起着极为重要的作用,合理的热轧工艺是获得优异成型性能IF钢的前提。 相似文献
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连续退火工艺制度是精冲钢冷连轧生产过程中的重要环节,对其成品组织性能有着极其重要的影响。在实验室进行轧制润滑试验研究,设计了多种连续退火工艺方案,采用CAS- 300连续退火试验机模拟连续退火试验,确定了C15/2精冲钢的再结晶温度为550℃。针对不同规格冷连轧精冲带钢,通过拉伸试验和显微组织鉴定,给出了适用于冷连轧生产实践的连续退火工艺制度。结果表明,退火后试样的屈服强度控制在(310±20)MPa,抗拉强度小于450MPa,伸长率大于30%,获得了良好综合力学性能的精冲钢组织。该研究完全满足工业生产实践的需求,对精冲钢冷连轧生产退火工艺研究具有重要意义。 相似文献
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����������������ź鲨����־�裬���� 《钢铁研究学报》2015,27(12):54-57
On industrial scale, high strength P- containing IF (Interstitial Free) steels were produced with both batch annealing and continuous annealing processes and their microstructures and properties were studied. Forming abilities of the two steels were compared with commercial Al- killed steel DC01 and extreme deep drawing IF steel DC04 produced with batch annealing. The results show that the microstructures of high strength IF steels are composed of equi- axial ferrite and their mechanical properties meet the requirement of relevant standard. The batch annealed high strength P- containing steels show poorer formability than continuous annealed ones. The test results of texture and orientation distribution function (ODF) demonstrate that density of ??- fiber increases in order of batch annealed high strength P- containing IF steel, commercial DC01, continuous annealed high strength P- containing IF steel and normal IF steel DC04. 相似文献
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以传统高强度IF钢为对比,用Gleeble-1500热模拟机研究了高C-高Nb 高强度IF钢再结晶行为,采用盐浴退火方法研究了退火温度对高C-高Nb高强度IF钢显微组织和力学性能的影响。实验结果表明,高C-高Nb 高强度IF钢再结晶完成温度比传统高强度IF钢约高20℃。再结晶完成后,高C-高Nb高强度IF钢铁素体晶粒长大倾向很小,晶粒尺寸比传统高强度IF钢明显细小。盐浴退火温度在870℃以上时,高C-高Nb高强度IF钢得到铁素体和贝氏体混合组织。为了保证高C-高Nb高强度IF钢得到较好的综合力学性能,退火温度控制在810℃-830℃为最佳。 相似文献
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退火张力对连续热镀锌IF钢力学性能的影响 总被引:4,自引:1,他引:3
在Gleeble1500热模拟试验机上模拟了连续热镀锌的张力退火过程,研究了张力大小对退火后IF钢力学性能的影响。结果表明退火张务使IF钢伸长率和n值显著下降,屈服强度和抗拉强度的变化不大。 相似文献
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在IF钢的生产过程中,退火是非常关键的工艺环节。针对酒钢CSP生产的Ti- IF钢进行研究,分析了在罩式退火工艺条件下,罩式退火工艺对Ti- IF钢组织与性能的影响。结果表明:退火温度从680℃上升到750℃保温2h,试样抗拉强度从284下降到268MPa,屈服强度从114下降到96MPa,屈强比从0.40降低到0.36,伸长率从44.3%提高到47%,塑性应变比r90值从2.22升高到2.60。 相似文献
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以不同稀土含量的440 MPa高强IF钢为研究对象,在盐浴炉中模拟现场的连续退火,退火温度810℃,分别保温30 s、60 s,通过TEM与XRD对退火后的试样进行第二相分布、形状及成分分析,以研究稀土对高强IF钢第二相析出行为的影响。实验结果表明,保温时间基本不影响第二相的析出;不加稀土的高强IF钢析出的第二相呈弥散分布,且尺寸大小均匀,均在30 nm以下;加了稀土的高强IF钢析出的第二相分布在晶界处,并且伴随着团聚的现象,第二相尺寸不均匀,大颗粒在30 nm^100 nm之间;不加稀土的试验钢在810℃保温60 s下的析出相种类有FeTiP、TiC、TiN、NbN。实验结果为440 MPa高强IF钢在退火条件下第二相析出奠定了理论基础。 相似文献
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Percentage of cold rolling and mode of annealing significantly influence the formation of structures and textures of steel sheets. The objective is to co‐relate the micro‐structures and textures at each step of processing and their effect on mechanical properties. In addition, an attempt has been made to distinguish the batch and continuous mode of annealing. In the present investigation, interstitial free high strength (IF‐HS) steel was first hot rolled to 85‐90%, followed by cold rolling (CR) and then annealed. Annealing was carried out in the batch as well as the continuous mode. It was found that a fine pancake type and strong hot band texture was developed after hot rolling. Its very strong orientations were and . An almost uniform α‐fibre and γ‐fibre were developed at 80% cold reduction. After annealing, the new γ‐fibre was found to be developed replacing the old one for both modes of annealing i.e. batch and continuous. Further, it was observed that the intensity of the γ‐fibre was higher at 80% CR after continuous annealing than after batch annealing. The strain energy introduced during cold rolling could not be removed completely in batch annealing. Therefore, the drawability obtained through continuous annealing was higher than that after batch annealing. The process route of 80% CR and annealing, either in batch or in continuous mode, has developed optimum strength and drawability in steel sheets. Either batch or continuous mode can be used for annealing to cold rolled IF‐HS steel sheets, but the latter one is found to be superior to the former one. 相似文献
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