一种ELC-BH钢板退火组织演变的Monte Carlo模拟

基于Monte Carlo方法所建立的退火模型,以一种含Nb的冷轧超低碳高强度烘烤硬化钢板(简称ELC-BH钢板)为研究对象,进行了退火组织演变的模拟和实验研究。结果表明:模拟结果较好地反映了ELC-BH实验板退火组织演变过程,特别是展示了回复阶段再结晶孕育期,证实了该模型的合理性和实用性;考虑升温、亚晶形成、析出相粒子等影响来进一步改进模型,可改善其实用效果。     

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 通过采用不同的润滑条件、压下率、退火温度,研究了DC03冷轧微碳钢冷轧和退火过程沿钢板厚度方向织构的形成和演变机制,结果表明冷轧时使用全润滑轧制,当压下率为75%,退火温度为750 ℃时,可得到最佳的r值。     

IF钢织构与晶界特征分布的研究

对IF钢板的罩式退火(BA)和连续退火(CA)工艺进行了模拟实验，并运用EBSD技术对两种IF钢板的织构、晶界特征分布及其与二次加工脆性之间的关系进行了研究．结果表明，两种不同退火工艺的IF钢板在织构和晶界特征分布上存在很大的差异：(1)连续退火IF钢板呈现强烈的{111}再结晶织构，它由{111}(110)和{111}(112)两类取向晶粒组成；罩式退火IF钢板的{111}再结晶织构相对较弱，且主要由{111}(110)组成；(2)连续退火IF钢板中含有较多的∑3，∑13，∑9和∑11重位晶界，而罩式退火的IF钢板中只含有∑3和∑13重位晶界；(3)连续退火IF钢板中低能晶界与高能随机晶界均匀分布，而罩式退火IF钢板中低能晶界成团集中分布，高能晶界分布在团簇周围构成粗大的网状，这是IF钢板产生二次加工脆性的重要原因。     

单机架可逆冷轧过程中不同厚度规格低碳铝镇静钢的组织性能

采用铜丝定点标记法,研究了H-C单机架可逆冷轧低碳铝镇静钢过程中的变形规律,通过单向拉伸实验检测不同厚度规格钢板力学性能,利用光学显微镜观察实验钢板冷轧态及退火态的显微组织,并用电子背散射衍射仪(EBSD)测量了两种厚度实验钢板取向织构情况。结果表明,可逆冷轧过程中沿断面高度方向上各处金属质点流动速度相同,没有明显的剪切变形。试样压下率从34%升高到80%时,r值范围为1.13~1.36,n值范围为0.23~0.24。压下率从64%升高到80%时,退火试样再结晶组织中有利的111∥ND取向晶粒所占比例增加,对深冲性能有利。     

电冰箱侧板用冷轧钢板锈蚀原因分析

对电冰箱侧板用冷轧薄板磷化处理前的腐蚀问题进行了研究,比较不同工艺段（清洗前,清洗后,罩式退火后和连续退火后）钢板的耐蚀性。结果表明,罩式炉退火过程中退火温度过高,退火时间过长,造成钢板表面Mn元素富集,主要成分为氧化锰,析出的氧化锰与金属Fe构成了腐蚀微电池,使钢板表面Fe原子的活性增强,从而降低钢板的耐腐蚀性。     

薄规格工具钢SK95的生产实践及组织性能

在薄板坯连铸连轧产线生产薄规格SK95钢,并对不同厚度的热轧态钢板和经过软化退火、冷轧及球化退火后钢板的组织、力学性能、球化效果进行研究。结果表明,热轧态钢板的组织以片层珠光体为主,与2.5 mm钢板相比,1.8 mm热轧态钢板的珠光体片层间距减小约100μm,脱碳层减小0.01 mm,且无网状碳化物,抗拉强度高约70 MPa,1.8 mm软化退火态钢板球化率增加20%,抗拉强度降低约40 MPa,伸长率从21%提高至23.5%;而冷轧后球化退火态钢板较软化退火态钢板抗拉强度降低约80 MPa,伸长率从23.5%提高至35%。     

日本钢管公司开发水淬连续退火技术

过去,冲压成形用冷轧钢板的退火一直采用分批式退火方式。退火时间长,自动化困难,难以制造加工用的高强度纲板。另外,连续退火方式也不能用于生产冲压成形用冷轧钢板。其主要原因是钢中碳化物在退火时溶入基体中,成为固溶碳,而这种固溶碳因连续退火的冷却速度快,故在冷却过程中不能充分析出,在使用钢板时会引起时效恶化。     

高强度镀锌用冷轧薄板再结晶温度及性能研究

在连续退火模拟试验机上对低碳冷轧钢板进行退火,研究在不同化学成分、不同退火温度和退火时间下显微组织的演化过程,并分析了退火工艺对钢板硬度和拉伸性能的影响。结果表明,随着C、Mn含量的增加,溶质原子拖曳和第二相析出阻碍了晶粒长大,钢板的再结晶温度升高;增加退火时间,再结晶速度降低,再结晶温度略有下降。根据试验结果进行工业试制,高强度镀锌钢卷力学性能达到标准要求。     

高强度钢板在连续热镀锌中的选择性氧化分析

综述了高强度钢板在连续热浸镀锌线上再结晶退火过程中产生的选择性氧化现象,详细探讨了钢板的成分、退火气氛的露点和成分、退火的温度和时间等对选择性氧化的影响,以期对了解高强度钢板的选择性氧化和改善其热镀锌性能提供参考.     

汽车用冷轧超低碳烘烤硬化钢板的组织性能与析出

实验研究了汽车用冷轧超低碳烘烤硬化钢板的成分、热轧冷轧及退火工艺对钢组织性能的影响规律,并分析了冷轧后连续退火和罩式退火不同条件下钢中析出第2相粒子形态和钢板的织构变化。     

Analysis of Bonding Behavior and Critical Reduction of Two-Layer Strips in Clad Cold Rolling Process

In recent years, two-layer metallic sheets have been increasingly used in various industries to create combined functions. Among cladding methods, the cold rolling is most widely used in producing bimetallic sheets. In this research, to thoroughly provide guidelines for cold rolling of bimetal strip, an attempt has been made to develop an analytical model based on upper bound method. Also, the bonding strength and critical reduction were calculated using upper bound theorem and the finite element simulation was used for Al/St bimetallic strip. Finally, an experimental study was run for our model to be verified analytically and numerically. Results show that the bonding strength of strips increases with increasing the total thickness reduction of bimetal strips and because of subsequent occurrence of strips bonding in roll gap, increasing the yield strength of base layer gives rise to critical reduction. Through the study, it becomes clear that the proposed analytical model is applicable for simulating the cold rolling process of the two-layer strips and is capable to broaden our knowledge in manufacturing and production of bimetal strips and sheets.     

冷轧薄板再结晶温度研究

在冷轧薄板的生产过程中,金属晶粒将沿着变形方向被拉长。这种变化将导致力学性能等的变化。再结晶退火是冷轧薄板生产过程中的一个重要过程。因此研究冷轧薄板再结晶温度以及压下率对再结晶温度的影响,对冷轧薄板生产具有重要的实际意义,能够为冷轧薄板生产时退火工艺制度的制定提供理论依据。     

冷轧薄板再结晶温度研究

在冷轧薄板的生产过程中,金属晶粒将沿着变形方向被拉长.这种变化将导致力学性能等的变化.再结晶退火是冷轧薄板生产过程中的一个重要过程.因此研究冷轧薄板再结晶温度以及压下率对再结晶温度的影响,对冷轧薄板生产具有重要的实际意义,能够为冷轧薄板生产时退火工艺制度的制定提供理论依据.     

冷轧工艺对301L不锈钢组织及性能的影响

对1.5 mm厚的301L不锈钢板材进行多道次冷轧试验,得到压下率分别为20%,30%,40%的板材;通过对冷轧板材的拉伸试验、金相分析、SEM分析、XRD衍射分析及硬度测试,研究冷轧压下率对301L不锈钢组织及性能的影响规律。研究表明,随着冷轧压下率的增大,301L不锈钢中的应变诱发马氏体会逐渐增多,材料的屈服强度由789 MPa提高至1260 MPa,抗拉强度由977 MPa提高至1317 MPa,显微硬度则提高了120 HV;材料出现晶粒碎化现象,产生细晶强化;同时,由于301L不锈钢中的马氏体相变,20%压下率的301L不锈钢拉伸应变硬化指数要高于30%压下率的301L不锈钢。     

唐钢冷连轧低碳薄板深冲性能的研究

采用唐山钢铁股份有限公司FTSR连铸连轧生产线生产的热轧卷作为生产冷轧低碳钢板的原料，研究了不同卷取温度和冷轧压下率对冷轧薄板深冲性能的影响。结果表明，采用低温卷取有利于提高钢板的深冲性能。以3．5mm厚和2．5mm厚热轧板为原料的冷轧低碳钢板的r值分别在冷轧压下率为70．2％和71．3％时出现峰值。生产厚度大于等于0．8mm的低碳钢板时应采用3．5mm厚的热轧卷，生产厚度小于0．8mm的冷轧板时应采用2．5mm厚的热轧卷。     

润滑对3104铝合金板变形织构的影响

在无润滑(WOL)和润滑(WL)2种轧制条件下,分别对2.3 mm厚的热轧3104铝合金板进行不同压下量的冷轧.应用取向分布函数(ODF)定量计算和分析在不同轧制压下量下润滑对3104铝合金板材沿板厚方向织构演变的影响.结果表明:随着轧制压下量的增加,样品各层的织构组分强度均逐渐增加;无润滑轧制时样品表面层主要织构组分取向密度普遍高于相同压下量下润滑轧制时的取向密度.导致表面层织构组分增强的原因是摩擦引起应变状态改变的结果.     

Formation mechanism and control of aluminum layer thickness fluctuation in embedded aluminum–steel composite sheet produced by cold roll bonding process

The influences of rolling reduction and aluminum sheet initial thickness (AIT) on the thickness fluctuation of aluminum layer (TFA) of embedded aluminum–steel composite sheet produced by cold roll bonding were investigated, the formation mechanism of TFA was analyzed and method to improve the thickness uniformity of the aluminum layer was proposed. The results showed that when the reduction increased, TFA increased gradually. When the reduction was lower than 40%, AIT had negligible effect on the TFA, while TFA increased with the decrease of AIT when the reduction was higher than 40%. The non-uniformities of the steel surface deformation and the interfacial bonding extent caused by the work-hardened steel surface layer, were the main reasons for the formation of TFA. Adopting an appropriate surface treatment can help to decrease the hardening extent of the steel surface for improving the deformation uniformity during cold roll bonding process, which effectively improved the aluminum thickness uniformity of the embedded aluminum/steel composite sheets.     

An Analytical Modified Model of Clad Sheet Bonding by Cold Rolling Using Upper Bond Theorem

In this paper, clad sheet bonding by cold rolling was investigated using the upper bond theorem. Plastic deformation behavior of the strip at the roll gap was investigated, unlike previous methods; distinctive angular velocities are used for different zones in roll gap in present model and absolute minimum of rolling power function is achieved. Rolling power, rolling force, and thickness ratio of the rolled product affected by various rolling condition such as flow stress of sheets, initial thickness ratio, roller radius, total thickness reduction, coefficient of friction between rollers and metals and between components layer, roll speed, etc., are discussed. It was found that the theoretical prediction of the thickness ratio of the rolled product, rolling force, and rolling power are in good agreement with the experimental measurement.     

Textures variation of 3104 aluminum alloy sheets under different rolling conditions

1　INTRODUCTIONLargequantityoftheAl Mn Mgalloy 310 4isusedinthemanufactureofaluminumbeverage .Muchattentionwaspaidtothecontroloftextureandearinginthedeepdrawingstagesofmanufacture .Thetex tureinthecanstockwasextensivelyinvestigated .Oneearingofaluminumalloyisverycloserelatedtothetexture ,agoodassociationofthetexturescompo nentsearingdropsobviously ,inthissituationthe 4 foldearingat 0°/90°andearingat± 4 5°occursto gether[15] .Theappearanceof 4 foldearingat 0°/90°isduetothecubetext…     

EFFECT OF THE PROCESS PARAMETERS OF CROSS SHEAR ROLLING ON ROLLED TEXTURE AND MAGNETIC PROPERTY OF THIN GRAIN ORIENTED SILICON STEEL SHEETS

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