5083铝合金H2n状态板材退火工艺研究

研究了退火温度及保温时间对5083铝合金板材组织与性能的影响,退火温度对该板材抗剥落腐蚀性能的影响,板材硬度的变化规律.确定了5083-H2n板材的退火工艺制度.     

5005铝合金O和H24状态板材退火工艺研究

研究了加热温度及退火温度、保温时间对5005铝合金铸块及板材内部组织、力学性能及硬度的影响,确定了5005铝合金板材的热轧温度及O、H24状态的退火工艺制度。按照确定的工艺生产的板材性能达到了标准的要求。     

深冲用2B06-O铝合金板材的工艺研究

试验研究了退火温度、保温时间、冷却方式对2B06-O铝合金板材组织及深冲性能的影响,确定了合理的成品退火工艺制度.结果表明,按照确定的工艺制度生产的板材经用户深冲加工试验无裂纹,能满足用户的使用要求.     

退火工艺对5251铝合金板材组织及性能的影响

从5251铝合金3.0 mm厚度的热轧-中温轧制-冷轧板材切取试料,在箱式退火炉进行不同退火制度的处理,从而研究退火制度对5251铝合金板材的力学性能和电导率的影响,确定了3.0 mm厚5251铝合金板材的合理退火工艺制度,为实际生产该合金板材提供技术支持.     

5A05铝合金O状态板材质量攻关

研究了冷轧加工率、退火温度、保温时间对板材组织与性能的影响，确定了5A05铝合金O状态板材的冷轧工艺和热处理制度。按照所确定的工艺制度生产的板材，其性能达到GB／T3880-1997标准中的规定，并且板材的质量稳定。     

3003铝合金O、H24状态大卷材工艺研究

研究了退火温度、保温时间对3003铝合金板材组织与性能的影响,确定了3003铝合金O、H24状态大卷材退火热处理工艺,确定了退火工艺制度。其性能指标达到GB/T3880-1997标准的指标。     

改善5A06-O铝合金板材性能的研究

研究了冷轧加工率、退火温度、保温时间、冷却方式、镁含量等因素对板材组织与性能的影响,确定了5A06铝合金O状态板材的冷轧工艺和热处理制度。按照所确定的工艺制度生产的板材,其性能达到GB/T3880-1997标准中的规定,并且板材的质量稳定。     

5083-H321铝合金厚板生产工艺研究

研究了冷轧加工率、稳定化退火温度及保温时间对5083铝合金板材组织与性能的影响,确定了5083铝合金H321状态板材的生产工艺制度.按照确定的工艺生产的板材其性能达到标准的要求.     

提高2A12铝合金O状态板材塑性的工艺研究

从２Ａ１２铝合金的成分范围和冷轧板退火制度方面研究了提高２Ａ１２－Ｏ板材塑性的工艺，还研究了Ｔ４２状态板材的淬火工艺，确定了最佳的热处理工艺参数。     

5251铝合金H2n和O状态板材生产工艺研究

研究了中温轧制后5251铝合金板材的退火温度和保温时间对板材组织与性能的影响,确定了5251铝合金H2n和O状态的生产工艺及热处理制度.结果表明,按所确定的工艺制度生产的板材,其性能指标达到EN485标准的规定值.     

高纯Cr17钢板厚方向织构演变、成形性能及表面皱折

以高纯Cr17铁素体不锈钢为实验材料,对比研究了热轧不退火、退火两种工艺对其板厚方向织构演变、成形性及表面皱折的影响。采用金相显微镜、X射线衍射技术及背散射电子衍射技术观察两种工艺条件下的组织和织构演变。结果表明:成品板各层织构特征存在显著差异,这是由于低温轧制过程中沿板厚方向不同应变状态导致的热轧织构梯度遗传所致。与热轧不退火相比,热轧退火有利于成品板各层γ纤维再结晶织构增强,偏离{111}<112>组分的程度减弱,α纤维织构弱化;有利于弱化成品板的带状晶粒簇,促使晶粒簇分布均匀分散。     

Ra 及 Rpc 对无铬耐指纹热镀锌板表面性能的影响

目的研究热镀锌板表面平均粗糙度Ra和峰值数Rpc对无铬耐指纹热镀锌板表面耐指纹性、耐腐蚀性和涂装性的影响。方法将Ra=0.6~1.1μm和Rpc=55~100的热镀锌板制成耐指纹板,采用X射线光电子能谱仪分析其组成,采用分光光度仪分析其耐指纹性,采用硫酸铜混合溶液滴定和盐雾试验方法检测其耐腐蚀性,采用涂漆和冲击实验检测其涂装性。结果耐指纹膜和锌层表面形成Si—O—Zn金属键,耐指纹膜除了物理结合,还通过化学键合的方式与锌层表面结合。在充分交联固化和化学键合的情况下,无铬耐指纹热镀锌板耐指纹性不受热镀锌板Ra和Rpc的影响;热镀锌板Ra值越低,耐腐蚀性越好;耐指纹膜单位质量为1.1 g/m2,Ra≤1.1μm时,耐指纹板72 h盐雾试验白锈面积不大于5%;热镀锌板Rpc值越高,无铬耐指纹热镀锌板涂装性越好,Rpc≥80时,耐指纹热镀锌板涂漆冲压后,漆膜完好。结论 Ra和Rpc对热镀锌板耐指纹性影响不大,对耐磨蚀性和涂装性影响显著。     

冷轧汽车钢板发展动态

叙述近年来国外汽车用冷轧钢板的发展态势,着重介绍深冲级冷轧钢板,高强度钢板和涂镀层表面处理钢板生产工艺和性能改善方面的作用,以及汽车工业对这些钢板性能要求和应用的变化情况。     

Effect of initial texture on secondary recrystallization of grain-oriented electrical steel

The effect of initial texture before cold rolling on secondary recrystallization of grain-oriented electrical steel was investigated using thin cast sheets and conventional hot-rolled sheets as initial materials. The main texture component of the surface layer of thin cast sheets is random, while that of the hot-rolled sheets is 110 001. It was found that the optimum cold reduction for achieving a strong 110 001 texture during secondary recrystallization was 95% and 90% for thin cast sheets and hot-rolled sheets, respectively. K. Iwayama, formerly Nippon Steel Corp., Kitakyushu, Fukuoka, Japan     

卷取温度对Ti-IF钢板组织及性能的影响

利用金相显微镜(OM)及X射线衍射仪(XRD)分析研究了卷取温度对Ti-IF钢热轧基板及退火成品板微观组织和织构的影响。结果表明,在不同卷取温度下热轧基板及退火成品板晶粒尺寸呈正态分布,均表现出较强的{111}织构,主要是{111}<110>和{111}<112>织构。卷取温度对产品性能的影响比较小,工艺窗口比较大。     

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。     

Roll bonding behaviour of Al-3003/Al-4043 and Al-3003/Zn sheets

In the present study, the roll bonding behaviour of Al-3003/Al-4043 and Al-3003/Zn sheets were compared. The bi-layer sheets were produced by a roll bonding process at different reductions in thickness and rolling temperatures. The joint strengths of the sheets were evaluated by peel and bend testing before and after supplemental annealing treatment. The peeled surfaces were examined using a scanning electron microscope. The results indicated that the Al-3003/Al-4043 sheets were bonded with higher joint strength and lower threshold reductions in thickness with respect to the Al-3003/Zn sheets. In contrast to the Al-3003/Zn sheets, significant improvement was observed in the joint strength of the Al-3003/Al-4043 sheets after annealing treatment. Moreover, electron microscopy examinations showed that the fracture types of the Al-3003/Al-4043 and Al-3003/Zn sheets were predominantly ductile and brittle, respectively.     

高润滑皮膜钢板的成形特性及在汽车覆盖件中的应用

高润滑皮膜钢板通过固化手段在合金化熔融镀锌钢板(GA钢板)表面的GA层形成固态润滑皮膜,紧密附着在钢板表面,从而降低钢板的表面摩擦系数,改善润滑性能,达到提高钢板成形性、削减原材料成本的目的。本研究采取适当方法对高润滑皮膜钢板和普通GA钢板的滑动性能、拉伸性能以及胀形性能进行了对比试验,并提出以成形余裕度作为成形性的评价参数,结合在实际汽车覆盖件生产中的成形余裕度测试。结果表明:高润滑皮膜钢板的各项性能对比普通GA钢板均有较大地提高;在成形稳定性方面,对比普通GA钢板提升了60%以上。目前,高润滑皮膜钢板已经在丰田、本田等汽车制造厂中被广泛使用。     

Self-pierce riveting of multiple steel and aluminium alloy sheets

Multiple steel and aluminium alloy sheets were joined by self-pierce riveting. Self-pierce riveting is attractive for joining multiple and dissimilar sheets, because joining of individual interfaces is not necessary unlike the conventional joining processes, i.e. sheets except for a lower sheet are merely pieced with a rivet shirt. The steel sheets ranged from mild steel to ultra-high strength one having 980 MPa in tensile strength, and the joinability for three steel and aluminium alloy sheets for various combinations was examined from both experiments and finite element simulation. The joinability was improved by setting a softer sheet uppermost due to smooth piercing. In addition, the joining range for self-piece riveting of three high strength steel and aluminium alloy sheets was extended by optimising a shape of the die, and the ultra-high strength steel, mild steel and aluminium alloy sheets were successfully joined.     

Theoretical and experimental plastic strain ratios in planar isotropic textures

The plastic strain ratios of planar isotropic sheet specimens were studied by using unidirectionally solidified commercial Al. Sn and Al-Cu alloy sheets and Cu sheets electrodeposited under the various electrolysis conditions. The measured plastic strain ratios of [100] planar isotropic sheets by using unidirectionally solidified Al and Al-Cu alloy are about 0.17–0.52, that of [110] planar isotropic sheets using unidirectionally solidified Sn(BCT) are about 2.5, that of [110] planar isotropic sheets using electrodeposited Cu are 1.38–2.05 and that of [111] planar isotropic sheets using electrodeposited Cu are 2.61–2.85. There is a substantial discrepancy between the experimental plastic strain ratios which are measured from planar isotropic sheets and theoretical plastic strain ratios which are calculated by Backofen method and Bunge method, but the measured plastic strain ratio of [100] planar isotropic sheet using unidirectionally solidified Al and Al-Cu alloy is in good agreement with Bunge method and the measured plastic strain ratio of [110] and [111] planar isotropic sheets using electrodeposited Cu are in good agreement with Backofen method.