不同制坯工艺对不锈钢复合板坯料轧制的影响研究

不锈钢复合板生产可以采用坯料非对称真空复合、爆炸复合和对称焊接复合等工艺制坯。针对以上三种制坯方式以及相应不锈钢复合板坯料轧制工艺展开研究、对比分析,确定不同组坯方式对复合板轧制的影响,从而设计出合理的制坯工艺。     

铝合金复合板轧制过程的数值模拟

运用DEFORM-3D软件,模拟了在440℃下,轧制变形量为10%的铝合金复合板材的轧制过程,分析了轧制后复合板坯料界面结合情况以及温度场和应力场分布的规律。结果表明:在给定的模拟条件下板坯发生了很好的复合反应;随着轧制的进行,坯料的等效应力逐渐增大,但当轧件进入咬入阶段后其等效应力迅速增加,轧制结束后板坯存在很大的残余应力,应进行去应力退火处理;在轧制过程中坯料散热较快且均匀,在进入咬入阶段时温度会因塑性变形产生升温效应,但不明显。     

不锈钢─碳钢大厚复合板坯的爆炸焊接和轧制

介绍了不锈钢─碳钢大厚复合板坯的爆炸焊接和热、冷轧工艺，及其在不同状态下的成分、组织和性能。探讨了爆炸焊接和爆炸复合材料轧制的机理。叙述了这种复合材料的用途。     

不锈钢——碳钢大厚复合板坯的爆炸焊接和轧制

介绍了不锈钢－碳钢大厚复合板坯的爆炸焊接和热，冷轧工艺，及其在不同状态下的成分，组织和性能，探讨了爆炸焊接和爆炸复合材料轧制的机理，叙述了这种复合材料的用途。     

苏联《有色金属》、3年、No.3,加工部分题录

加大铜带卷的焊接先进工艺 在连续挤压初始咬入中圆坯料与工具的接触的变形规律性 熔炼铝合金时温度差的分析 由铜中氢和氧的含量决定的盘条质量 撞拔光亮铜盘条的工艺性 (?)弹性合金的应力腐蚀开裂 熔炼黄铜炉渣的成分和结构     

对称碰撞爆炸焊接实验及其实际应用

介绍了对称碰撞爆炸焊接的实验方法，总结了它的实际应用。指出，这种爆炸焊接的工艺和技术，不仅在研究爆炸复合材料内部的物理和化学现象中有重要的理论价值，而且在生产大厚复合板坯方面更有优势。     

特厚钢板轧制用坯料制造方法及生产实践

全面综述了国内外特厚板用坯料的制造方法,如传统模铸法,电渣重熔法、焊接复合法、厚板坯连铸法、厚板坯锻压法、单向凝固法及顺序凝固法。分析了各种生产方法的优缺点,总结了这些技术在特厚板生产中的应用情况。     

用“爆炸焊接”焊接铜铝过渡板

爆炸焊接在我国还是一种新的焊接方法,它可以将两种大面积的金属板焊接成双金属板。我厂大电流石墨化炉导电母线和铜铝母线接头,原先采用螺栓直接压接,经过几年运行接触面电腐蚀严重。我们采用爆炸焊接新工艺,爆炸成300×300×20mm铜板与300×300×3mm铝板的双金属过渡板。现在已用于石墨化炉,解决了铜铝直接压接电腐蚀严重的问题。铜铝过渡接头的接触电阻为铜铝直接压接电阻的四分之一;稳定性好,经一年的运行,接触     

金属爆炸加工

本文介绍金属爆炸加工国内外现状,其中包括爆炸加工能源,爆炸焊接、爆炸强化、硬化、爆炸法消除金属焊接残余应力及爆炸成形等。     

我国极厚钢板生产制造技术的发展

详细介绍了极厚板用坯料的技术进步,包括电渣重熔扁钢锭、焊接复合连铸坯、大厚度连铸板坯、单向凝固钢锭等极厚钢板轧制用高质量坯料,分析了其生产工艺及技术特点,总结了极厚板用原料的冶金技术,论述了极厚板轧制技术的发展、热处理设施与技术,建议进一步优化产品工艺、提升实物质量、开发高品质极厚钢板。     

钛/铝复合板爆炸焊接技术研究进展

通过爆炸焊接技术制备的钛/铝复合板可兼具钛合金耐腐蚀性和铝合金低成本的优点。对钛/铝复合板爆炸焊接技术的研究进展进行介绍,论述了炸药种类、质量比R、基覆板间距及爆炸焊接窗口等主要工艺参数对钛/铝复合板组织和性能的影响;分析了影响钛/铝复合板结合界面的主要因素——金属间化合物种类、扩散层和界面波形;对钛/铝复合板硬度、抗剪切强度、抗拉强度及拉伸断口的研究进行了汇总分析。最后,指出了钛/铝复合板爆炸焊接工艺研究的重点发展方向。     

相控阵技术在爆炸焊接钛/钢复合板检测中的应用

国内某化工项目使用爆炸焊接钛/钢复合板,除了对结合性能有高于标准要求的指标外,对界面结合的均匀性也提出要求.目前,对界面结合均匀性的判定采用常规的超声脉冲回波法难以实现,采用常规超声C扫检测速度较慢,无法满足大批量的生产进度要求.国内首次将相控阵技术应用到爆炸焊接层状金属复合板产品检测和验收中.相控阵检测通过电子扫查技...     

Interfacial Reaction during Friction Stir Welding of Al and Cu

Commercially pure copper was joined to a 1050 aluminum alloy by friction stir welding. A specific configuration where the tool pin was fully located in the aluminum plate was chosen. In such a situation, there is no mechanical mixing between the two materials, but frictional heating gives rise to a significant thermally activated interdiffusion at the copper/aluminum interface. This gives rise to the formation of defect-free joints where the bonding is achieved by a very thin intermetallic layer at the Cu/Al interface. Nanoscaled grains within this bonding layer were characterized using transmission electron microscopy (TEM). Two phases were identified, namely, Al₂Cu and Al₄Cu₉ phases. The nucleation and growth of these two phases are discussed and compared to the standard reactive interdiffusion reactions between Cu and Al.     

Friction welding of Cu-tube to Al-tube plate using an external tool

In the present study, friction welding of tube to tube plate using an external tool (FWTPET) was used to weld copper tubes with aluminum plates. Tubes were prepared with holes along the faying surfaces of tubes and cleaned before welding. The weld microstructure shows line of stir zone (SZ), a narrow thermo mechanically affected zone and heat affected zone (HAZ). The welded samples were found to have satisfactory joint strength and the XRD study showed the presence of AlCu intermetallic in the weld zone. The hardness survey revealed that there was a slight increase in hardness adjacent to the weld interface due to grain refinement. Better weld joints were achieved when the tool rotation speed and interference are 1500 rpm and 0.8 mm respectively. The present study confirms that a high quality copper tube to aluminium tube plate joint can be achieved by FWPET process.     

Fabrication of Aluminum Foam/Dense Steel Composite by Friction Stir Welding

Aluminum foam/dense steel composites were fabricated by friction stir welding (FSW). It is expected that both mixing a blowing agent into aluminum and bonding the aluminum precursor to steel can be conducted simultaneously by FSW. It was shown that although heat treatment of the precursor evolved a brittle intermetallic compound layer, the bonding strength of the interface consisting of the intermetallic compound layer was relatively high compared with the fracture strength of the aluminum foam itself.     

高界面结合强度铜/钼/铜叠层复合材料的制备研究

采用非平衡态的高能铜离子注入技术,对钼芯材表面进行改性并一次覆铜形成过渡铜层,将原本不固溶的的钼/铜界面转化为铜/铜界面,制得高界面结合强度的铜/钼/铜叠层复合材料;采用近终形的热等静压复合技术进行二次覆铜,结合小变形量冷轧工艺进行复合板材精整,降低各层协同变形量,保证了叠层复合材料的板形、芯层质量、表面粗糙度及平行度。本方法所制备的铜/钼/铜叠层复合材料具有界面结合强度高、板形良好、芯层质量好且平行度好的优点,可作为一种电子封装材料或热沉材料应用于电子、信息技术领域。     

超细晶Cu/AI异种材料搅拌摩擦焊组织与性能研究

超细晶材料综合性能优异,但组织热稳定性较差,焊接后接头组织容易发生异常长大,使其性能急剧下降。因此,合适的连接工艺对大尺寸超细晶结构件的应用具有重要工程意义。以超细晶铜、粗晶铝以及粗晶铜、粗晶铝作为结构母材,采用热输入量小的搅拌摩擦焊（FSW）工艺进行连接探索,系统观察了铜铝接头组织与性能。结果表明,超细晶铜与铝接头界面处元素互扩散能力较强,形成较多的Al4Cu9 金属间化合物;在焊接过程中,当搅拌头转速为1000 r/min,焊接速度为50 mm/min时,粗晶铜与铝接头硬度可达HV 211,超细晶铜与铝焊接接头可获得良好的力学性能。     

Influence of Tool Offsetting on the Structure and Morphology of Dissimilar Aluminum to Copper Friction-Stir Welds

In this work, a systematic analysis of the effect of tool offsetting on the morphological, structural, and mechanical properties of 6082-T6 aluminum to copper-DHP friction-stir welds was performed, enabling full understanding of Al-Cu bonding structure and failure mechanisms. Important relations between tool positioning and the thermomechanical phenomena taking place during welding were established. Tool offsetting was revealed to be an effective way of solving one of the most important concerns in Al/Cu friction-stir welding, i.e., the formation of large amounts of intermetallic-rich structures, which deeply influence the final strength and surface morphology of the welds. Actually, for welds produced without tool offsetting, it was found that the formation of fluidized intermetallic-rich structures promote the formation of internal decohesion areas inside the nugget, which have a detrimental effect on weld strength. For welds carried out with tool offsetting, intermetallic formation is almost suppressed, but important metallurgical discontinuities in the vicinity of large copper fragments, dispersed over the nugget, and at the nugget/copper interface were also found to have a detrimental effect on weld strength.     

CrNiMo-CrNi3Mo-CrNiMo三层复合超高强度钢板开发

为了开发同时具有超高强度和良好韧性的低合金超高强度钢板,采用30MnCrNiMo连铸坯和33MnCrNi3Mo钢锭,经过真空复合焊接,高温轧制,淬火+低温回火热处理工艺研制出15 mm CrNiMo-CrNi3MoCrNiMo三层复合超高强度钢板;利用探伤、拉伸、冷弯、冲击、硬度等试验检验其结合度和力学性能;利用光学显微镜、扫描电镜等分析三层复合超高强度钢的组织和冲击断口形貌。结果表明,采用该工艺生产的三层复合超高强度钢板结合性良好,能够满足GB/T 7734-2015 Ⅰ级探伤要求;复合钢板的综合力学性能良好,结合面处硬度值存在明显的过渡区域;结合面组织和基体组织均为回火马氏体组织     

铜包铝丝材的旋锻复合-拉拔成形与组织性能

采用"热旋锻-拉拔"方法制备了直径为φ65 μm、包覆铜层厚度较均匀、表面质量高和界面结合质量良好的铜包铝复合微丝,研究了合理热旋制度、热旋复合成形铜包铝线材的组织和界面结合状态以及中间退火和拉拔对线材组织与性能的影响.结果表明:合理的旋锻制度为旋锻温度350℃,单道次变形量40%,旋锻后形成了动态再结晶组织和厚度为0.7 μm的界面扩散层.复合线材的合理退火工艺参数为350℃/30 min (退火温度350℃、退火时间30 min),该条件下退火后线材延伸率达到最高值35.7%,界面扩散层厚度约为2.1 μm,退火后铜层和铝芯发生再结晶,组织内部形成等轴晶组织.当退火温度超过350℃时,铜层和铝芯晶粒长大,界面扩散层厚度增加,从而导致线材的延伸率下降.将单道次变形量控制在15%~20%,经过粗拉,制备了φ0.96 mm的丝材;粗拉后不进行退火处理,将单道次变形量控制在8%~15%,经过细拉,制备了表面光洁、直径为φ65 μm的复合微丝.在拉拔过程中,铜层和铝芯均出现〈111〉丝织构.