铜合金和钢的热等静压扩散焊

本文研究了铜合金QSn6.5-0.1与钢40CrNiMoA的热等静压扩散焊接,对工艺参数和夹层材料进行了选择对比。其平均接头强度δb为401.3MPa,加镍夹层后视添加工艺的不同其平均接头强度σb为451～616.8MPa。接头强度满足设计指标(σb≥350MPa),并远远超出QSn6.5-0.1铜合金退火状态σb≥294MPa之值,该工艺已应用于型号伺服机构中。

精铸钛合金后封头致密化处理

本文研究了用装备石墨加热炉的热等静压机进行精铸ＺＴ－４钛合金后封头致密化处理。采用铁屑保护有效地防止了石墨加热炉的污染。热等静压处理的ＺＴ－４铁合金后封头内部缺陷全部消除，合金的强度基本不变，塑性有明显的提高。产品的可靠性极高。

异材热等静压扩散焊接

本文研究了异材热等静压扩散焊接,给出了铜合金和钢、硬质合金和钢、铌合金C103和GH40高温合金的焊接强度。试验结果表明:热等静压扩散焊接的接头强度高、性能一致性好。

高性能钛合金粉末冶金技术研究

采用热等静压预合金粉工艺对Ti - 6Al - 4V钛合金粉末冶金技术进行了研究 ,同时就原料粉状态对粉末钛合金性能的影响进行了初步研究 ,并进行了近净形成型工艺试验。结果表明 ,采用预合金粉工艺制备的Ti- 6Al - 4V粉末钛合金材料性能良好 ,且可实现近净形成型 ;这说明预合金粉工艺在制备高性能。

Properties and forming process of prealloyed powder metallurgy Ti-6Al-4V alloy

The properties and forming process of prealloyed powder metallurgy(PM) Ti-6Al-4V alloy were researched for application of high performance of titanium parts. Hot isostatic press(HIP) technology and two kinds of powders were used in the prealloyed processing to get full density material. Tensile properties,impact toughness and fracture toughness of PM Ti-6Al-4V alloy were studied and discussed. The microstructures were examined with optical microscope and the morphologies of powders were observed by SEM. Forming processes were performed to fabricate PM titanium parts. The experiment results show that the prealloyed PM Ti-6Al-4V alloy has same good properties as wrought material and the complex shape PM parts can be near-net-shaped. Some of the parts have been commercially used. This indicates that the prealloyed process should have bright prospects in making high-performance,complex shape and low-cost titanium alloy parts.