2A12铝合金板形件振动时效试验

为了解决一种产品中的2Al2铝合金板形件切削加工变形问题,在有关振动时效设备制造厂家的大力支持下,采用不同的设备和工艺对其进行了振动时效和热处理时效的对比试验.试验结果表明,振动时效的效果比190℃×10 h热处理时效的效果好;振动时效的能源消耗也远比热处理时效的能源消耗低;这种铝合金板振动时效的难度比一般铸件、焊接件振动时效的难度大一些,应注意优选时效设备和工艺.     

水利水电工程灌浆施工技术与质量管理对策研究

水利水电工程是我国基础设施中的重要组成部分,也是落实水资源管理的核心工程,其质量将直接影响水资源调配的效率,也将影响区域的用水体验。本文以提升水利水电工程施工质量为目的,综合其中的灌浆施工技术展开细节讨论,明确了钻孔、灌浆、灌浆材料配置、质量监测等环节的细节,制定了全流程质量管控方案,确保能够为水利水电工程的综合质量提升奠定基础。     

解决7A04铝合金薄壁件加工变形的工艺试验

我厂生产的一种7A04超硬铝合金材料薄壁零件,最薄处只有1mm左右,在切削加工中很容易发生变形。 为解决其机加工变形问题,提高产品加工的合格率,我们取少量已进行粗车、尚未精车的零件,     

激光快速修复Ti-6A1-4V合金的显微组织与力学性能

针对Ti-6A1-4V合金在加工和服役过程中的损伤特点，对Ti-6A1-4V合金锻件的3种典型误加工缺陷——槽缺陷、面缺陷和体缺陷进行了激光快速修复研究。激光修复区与锻件基体形成致密冶金结合，Al、V合金元素由锻件基体到激光修复区均匀分布，无宏观偏析。激光修复区组织为粗大原始∥晶粒内分布细长的α针及编织细密的a＋β板条组织，呈现典型的魏氏结构，热影响区组织从锻件的等轴α＋转变β组织逐步过渡到魏氏（a＋β）组织。对预制有3种类型缺陷的激光修复试样进行室温静载拉伸试验和硬度测试，结果表明修复试样的拉伸性能达到锻件标准（HB5224-1982）。激光修复试样的硬度和强度高于锻件基体，而塑性则低于锻件基体。因此，激光修复区和锻件基体可看作是一种“强＋弱”的组合，这与二者的显微组织是相对应的。     

Microstructure and high temperature mechanical properties of laser rapidly formed Ti-6Al-4V alloy

Several tensile samples were prepared using laser rapid forming （LRF） with Ti-6Al-4V alloy as powder material, and the samples were annealed. The microstructure and high temperature mechanical properties of laser formed Ti-6Al-4V alloy through annealing treatment were investigated. The short-term and long-term tensile tests at 350 ℃ were performed. The results show that the microstructure of LRF samples consists of the large columnar prior β grains which grow epitaxially from the substrate along the deposition direction. There are Widmanstaitten a laths in prior β grains, but a laths in annealed microstructure are coarser, and their aspect ratio is lower than that in as-deposited microstructure. In addition, the prior β grain boundary is also coarsened and broken off through the annealing treatment. The high temperature mechanical properties of the annealed LRF samples exceed those of casting alloy significantly, especially the stress-rupture lifetime reaches 661.7 h even while the test stress increases from initial value of 490 MPa to the final stress of 800 MPa gradually.