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首页> 外文会议>Conference on Laser Materials Processing Vol.85e: Rapid Prototyping and Microfabrication, Nov 16-19, 1998, Orlando, FL USA >Fabrication of Graded-Boundary Ni/Steel Material by Laser Beam and Electron Beam
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Fabrication of Graded-Boundary Ni/Steel Material by Laser Beam and Electron Beam

机译：激光束和电子束制备梯度边界Ni /钢材料

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摘要

For the development of thick metal/metal graded-boundary materials, the fabrication of Ni/Steel graded-boundary material was carried out by high energy density beam. In order to produce compositionally graded boundary layer between substrate steel and added Ni metal, multiple surface alloying treatments were performed with both CO_2 laser beam and electron beam. Ni sheet metal was placed on low carbon steel, and a laser beam was irradiated on that surface to produce a homogeneous alloyed layer. On this first surface alloyed layer another Ni sheet was placed and a laser beam was irradiated again to produce the second surface alloyed layer. Sequential repetition of laser surface-alloying treatment for 5 tunes resulted in a compositionally graded region with the thickness of about 4mm from 65% Ni on surface to 0% in substrate. In this case root porosities were formed in lower part of graded layer due to characteristic property of laser processing and also solidification shrinkage cracks were formed in center of keyholes due to rapid cooling. Similar procedures were carried out by electron beam surface alloying treatment to produce graded-boundary layer. Sequential surface-alloying treatment for 4 times resulted in a compositionally graded region with the thickness of about 6mm from 80% Ni on surface to 0% in substrate. In this case root porosities were not formed in graded layer, but solidification shrinkage cracks were also formed due to rapid cooling.
机译：为了开发厚金属/金属梯度边界材料，通过高能量密度束进行Ni /钢梯度边界材料的制造。为了在基体钢和添加的Ni金属之间产生成分渐变的边界层，用CO_2激光束和电子束进行了多次表面合金化处理。将镍金属板放置在低碳钢上，并在该表面上照射激光束以产生均匀的合金层。在该第一表面合金层上放置另一个Ni片，并再次照射激光束以产生第二表面合金层。连续重复进行5次激光表面合金化处理会导致组成渐变区域，其厚度从表面的65％镍到基板的0％约为4mm。在这种情况下，由于激光加工的特性，在梯度层的下部形成了根部孔隙，并且由于快速冷却，在键孔的中心也形成了凝固收缩裂纹。通过电子束表面合金化处理进行类似的程序以产生梯度边界层。连续进行了4次表面合金化处理，形成了成分渐变的区域，从表面上的80％Ni到基底上的0％，厚度约为6mm。在这种情况下，在梯度层中没有形成根部孔隙，但是由于快速冷却也形成了凝固收缩裂纹。

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