Grain Size Control in the Weld Pool and Heat Affected Zone Using Holograms
Grain Size Control in the Weld Pool and Heat Affected Zone Using Holograms
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使用全息图控制焊池和热影响区的晶粒尺寸
DOI：
10.4028/www.scientific.net/msf.715-716.340
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Tyrer
中科院分区：
文献类型：
--
作者：
R. Higginson;M. Blackmur;M. Gibson;J. Tyrer
本文考虑使用全息光学元件（HOE）来成形焊缝，从而控制焊缝的晶粒尺寸和热影响区中的晶粒长大和相变。通过引入镍基填料粉末，使用HOE产生的不同能量密度，在碳钢上产生焊缝。根据焊缝轮廓、焊接熔池形状和存款和热影响区中的晶粒尺寸对焊缝的横截面进行了分析。电子背散射衍射（EBSD）结合能量色散X射线光谱（EDS）已被用来研究开发的微观结构。结果表明，通过利用HOE的焊接熔池内的晶粒尺寸可以被控制，使得当与用高斯光束看到的粗柱状晶粒相比时，开发出更等轴的晶粒结构。
This paper considers the use of Holographic Optical Elements (HOEs) to shape the weld beam and hence control the grain size of the weld bead and the grain growth and phase transformations in the HAZ. Welds have been produced on carbon steel with the introduction of a nickel based filler powder, using different energy densities produced by the HOEs. Cross sections of the welds have been analysed in terms of the weld profile, weld pool shape and grain size in the deposit and the HAZ. Electron BackScatter Diffraction (EBSD) coupled with Energy Dispersive X-ray Spectroscopy (EDS) has been used to study the microstructures developed. The results have shown that by utilising HOEs the grain size within the weld pool can be controlled such that a more equiaxed grain structure is developed when compared with the coarse columnar grains seen with a Gaussian beam.