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首页> 外文期刊>Welding International >Characterization for solidification and phase transformations of pure-titanium steel weld metal with time-resolved x-ray diffraction system
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Characterization for solidification and phase transformations of pure-titanium steel weld metal with time-resolved x-ray diffraction system

机译：时间分辨x射线衍射系统表征纯钛钢焊接金属的凝固和相变

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摘要

In situ observation of unidirectional solidification and phase transformation behavior of pure titanium during GTA welding was performed using reciprocal lattice space. The results obtained from this test are as follows. Dendrites progressed in the direction growth is easy; unidirectional solidification of GTA welds was performed and next, the direction with respect to a one dimensional x-ray beam was aligned well. Therefore, the diffraction pattern became a spot and while the same reflective surface passed through the solidification process, Bragg conditions were still met. By using a beam with extremely high parallelism (low wavelength dispersion) called an undulator beam, it has been proposed that the crystal growth direction during the solidification process can accurately be determined. The in-situ observation results of changing of composition shape during beta-alpha phase transformation using HLSCM shows that the beta transus is dependent on the cooling speed and based on an in-situ observation image, growth rate is estimated to be roughly 337 mu m/s Furthermore, plate shaped composition generated a nucleus from beta phase grain boundaries using surface undulation. These were the characteristics of diffusion transformation based on structure corresponding to atomic sites.
机译：使用互易的晶格空间原位观察了纯钛在GTA焊接过程中的单向凝固和相变行为。从该测试获得的结果如下。枝晶向生长方向发展很容易;对GTA焊缝进行单向凝固，然后，将一维X射线束的方向对准好。因此，衍射图样成为斑点，并且当相同的反射面通过固化过程时，仍然满足布拉格条件。已经提出通过使用具有极高的平行度（低波长色散）的光束（起伏器光束），可以精确地确定凝固过程中的晶体生长方向。使用HLSCM进行β-α相转变过程中组成形状变化的原位观察结果表明，βTransus取决于冷却速度，并且基于原位观察图像，估计生长速率约为337微米/ s此外，板状成分利用表面起伏从β相晶界生成核。这些是基于对应于原子位点的结构的扩散转变的特征。

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