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首页> 外文会议>ASM International Conference >Advanced Techniques for In-Situ Monitoring of Phase Transformations During Welding Using Synchrotron-Based X-Ray Diffraction
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Advanced Techniques for In-Situ Monitoring of Phase Transformations During Welding Using Synchrotron-Based X-Ray Diffraction

机译：使用Synchrotron的X射线衍射在焊接过程中出于原位监测的先进技术

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摘要

Understanding the evolution of microstructure in welds is an important goal of welding research because of the strong correlation between weld microstructure and weld properties. To achieve this goal it is important to develop a quantitative measure of phase transformations encountered during welding in order to ultimately develop methods for predicting weld microstructures from the characteristics of the welding process. To aid in this effort, synchrotron radiation methods have been developed at Lawrence Livermore National Laboratory (LLNL) for direct observation of microstructure evolution during welding. Using intense, highly collimated synchrotron radiation, the atomic structure of the weld heat affected and fusion zones can be probed in real time. Two synchrotron-based techniques, known as spatially resolved (SRXRD) and time resolved (TRXRD) x-ray diffraction, have been developed for these investigations. These techniques have been used to investigate welding induced phase transformations in titanium alloys, low alloy steels, and stainless steel alloys. This paper will provide a brief overview of these methods and will discuss microstructural evolution during the welding of low carbon (AISI 1005) and medium carbon (AISI 1045) steels where the different levels of carbon influence the evolution of microstructures during welding.
机译：理解焊缝中微观结构的演变是焊接研究的重要目标，因为焊接微观结构和焊接性能强相相关。为了实现这一目标，重要的是在焊接期间开发遇到的相变的定量测量值，以便最终开发从焊接过程的特性预测焊接微观结构的方法。为了帮助这项努力，在劳伦斯利弗莫尔国家实验室（LLNL）开发了同步辐射方法，用于直接观察焊接过程中的微观结构演变。使用强烈的高度准直的同步辐射，可以实时探测焊接热影响和熔融区的原子结构。已经开发出用于这些研究的两个基于同步rotron的技术，称为空间分辨（SRXRD）和时间分辨（TRXRD）X射线衍射。这些技术已经用于研究钛合金，低合金钢和不锈钢合金中的焊接诱导的相变。本文将简要概述这些方法，并将讨论在低碳（AISI 1005）和中碳（AISI 1045）钢的焊接过程中的微观结构演变，其中不同水平的碳在焊接过程中的微观结构的演变。

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