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首页> 外文期刊>Science and Technology of Welding and Joining >In situ observations of ferrite - austenite transformations in duplex stainless steel weldments using synchrotron radiation
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In situ observations of ferrite - austenite transformations in duplex stainless steel weldments using synchrotron radiation

机译：用同步辐射原位观察双相不锈钢焊缝中铁素体-奥氏体转变。

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摘要

Ferrite (delta)-austenite (gamma) transformations in the heat affected zone (HAZ) of a gas tungsten arc weld in 2205 duplex stainless steel are observed in real rime using spatially resolved X-ray diffraction (SRXRD) with high intensity synchrotron radiation. A map showing the locations of the delta and gamma phases with respect to the calculated weld pool dimensions has been constructed from a series of SRXRD scans. Regions of liquid completely transformed gamma, a combination of partially transformed gamma with untransformed delta, and untransformed gamma + delta are identified Analysis of each SRXRD pattern provides a semiquantitative definition of both the delta/gamma phase balance and the extent of annealing, which are mapped for the first time with respect to the calculated weld pool size and shape. A combination of these analyses provides a unique real time description of the progression of phase transformations in the HAZ. Results show that during heating, delta and gamma both show signs of annealing as temperatures approach 550 deg C. The delta phase then starts to transform to gamma as temperatures approach 700 deg C. Although supported by thermodynamic calculations, this delta -> gamma transformation during heating has not been directly observed until now. Following this reaction, the HAZ microstructure evolves in three different ways. For peak temperatures less than approximately 1100 deg C, delta retransforms, reverting to its original base metal fraction on cooling When peak temperatures exceed approximately 1375 deg C, the microstructure completely transforms to delta before retransforming to a mixture of delta and gamma during weld cooling. For peak temperatures between 1100 and 1375 deg C, gamma is only partially transformed during both heating and cooling Using these real time observations, important kinetic information about the transformations occurring in duplex stainless steels during both non-isothermal heating and cooling of welding can be determined.
机译：使用具有高强度同步辐射的空间分辨X射线衍射（SRXRD），在真实边缘中观察到2205双相不锈钢中钨极气体保护电弧焊的热影响区（HAZ）中的铁素体-奥氏体（γ）转变。根据一系列SRXRD扫描，已构建了一个图表，该图表显示了相对于计算的熔池尺寸的δ相和γ相的位置。确定了液体完全转化的γ区域，部分转化的γ与未转化的δ的组合以及未转化的γ+δ的区域。对每个SRXRD模式的分析均提供了Δ/γ相平衡和退火程度的半定量定义，将其映射关于计算的焊池尺寸和形状的首次测量。这些分析的组合提供了HAZ中相变进程的唯一实时描述。结果表明，在加热过程中，随着温度接近550℃，δ和γ都显示出退火的迹象。随着温度接近700℃，δ相开始转变为γ。尽管在热力学计算的支持下，到目前为止，还没有直接观察到加热现象。反应之后，HAZ的微结构以三种不同的方式演变。对于低于约1100℃的峰值温度，δ会重新转变，冷却后会恢复为原始贱金属部分。当峰值温度超过约1375℃时，显微组织在焊缝冷却过程中会完全转变为δ，然后再转变为δ和γ的混合物。对于1100至1375摄氏度之间的峰值温度，在加热和冷却过程中，γ只会部分转化。使用这些实时观察，可以确定有关非等温加热和焊接冷却期间双相不锈钢中发生的转变的重要动力学信息。 。

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