Abstract Inter-pass deformation is an effective method for refining the coarse β-grain structure normally produced in high-deposition-rate additive manufacturing processes, like wire-arc additive manufacturing. The effectiveness of applying contoured surface rolling deformation tracks to each added layer has been studied by developing, and applying, a large-area SEM-based strain mapping technique. This technique is based on calibration of the average point-to-point Local Average Misorientation (LAM) of α-phase lamellar variants in EBSD orientation data to the local effective plastic strain. Although limited in the strain range that can be measured, the technique has proven to be very effective for identifying the size and depth of the plastic zone induced by surface rolling, as well as the local strain distribution, up to a saturation limit of ~12%. The strain fields mapped showed a close correlation to the region and level of recrystallization that occurred in the deformation zones during rapid re-heating through the β transus. The β recrystallization identified was consistent with the local strain distribution within the plastic zones measured by the LAM method and previous work on the recrystallization mechanisms operating in WAAM inter-pass deformation processes.

中文翻译：

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通过 EBSD 错误取向分析量化 Ti-6Al-4 V 层间轧制线弧 AM 中的应变场和晶粒细化

摘要 道间变形是细化通常在高沉积速率增材制造工艺（如线弧增材制造）中产生的粗β晶粒结构的有效方法。通过开发和应用基于大面积 SEM 的应变映射技术，研究了将轮廓表面滚动变形轨迹应用于每个附加层的有效性。该技术基于 EBSD 取向数据中 α 相层状变体的平均点对点局部平均取向误差 (LAM) 与局部有效塑性应变的校准。尽管可测量的应变范围有限，但该技术已被证明对于识别由表面滚动引起的塑性区的大小和深度以及局部应变分布非常有效，高达约 12% 的饱和极限。绘制的应变场显示出与通过 β 转变快速再加热期间变形区中发生的再结晶区域和水平密切相关。确定的 β 再结晶与通过 LAM 方法测量的塑性区内的局部应变分布以及先前在 WAAM 层间变形过程中操作的再结晶机制的工作一致。