The fatigue crack growth (FCG) rates and crack-tip plastic zone size data for wire + arc additive manufacturing (WAAM)-processed 5087 alloys before and after in situ hot-rolling treatment were investigated and compared. After hot-rolling, the WAAM-processed alloys possessed higher strength. During the FCG tests, the crack-tip field was monitored using a digital image correlation (DIC) technique. The improved FCG resistance and smaller plastic zone area of the WAAM-processed alloys after hot-rolling were responsible for the grain refinement. Therefore, in situ hot-rolling treatment is a promising technique for optimising the properties of WAAM-processed alloys.

对线材+电弧增材制造 (WAAM) 处理的 5087 合金在原位热轧处理前后的疲劳裂纹扩展 (FCG) 速率和裂纹尖端塑性区尺寸数据进行了研究和比较。热轧后，WAAM处理的合金具有更高的强度。在 FCG 测试期间，使用数字图像相关 (DIC) 技术监测裂纹尖端场。热轧后 WAAM 加工合金的抗 FCG 性能提高和塑性区面积变小是晶粒细化的原因。因此，原位热轧处理是优化 WAAM 加工合金性能的一种很有前景的技术。