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电缆弧的微结构演变和机械性能 增材制造 DSS2209 双不钢
Jian Sun1, Liang Liu2, Long Zhang1,2,3
1Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes, Tongling University, Tongling 244061, China.
Materials (Basel, Switzerland)
|September 13, 2025
概括
双重不钢的冷金属转移线弧增材制造 (CMT-WAAM) 显示了各种微观结构和异构的机械性能. 工艺热史显著影响相位分布和机械性能,对于优化大规模组件制造至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 增材制造 增材制造 增材制造
- 金工业是金工业的一个方面.
背景情况:
- 双重不钢 (DSS) 提供了强度和耐腐蚀性的结合.
- 电弧增材制造 (WAAM) 能够制造大型金属元件.
- 了解微结构进化是控制增材制造材料属性的关键.
研究的目的:
- 研究通过CMT-WAAM制造的DSS2209中的微结构演变.
- 分析热史对相位分布和机械性能的影响.
- 将过程参数与微观结构特征和性能进行相关联以进行优化.
主要方法:
- 用于DSS2209薄壁组件的冷金属转移线弧增材制造 (CMT-WAAM).
- 光学显微镜,扫描电子显微镜与能量分散光谱 (SEM-EDS) 和电子反射散射衍射 (EBSD) 用于微观结构分析.
- 拉力测试和硬度测量,以评估机械性能.
主要成果:
- 由于热梯度,在建筑高度上观察到显著的微观结构异质性.
- 确定了明显的相位分布:延长的奥氏体与Widmanstätten奥氏体 (WA) 在底部,中等轴的奥氏体与减少的WA和谷物边界奥氏体 (GBA) 在中间,和粗的奥氏体在顶部.
- 不同类型的机械性质:在水平样本中强度更高,在垂直样本中柔性更大.
- 在重新化的区域中,二次奥氏体 (γ2) 形成与Cr耗尽影响了抗性.
- 统一的硬度范围为225-239HV.
结论:
- DSS2209的CMT-WAAM导致微结构变化,受冷却速率和层间热循环的影响.
- 工艺诱导的热梯度直接影响奥氏体形态,颗粒大小和相分布.
- 机械性质的异质性与微观结构的对齐和统一性有关.
- 结果为优化大型DSS组件的WAAM提供了洞察力,例如船舶螺旋.
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