增材制造的Corax maraging不钢的断裂行为
Xiaojie Zhao1, Yang Gao1,2, Kai Zhao1
1PetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, China.
Heliyon
|July 23, 2024
概括
这项研究研究了在增材制造的Corrax不钢中裂纹的传播. 裂显示出显著的塑性变形,并受到材料微观结构的影响,而不仅仅是粒度边界.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 金工业是金工业的一个方面.
背景情况:
- 添加制造 (AM) 不钢,如Corax (Fe-Cr-Ni-Al),提供超高强度.
- 这些先进材料中精确的断裂机制仍然不完全理解.
- 了解裂传播对于预测AM组件的性能和可靠性至关重要.
研究的目的:
- 为了阐明增材制造的Corrax不钢中的裂传播机制.
- 为了将裂行为与微观结构特征和塑性变形相关联.
- 识别影响裂开始和生长的因素.
主要方法:
- 对Corrax不钢进行拉伸测试,以检测其是否破裂.
- 扫描电子显微镜 (SEM) 用于裂表面分析.
- 电子反射散射衍射 (EBSD) 用于微观结构的表征.
- 核心平均误导 (KAM) 分析以量化塑性变形.
主要成果:
- 在拉力轴的45-60°角度传播的裂.
- 观察到跨颗粒裂纹的传播,高角粒边界的影响最小.
- 在泰勒系数较低的地区,裂传播受到阻碍.
- 显著的塑料变形伴随着裂传播过程,这是KAM分析所证明的.
- 还检查了和孔在裂传播中的作用.
结论:
- 在AM Corrax钢中裂纹的传播是一个复杂的过程,涉及显著的塑料变形.
- 微观结构特征,如局部晶体定向 (泰勒因子),在抑制裂生长方面发挥作用.
- 颗粒边界特征似乎不像预期的那样对这种材料的裂偏移来说不那么重要.
- 需要对毛孔和颗粒等缺陷的影响进行进一步的调查.
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