形成控制和M2高速钢的磨损行为由直接能量沉积在曲的表面产生
Lan Jiang1, Xiaofang Pan1, Zhongkai Li1
1School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|January 8, 2025
概括
直接能量沉积 (DED) 优化了M2高速钢 (HSS) 的压切机. 交叉扫描和50%的重叠产生了优越的压力强度和耐磨性.
科学领域:
- 材料科学 材料科学 材料科学
- 制造业 工程 制造工程
- 表面工程是什么?表面工程是什么?
背景情况:
- 直接能量沉积 (DED) 是一种有前途的增材制造技术.
- 优化DED过程参数对于高性能应用,如滚筒切割机至关重要.
- 了解扫描策略和重叠比对材料特性的影响是必不可少的.
研究的目的:
- 研究扫描策略和重叠比对通过DED沉积的M2高速钢 (HSS) 的微观结构,微硬度,压力性能和耐磨性的影响.
- 为了确定最佳的DED参数,以生产具有增强性能的压切刀.
- 为切刀刀具的DED提供有价值的参考资料.
主要方法:
- M2 HSS 的 DED 在 316 L 的圆柱形表面上.
- 扫描策略的系统变化 (例如,交叉扫描) 和重叠比率.
- 微结构分析,微硬度测试,压力性能评估和耐磨性测试.
主要成果:
- 沿着沉积方向的粒度大小下降,硬度从187HV增加到708HV.
- 交叉扫描策略减少了多孔性缺陷,增强了压力强度.
- 通过交叉扫描和50%的重叠比率 (M-3样本) 实现了最佳的压力强度 (3904 MPa) 和耐磨性 (8 × 10-6 mm3·N-1·m-1).
- 磨损率最初下降,然后随着重叠率的上升而增加.
结论:
- 扫描策略和重叠比率显著影响DED处理的M2 HSS的微观结构和机械性能.
- 交叉扫描与50%的重叠比率提供一个统一,密集的微观结构,导致优越的压力强度和耐磨性.
- 这些发现为优化DED参数在制造高性能压切刀具方面提供了关键的见解.
更多相关视频
相关概念视频
01:24Stress-Strain Diagram - Ductile Materials
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
01:21Fatigue
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
01:26Residual Stresses
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
01:20Plastic Deformation in Circular Shafts
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
01:20Microcracking in Concrete
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
01:23Abrasion Resistance of Concrete
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...