相关实验视频
Updated: Jun 17, 2025

07:18
Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
Published on: August 13, 2019
6.9K
在受热影响区域,对FeMnAl合金进行液化裂纹评估
Rafael Giorjao1, Kaue C Riffel1, Eric Brizes2
1Welding Engineering, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, USA.
Science and technology of advanced materials
|August 6, 2024
概括
铁-- (FeMnAl) 钢中的高 (Mn) 和碳 (C),低 (Al) 含量增加了液化裂变的易感性. 较低的Mn和C,较高的Al,通过促进更耐用的微观结构来提高接性.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 机械工程 机械工程
背景情况:
- 铁-- (FeMnAl) 钢具有低密度和高机械性能,使其适用于装甲车的应用.
- 尽管对机械性能和热处理进行了广泛的研究,但FeMnAl钢的接性需要进一步研究,以便在工业上实施.
研究的目的:
- 为了研究造FeMnAl合金的液化裂变易感性.
- 确定关键合金元素 (C,Mn,Al) 对FeMnAl钢的接能力的影响.
主要方法:
- 使用点-Varestraint技术来评估液化裂纹.
- 采用光学和电子显微镜进行微观结构分析.
- 应用CALPHAD (阶段图计算) 来分析组合依赖的裂变行为.
主要成果:
- 含有较高Mn和C,较低Al含量的FeMnAl钢构成品对液化裂变的敏感性最高.
- 相反,含量较低的Mn和C,含量较高的Al的化合物表现出更高的抗裂性.
- 较低的含量促进了全 (γ) 微结构,与铁 (α) 或双 (α + γ) 微结构相比,更容易发生受热影响区域 (HAZ) 破裂.
结论:
- 合金成分显著影响FeMnAl钢的液化裂变易感性.
- 优化Mn,C和Al含量对于提高这些先进钢的接性至关重要.
- 微观结构,特别是完全γ矩阵的存在,在受热影响区 (HAZ) 裂变易感性中起着关键作用.
更多相关视频
相关概念视频
Microcracking in Concrete
114
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...
114
Fatigue
178
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...
178
Yield Criteria for Ductile Materials under Plane Stress
158
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
158
Residual Stresses
208
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...
208
Stress Concentrations
276
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
276
Stress-Strain Diagram - Ductile Materials
666
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...
666

