LPBF IN718の断裂強度に対する微細構造と結晶学的質感の影響
関連する実験動画
Updated: Sep 10, 2025

08:36
Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
Published on: November 30, 2017
9.6K
José David Perez-Ruiz1,2,3, Wilmer Velilla-Díaz4, Mikel Abasolo2,3
1School of Mechanical Engineering, Universidad Industrial de Santander, Bucaramanga 680002, Colombia.
Materials (Basel, Switzerland)
|August 28, 2025
まとめ
添加物で製造されたIN718の断裂強さはアニゾトロプです. コンポーネントを45°の方向に配置すると,微細構造が変化し,プラスチックの収納性が向上するので,断裂の頑丈性が著しく改善されます.
科学分野:
- 材料科学
- 機械工学
- アディティブ製造
背景:
- 断裂強度アニソトロピーは,レーザー粉末床融合 (LPBF) IN718のコンポーネントで重要な問題です.
- このアニソトロピーは,材料の結晶構造とラメラー微細構造から生じる.
研究 の 目的:
- LPBF IN718の断裂強度に対する粒子の向きの影響を調査する.
- 同じレーザースキャン戦略を使用して,垂直と45°傾斜の構築方向間の断裂強さを比較します.
主な方法:
- コンパクトテンション (CT) 試験はASTM E399およびASTM E1820規格に従って実施された.
- 微細構造の分析は,電子反射 difrraction (EBSD) とスキャニング電子顕微鏡 (SEM) を用いて行われました.
主要な成果:
- 傾き45°の標本 (R0−45) は,垂直標本 (R0−0) よりも約2.5倍高い断裂強度を示した.
- R0-45の指向は,より小さな実粒度,より高い幾何学的に必要な変位 (GND),およびカーネルの平均誤方向 (KAM) を示した.
結論:
- R0-45の折りたたみ強さの強化は,プラスチックの収納と割れ目のシールドメカニズムの改善に起因する.
- LPBF IN718の微細構造とアニゾトロプ的骨折の関係が確認され,コンポーネントの設計と指向を助長した.
関連する概念動画
Stress-Strain Diagram - Brittle Materials
2.8K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.8K
Microcracking in Concrete
205
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...
205
Yield Criteria for Ductile Materials under Plane Stress
213
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...
213
Mechanical Characteristics of Steel
757
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
757
Behavior of Concrete Under Compressive Load
268
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
268
Toughness and Hardness of Aggregate
334
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
334

