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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Stress-Strain Diagram - Ductile Materials01:24

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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...
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Residual Stresses01:26

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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...
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Mechanical Characteristics of Steel01:18

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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.
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Deformation of Member under Multiple Loadings01:11

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Related Experiment Video

Updated: Apr 15, 2026

Micromechanical Tension Testing of Additively Manufactured 17-4 PH Stainless Steel Specimens
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Research on the Microstructure and Performance Regulation of SLM 304 Steel Under Intermittent Deformation.

Huimin Tao1, Linlin Ma2, Bin Liao1

  • 1Key Laboratory of Key Technologies for Mechanical Industry Hydroelectric Power Generation Pump Turbine, Zhejiang Key Laboratory of Pumps and Turbines, Zhejiang Engineering Research Center of Advanced Water Conservancy Equipment, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China.

Materials (Basel, Switzerland)
|April 14, 2026
PubMed
Summary

Intermittent stretching deformation significantly alters selective laser melting (SLM) 304 steel

Keywords:
corrosion performanceintermittent deformationmechanical performancemicrostructureselective laser meltingstainless steel

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Mechanical Engineering

Background:

  • Selective Laser Melting (SLM) is a key additive manufacturing technique for 304 stainless steel.
  • Understanding the effects of post-processing deformation on SLM materials is crucial for performance optimization.
  • Intermittent stretching deformation is explored as a method to tailor material properties.

Purpose of the Study:

  • To investigate how varying intermittent stretching deformation step sizes influence the microstructure, mechanical properties, and corrosion resistance of SLM 304 steel.
  • To elucidate the mechanisms behind these property changes.
  • To provide a basis for designing high-performance SLM 304 steel components.

Main Methods:

  • Selective laser melting (SLM) was used to produce 304 steel samples.
  • Samples were subjected to different intermittent stretching deformation step sizes.
  • Microstructural analysis, mechanical testing (tensile, nano-hardness), and corrosion resistance evaluation (pitting resistance) were performed.

Main Results:

  • Larger deformation step sizes led to more intact microstructures and lower martensite content.
  • Smaller step sizes resulted in distorted microstructures and increased martensite.
  • Tensile strength, nano-hardness, and elastic modulus decreased with increasing step size, while elongation increased.
  • Corrosion resistance improved with larger step sizes, with original specimens showing the best performance and continuously stretched specimens the worst.

Conclusions:

  • Intermittent deformation step size is a critical parameter influencing SLM 304 steel's microstructure and properties.
  • Optimizing deformation parameters can enhance mechanical performance and corrosion resistance.
  • This research offers theoretical support for the application of SLM technology in demanding engineering applications.