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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

740
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...
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Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

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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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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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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Residual Stresses01:26

Residual Stresses

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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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Hooke's Law01:26

Hooke's Law

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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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Updated: Aug 23, 2025

Micromechanical Tension Testing of Additively Manufactured 17-4 PH Stainless Steel Specimens
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Enhanced Spring Steel's Strength Using Strain Assisted Tempering.

Zbyšek Nový1, Pavel Salvetr1, Jakub Kotous1

  • 1COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic.

Materials (Basel, Switzerland)
|October 27, 2022
PubMed
Summary

Strain assisted tempering (SAT) significantly enhances spring steel properties, improving strength and toughness for lighter, more efficient vehicles. This advanced process optimizes microstructure for superior mechanical performance.

Keywords:
dilatometrymechanical propertiesmedium carbon steelmicrostructurestraintempering

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Enhancing mechanical properties of spring steels can reduce vehicle mass, leading to decreased fuel or electric energy consumption.
  • Conventional quenching and tempering (QT) is a standard heat treatment process for steels.
  • Microstructure and mechanical properties can be significantly altered by incorporating strain during tempering.

Purpose of the Study:

  • To investigate the effects of strain assisted tempering (SAT) on the microstructure and mechanical properties of spring steels.
  • To compare the SAT process with conventional quenching and tempering (QT).

Main Methods:

  • Application of strain assisted tempering (SAT) technology, involving alternating quenching, tempering, and strain operations.
  • Controlled deformation using rotary swaging with 17% strain at a rate of approximately 120 s⁻¹ after the first tempering.
  • Metallographic analysis and X-ray diffraction measurement to characterize microstructural differences.

Main Results:

  • SAT processing resulted in considerably higher strength parameters compared to conventional QT.
  • Enhanced notch toughness was observed with SAT, alongside decreased elongation and reduction of area.
  • Microstructural analysis revealed carbideless islands with nanotwins in martensitic laths after SAT, unlike the tempered martensite with transition carbides seen after QT.

Conclusions:

  • Strain assisted tempering is an effective technology for significantly enhancing the mechanical properties of spring steels.
  • The unique carbideless, nanotwinned microstructure achieved through SAT contributes to improved strength and toughness.
  • Optimizing the SAT process allows for achieving acceptable ductility parameters, making it a promising alternative to conventional heat treatments for automotive applications.