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Steel Fastening Techniques01:17

Steel Fastening Techniques

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Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
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Structural steel products are created within a structural mill. The process begins with a beam blank that is reheated and then fed through a series of rollers. These rollers progressively shape the metal into its final form. Adjusting the spacings between the rollers allows for the production of different sections with the same nominal dimensions.
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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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Thin Modified Nitrided Layers of High-Speed Steels.

Khrystyna Berladir1,2, Tetiana Hovorun1, František Botko2

  • 1Department of Applied Materials Science and Technology of Constructional Materials, Faculty of Technical Systems and Energy Efficient Technologies, Sumy State University, 116, Kharkivska St., 40007 Sumy, Ukraine.

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Summary

Ion-plasma nitriding enhances high-speed steels like AISI M2 and AISI M41. Optimal parameters create high-nitrogen martensite, improving wear resistance and extending tool life.

Keywords:
AISI M2AISI M41high-speed steelindustrial growthion nitridingmicrohardnessprocess innovationwear resistance

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Metallurgy

Background:

  • High-speed steels (HSS) are crucial for cutting tools but require enhanced properties for demanding applications.
  • Improving the mechanical and tribological performance of HSS is essential for extending tool service life and reducing manufacturing costs.

Purpose of the Study:

  • To investigate the effects of ion-plasma nitriding on the structural, mechanical, and tribological characteristics of AISI M2 and AISI M41 high-speed steels.
  • To determine the optimal nitriding conditions for achieving superior properties in modified steel layers.

Main Methods:

  • Ion-plasma nitriding was applied to AISI M2 and AISI M41 steel samples.
  • Phase composition, microhardness, wear resistance, and layer depth were analyzed.
  • Structural transformations, including the presence of epsilon (ε) and gamma prime (γ') phases, were examined.

Main Results:

  • Optimal nitriding conditions (480-520 °C, up to 1 hour) resulted in a hardened layer (25-40 μm) with high-nitrogen martensite and minimal excessive nitrides.
  • Microhardness increased to 10-12 GPa, and wear resistance significantly improved.
  • The formation of ε and γ' phases contributed to enhanced strength and a reduced coefficient of friction.

Conclusions:

  • Ion-plasma nitriding is an effective method for enhancing the properties of high-speed steels.
  • The identified nitriding parameters optimize the formation of beneficial phases, leading to improved mechanical and tribological performance.
  • These findings support the advancement of heat treatment processes for HSS, promoting longer service life for cutting tools and components in mechanical engineering and metallurgy.