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Applicability Analysis of Assessment Methods for Morphological Parameters of Corroded Steel Bars
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How hair deforms steel.

Gianluca Roscioli1, Seyedeh Mohadeseh Taheri-Mousavi1,2, Cemal Cem Tasan3

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|August 9, 2020
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Summary
This summary is machine-generated.

Hardened steels fail when cutting soft materials due to complex interactions. Spatial variations in lath martensite structure cause mixed-mode cracking, leading to tool failure before significant wear occurs.

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Area of Science:

  • Materials Science
  • Tribology
  • Metallurgy

Background:

  • Steels with martensitic microstructures, high carbide content, and coatings are designed for hardness and wear resistance.
  • These tool steels fail when cutting softer materials like hair, cheese, or potatoes, an everyday observation lacking mechanistic understanding.
  • The complex interplay between materials and deformation conditions hinders comprehension of failure micromechanisms.

Purpose of the Study:

  • To elucidate the micromechanisms behind the failure of hardened steels when cutting softer materials.
  • To investigate the role of martensitic microstructure in the observed material failure.
  • To understand the transition from cutting to wear in tool steels.

Main Methods:

  • Interrupted cutting tests were performed using specialized micromechanical testing setups.
  • In situ electron microscopy was employed to observe deformation and fracture processes at the microscale.
  • Analytical and numerical investigations were conducted to complement experimental findings.

Main Results:

  • The spatial variation within the lath martensite structure was identified as a critical factor in material failure.
  • A mixed-mode II-III cracking phenomenon was observed.
  • This cracking occurred prior to the onset of significant material wear, explaining premature failure.

Conclusions:

  • The microstructural heterogeneity of lath martensite is the primary driver for premature failure in tool steels cutting soft materials.
  • Understanding this mixed-mode cracking mechanism is crucial for designing more robust cutting tools.
  • Further research into microstructure-property relationships can enhance tool performance and longevity.