Positive Effects of Hydrogen on the Plasticity of 2 1/4 Cr-1Mo Steel

Abstract

Steel (2 1/4 Cr-1Mo) and, for comparison, Armco iron were hydrogenated electrochemically in glycerine-phosphoric acid (2:1) electrolyte at 55 deg C. The microstructure was studied by optical microscopy and transmission electron microscopy. Compression tests at elevated temperatures of 650 deg C showed minor changes in the compressive stress for hydrogenated Armco iron, whereas a tremendous decrease of 50% of the compressive stress in 2 1/4 Cr-1Mo steel after hydrogenation was observed, which would improve the formability during processing. Our investigations indicate that the increase in plasticity of 2 1/4 Cr-1Mo steel strongly depends on the amount of hydrogen, as well as the strain rate, which can be explained by the difference in the mobility of dislocations. The positive effects of hydrogen on the plasticity at higher temperatures and the possible mechanisms which led to the distinct decrease in the compressive stress of 2 1/4 Cr-lMo steel in comparison to iron are discussed in detail taking into account dynamic recovery as well as recrystallization.

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Document Details

Document Type
Technical Report
Publication Date
Nov 15, 2002
Accession Number
ADA427496

Entities

People

  • D. Eliezer
  • D. Olson
  • D. Zander
  • I. Maroef

Organizations

  • Colorado School of Mines

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acids
  • Alloys
  • Chemical Engineering
  • Compression
  • Dislocations
  • Electron Microscopy
  • Elements
  • Grain Boundaries
  • Hardening
  • Hydrogen
  • Mechanical Properties
  • Plastic Properties
  • Softening
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Polymer Science and Technology
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics