Impact of a multi-step heat treatment on different manufacturing routes of 18CrNiMo7-6 steel

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Abstract

Effect of an optimized multi-step heat treatment routine on conventional (machining from wrought bar stock) and alternate manufacturing routes (hot forging and cold rotary forging) for producing flat cylindrical-shaped machine drive components from 18CrNiMo7-6 steel was investigated. The microstructure and mechanical properties of the final component manufactured using these three different routes were analyzed using optical microscopy, electron backscatter diffraction (EBSD), hardness testing, electro-thermal mechanical testing (ETMT), and rotary bending fatigue testing (RBFT) before and after implementing the multi-step heat treatment. It was found that the multi-step heat treatment transformed the as-received microstructure into the tempered martensitic microstructure, improving hardness, tensile, and fatigue properties. The heat treatment produced desired properties for the components manufactured by all three different routes. However the cold rotary forging, which is the most material utilizing route over the others, benefited the most from the optimized heat treatment.

Original languageEnglish
Pages (from-to)3009–3029
Number of pages21
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume51
Issue number6
Early online date29 Mar 2020
DOIs
Publication statusE-pub ahead of print - 29 Mar 2020

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Keywords

  • hot forging
  • cold rotary forging
  • heat treatment
  • microstructure
  • tensile properties
  • fatigue properties

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