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JOM

, Volume 7, Issue 2, pp 330–335 | Cite as

Isoembrittlement in Chromium and Molybdenum Alloy Steels During Tempering

  • Gopalkrishna Bhat
  • Joseph F. Libsch
Article

Abstract

Isoembrittlement curves depicting the influence of time and temperature in the range 800° to 1260°F (425° to 680°C) on the development of embrittlement in a commercial chromium alloy steel and a commercial molybdenum alloy steel are presented. Two distinct regions of embrittlement occur in the chromium alloy steel: 1—at 800° to 1000°F (425° to 540°C) and 2—in the region just below the lower critical temperature. Embrittlement is most pronounced at 800° to 1000°F, decreasing very rapidly with increasing temperature above this region, only to increase again as the lower critical temperature is approached. The data suggest two distinct modes of embrittlement with possible superposition of the two modes at extended embrittling times in the temperature range 1100° to 1150°F (590° to 620°C). While the molybdenum alloy steel shows little susceptibility to embrittlement at 800° to 1000°F (425° to 540°C), considerable embrittlement may occur just below the lower critical temperature.

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Copyright information

© The Minerals, Metals & Materials Society 1955

Authors and Affiliations

  • Gopalkrishna Bhat
    • 1
  • Joseph F. Libsch
    • 1
    • 2
  1. 1.Lehigh UniversityBethlehemUSA
  2. 2.Lepel High Frequency Laboratories Inc.Mew YorkUSA

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