Table of Contents

Section
I Introduction
II General conclusions from program
III Phase I: step cooled embrittlement experiments and
      material characterization
IV Phase II: isothermal embrittlement experiments
V The effect of de-embrittlement
VI The effect of specimen notch orientation
VII Prediction of long term isothermal embrittlement
VIII The effect of repeated de-embrittlement on
      isothermal embrittlement at 875 deg F
IX The effect of strength level and structure on
      temper embrittlement
X The segregation of elements to grain boundaries
      in Cr-Mo steels after 20,000 hr isothermal
      embrittlement assessed by Auger methods
XI Fracture toughness evaluation (JIc) of
      unembrittled and isothermally embrittled sample
      no. 75
XII A study of the effect of high pressure hydrogen on
      the temper embrittlement characteristics of Cr-Mo
      steels
XIII Isothermal embrittlement of 1-1/4Cr - 1/1Mo and
      3Cr - 1Mo samples at 875 deg F
XIV Acknowledgements
XV References
Tables 1 to 29
Figures 1 to 68
Appendix: Discussion of the Charpy test
(a) Sources of error in Charpy impact test data
(b) The Charpy specimen fracture appearance
(c) Experimental scatter in the 40 ft-lb transition
     temperature
Figures A1 to A4

Abstract

Presents the results of the study of repeated de-embrittlement on two isothermally embrittled steels and the effect of strength level and structure on the isothermal embrittlement of one sample of steel. Subsidiary experiments performed on Phase II of the program include the effect of high pressure hydrogen (3500 psig) on temper embrittlement. Coverage includes: the effect of specimen notch orientation; the effect level and structure on temper embrittlement; a study of the effect of high pressure hydrogen on the temper embrittlement characteristics of Cr-Mo steels.

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Published
Document Type	Standard
Status	Current
Publisher	American Petroleum Institute
Pages
ISBN