Discontinuous yielding in a low alloy steel

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SUMMARY

The discussion focuses on the phenomenon of discontinuous yielding in low alloy steel A706 grade during tensile testing. The participant notes that while A615 grade bars exhibit typical discontinuous yielding, the A706 grade, which is strengthened by manganese and vanadium, may demonstrate a greater degree of continuous yielding. The testing conditions for both grades are consistent, yet the A706 grade's alloying composition may influence its yielding behavior. There is a lack of literature addressing this specific effect on A706 grade steel.

PREREQUISITES
  • Understanding of tensile testing procedures
  • Knowledge of low alloy steel compositions, specifically A706 and A615 grades
  • Familiarity with thermomechanical treatment processes, such as the Tempcore process
  • Basic concepts of material science related to yield strength and deformation
NEXT STEPS
  • Research the effects of manganese and vanadium on the mechanical properties of low alloy steels
  • Investigate the Tempcore process and its impact on steel performance
  • Explore literature on continuous versus discontinuous yielding in various steel grades
  • Examine testing methodologies for assessing yield behavior in different alloy compositions
USEFUL FOR

Materials scientists, metallurgists, and engineers involved in the testing and application of low alloy steels, particularly those working with A706 and A615 grades in construction and manufacturing projects.

Quentin_alex
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What could prevent the discontinuous yield (upper and lower) points during a tensile test on a low alloy steel A706 grade?

Thanks.
 
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Are you seeing this in your testing? What is the project? Or is this for schoolwork?
 
Yes, I am seeing this in my testing. It is for a project.

We mostly run thermomechanically treated bars (Tempcore process) that are A615 grade. They show the typical discontinuous yielding of plain carbon steel. The A706 grade is a low alloy steel predominately strengthened by the addition of manganese and vanadium. I have not found literature on this effect. Could the alloying condition result in a greater degree of continuous yielding rather than discontinuous?

Also, testing conditions are the same for both types of bars.

Thanks.
 
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