The effect of preheat on the microstructure, hardness and toughness of HT-9 weldments

The welding preheat temperature is shown to significantly affect the dynamic fracture behavior of a 12CR-1Mo steel (HT-9) weld metal. A decreased preheat, effecting a faster weld metal cooling rate, results in an increased upper shelf energy and lower ductile-brittle transition temperature with no c...

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Bibliographic Details
Published in:Journal of nuclear materials 1984-05, Vol.122 (1), p.134-139
Main Authors: Lechtenberg, T.A., Foulds, J.R.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Joining, thermal cutting: metallurgical aspects
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
Welding
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Summary:The welding preheat temperature is shown to significantly affect the dynamic fracture behavior of a 12CR-1Mo steel (HT-9) weld metal. A decreased preheat, effecting a faster weld metal cooling rate, results in an increased upper shelf energy and lower ductile-brittle transition temperature with no charge in weld metal. SEM examinations indicate a decreased dendrite spacing and lower interdendritic segregation with a faster cooling rate. It Is evident that the varying interdendritic ferrite content and morphology and the dendrite spacing, both controlled by the cooling rate, play a significant role on the weld metal dynamic fracture behavior. The results suggest the lowest preheat compatible with good welding practice be used for maximum benefits to weld metal fracture mechanics.
ISSN:0022-3115
1873-4820
DOI:10.1016/0022-3115(84)90584-1