Martensite start temperature as a weldability index
- Colorado School of Mines, Golden, CO (United States)
- Amoco Research, Naperville, IL (United States)
Traditionally, welding experts have used carbon equivalent type expressions, which include chemical composition and cooling rates, to determine the susceptibility of a steel and its weldment to hydrogen damage. Experimental diagrams that map cracking versus non-cracking behavior as a function of hydrogen and carbon equivalent have also been proposed for practical applications. More recently, however, there is a growing concern that the hydrogen distribution across the weldment is non-uniform. Depending on the hardenability of the heat affected zone (base metal) and the weld metal, the two regions may undergo austenite decomposition, more specifically, martensite transformation at different times. As a result of the earlier or later transformation of the weld metal (compared with the heat affected zone), hydrogen may accumulate in the weld metal or in the heat affected zone. Selective distribution of hydrogen will lead to decreased or increased hydrogen damage susceptibility of the welded joint. By investigating the martensite start temperature of the weld metal and of the base metal, together with the amount of hydrogen pickup, the hydrogen outgassing behavior and distribution across the weldment can be modeled.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 442991
- Report Number(s):
- CONF-950682-; ISBN 0-87170-567-2; TRN: IM9712%%416
- Resource Relation:
- Conference: 4. international conference on trends in welding research, Gatlinburg, TN (United States), 5-9 Jun 1995; Other Information: PBD: 1996; Related Information: Is Part Of Trends in welding research: Proceedings of the 4. international conference; Smartt, H.B.; Johnson, J.A. [eds.] [Idaho National Engineering Lab., Idaho Falls, ID (United States)]; David, S.A. [ed.] [Oak Ridge National Lab., TN (United States)]; PB: 836 p.
- Country of Publication:
- United States
- Language:
- English
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