Accession Number:

AD0257673

Title:

THE PROBLEM OF THE NATURE OF CRYSTALLINE CRACKS DURING THE WELDING OF AUSTENITIC STEELS AND ALLOYS

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1960-11-01

Pagination or Media Count:

1.0

Abstract:

The most effective means of preventing cracks in austenitic welded seams is to create conditions for the appearance of the second phase in the process of initial crystallization of the puddle. A positive effect is achieved regardless of the fact that the second phase is primary delta-ferrite, primary carbides of a ledeburite type, or another phase of eutectic origin. To ensure high resistance in an austenitic seam against the formation of hot cracks without resorting to the creation of a second phase, a way must be found for the maximum purification of the metal of the seam from additives which may be capable of causing the formation of a low-melting intercrystalline layer. A very strict limitation of the amount of such additives as P, Si, S, As, B, and Sn can sharply increase the resistance of austenitic welded seams against the formation of hot cracks. Moreover, an effective means of reducing the hotshortness of single-phase welded seams is their supplementary alloying with Mn, Mo, and W. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE