WELDING CHARACTERISTICS OF 12NI-5CR-3MO MARAGING STEEL - I
Abstract
Results of tension and impact tests (after aging) on simulated weld- heat-affected-zone microstructures indicated that the tensile properties of the structures were not adversely affected by the weld-thermal cycles, but that the various structures exhibited a moderate general loss in toughness (4 to 14 ft-lb at +80 F) from that of the unwelded plate (45 ft-lb at +80 F). The austenite contents of the various heat-affected-zone regions ranged from 0 to 10 percent, the largest amount being present in the region heated to 1200 F. The results of metallographic examinations indicated that the weld-heat-affected zone is composed of regions of underaged martensite, properly aged martensite, and regions containing mixtures of underaged and overaged martensite with some retained austenite. The results of this study indicate that the mechanical properties of the heat-affected-zone in the 12Ni-5Cr-3Mo maraging steel are slightly poorer than those of the unwelded plate, but may be adequate if the original toughness of the base plate is high enough. However, before final conclusions concerning the base-metal weldability of 12Ni-Cr-Mo maraging steels can be drawn, the following work must be completed: (1) a determination of heat-affected-zone crack susceptibility, (2) additional impact tests of heataffected zones in higher toughness base plates, and (3) determinations of the effect of retained, or reverted, austenite on corrosion and fatigue properties.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1964
- Accession Number
- AD0600936
Entities
People
- A. M. Rathbone
- L. P. Connor
Organizations
- U.S. Steel