Accession Number:

AD0258793

Title:

AN INVESTIGATION ON DEVELOPMENT OF AS-CAST GRAIN REFINER FOR CAST STEEL

Descriptive Note:

Corporate Author:

CASE INST OF TECH CLEVELAND OHIO

Personal Author(s):

Report Date:

1960-12-01

Pagination or Media Count:

1.0

Abstract:

Various substances were added to molten low carbon steel in an attempt to develop methods by which the as-cast structure of steel could be grain-refined. The selection of the additions was based either on their capability to provide finely distributed centers for heterogeneous nucleation or on their potency of producing appreciable constitutional supercooling to interrupt continuous growth of the first formed crystallites. Considerable effort was directed toward developing suitable means of delineating the as-cast grain size from various structural features which persisted through the allotropic transformation when cooling to room temperature. As inoculants, TiC and V-B were particularly effective, while Nb and Ti proved to be suitable solute additions to interrupt grain growth. Mechanical properties were determined for those castings in which appreciable grain refinement of the as-cast structure was obtained. Generally, an improvement in strength was obtained which, however, was accompanied by a loss in ductility and notch toughness. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE