Accession Number:

AD0772075

Title:

Accommodation and Microcracking in the Plate Martensite of Fe-C Alloys and Steels.

Descriptive Note:

Final rept. 1 Sep 70-31 Aug 73,

Corporate Author:

LEHIGH UNIV BETHLEHEM PA DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s):

Report Date:

1973-10-22

Pagination or Media Count:

9.0

Abstract:

The influence of microstructural parameters, such as austenitic grain size, martensite plate size, and martensite morphology, on microcracking in the plate martensite of high carbon steel and Fe-C alloys, has been evaluated by quantitative metallographic techniques and heat treatments designed to systematically vary the extent of microcracking. Austenitizing Fe-C alloys within the austenite-cementite field was found to reduce microcracking effectively partly because of a morphology change. Systematic refinement of austenitic grain size showed that microcracking could be eliminated in as-quenched plate martensite by the production of very fine grains. In specimens with fine and intermediate grain sizes, microcracks at prior austenitic grain boundaries made up a large fraction, up to one-half, of the total microcracking present. Modified author abstract

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE