Accession Number:

ADA011909

Title:

The Effect of Quench Rate on the Properties and Morphology of Ferrous Martensite.

Descriptive Note:

Technical rept.,

Corporate Author:

RENSSELAER POLYTECHNIC INST TROY N Y SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1975-03-01

Pagination or Media Count:

52.0

Abstract:

The effect of high quench rate on the M sub s temperature, percent transformed, martensite morphology and austenite hardness has been studied for several Fe-Ni-C steels. For these steels the quench rate was varied only in the austenite region. The M sub s temperature was found to increase with increased quench rate for both high and low carbon steels while the percent transformation increased or decreased depending upon the morphology of the steel. Parallel aligned plate structures were observed which resemble a twinned lath morphology. It was demonstrated that the actual difference between this morphology and a true lath structure. The morphology changes were compared to the measured changes in martensite properties in order to identify the mechanism of the morphology shift. It was concluded that for these alloys the morphology was controlled by the austenite shear mode.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE