Accession Number:

ADA007360

Title:

The Effect of Grain Size and Retained Austenite on the Ductile-Brittle Transition of a Titanium-Gettered Iron Alloy.

Descriptive Note:

Technical rept.,

Corporate Author:

CALIFORNIA UNIV BERKELEY DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

1975-01-01

Pagination or Media Count:

22.0

Abstract:

The effect of microstructural changes on the ductile-brittle transition temperature DBTT was studied in a titanium-gettered Fe-8Ni-2Mn-0.15Ti alloy. A fairly strong grain size dependence of the transition temperature was found. Grain size refinement from approximately 38 micrometers ASTM No. 6.5 to approximately 1.5 micrometers ASTM No. 15.5 through a four-step thermal treatment lowered the transition temperature by approximately 162C. A small amount of retained austenite was introduced to this grain-refined microstructure, and the transition temperature was suppressed by an additional 100 approximately 150C. The suppression of the DBTT due to retained austenite was smaller when introduced into a large grained structure approximately 64C. The distribution and stability of retained austenite were also studied.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE