Grain refinement of high strength steels to improve cryogenic toughnessGrain-refining techniques using multistep heat treatments to reduce the grain size of five commercial high-strength steels were investigated. The goal of this investigation was to improve the low-temperature toughness as measured by Charpy V-notch impact test without a significant loss in tensile strength. The grain size of four of five alloys investigated was successfully reduced up to 1/10 of original size or smaller with increases in Charpy impact energy of 50 to 180 percent at -320 F. Tensile properties were reduced from 0 to 25 percent for the various alloys tested. An unexpected but highly beneficial side effect from grain refining was improved machinability.
Document ID
19850048165
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rush, H. F. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Metallic Materials
Report/Patent Number
AIAA PAPER 85-0749
Meeting Information
Meeting: Structures, Structural Dynamics, and Materials Conference