SEDL / STP / STP369-EB / STP43758S

Aging Mechanisms in Precipitation-Hardening Stainless Steels

Wilkins, J. C.
Senior metallurgist, metallurgist, and senior research engineer, Research and Technology, Armco Steel Corp., Middletown, Ohio.

Pence, R. E.
Senior metallurgist, metallurgist, and senior research engineer, Research and Technology, Armco Steel Corp., Middletown, Ohio.

Perry, D. C.
Senior metallurgist, metallurgist, and senior research engineer, Research and Technology, Armco Steel Corp., Middletown, Ohio.

Pages: 11    Published: Jan 1965

Download this paper for $25 PDF (916K)          View License Agreement
Abstract

The mechanism of age hardening in the 17-7PH and PH15-7Mo stainless steels was studied by electron microscopy and “selected area” electron diffraction using direct-transmission thin-foil techniques and the extracted-particle carbon-replica techniques. The precipitates in the specimens aged from 6 to 24 hr at 1050 F were NiAl, and at 100 hr they were NiAl and Ni³Al. The presence of these precipitates was indicated by moiré patterns, round disks, and strain areas.