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RESEARCH PAPERS

Improving the Toughness of 3-1/2NiCrMoV Steam Turbine Disk Forgings

[+] Author and Article Information
R. L. Bodnar, K. S. Albano

Bethlehem Steel Corporation, Bethlehem, PA, 18016

K. A. Taylor

Homer Research Laboratories, Bethlehem Steel Corporation, Bethlehem, PA, 18016

S. A. Heim

BethForge Division, Bethlehem Steel Corporation, Bethlehem, PA, 18016

J. Eng. Mater. Technol 111(1), 61-70 (Jan 01, 1989) (10 pages) doi:10.1115/1.3226434 History: Received September 08, 1987; Online September 15, 2009

Abstract

Due to the in-service stress corrosion cracking of some 3-1/2NiCrMoV steam turbine disks, the Charpy V-notch toughness requirements for replacement forgings have dramatically increased in recent years. In response to the new requirements, several avenues for improving the toughness of 3-1/2NiCrMoV steel have been explored and are discussed in this paper. Improvements in forging practice, preliminary heat treatment, final heat treatment and composition are recommended which allow the new requirements to be met.

Copyright © 1989 by ASME
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