High-Strain Fatigue Properties of Cast ½Cr-Mo-V Steels

WJ Elder; JB Marriott; MC Murphy

doi:10.1520/STP38850S

SYMPOSIA PAPER Published: 01 January 1973

STP38850S

High-Strain Fatigue Properties of Cast ½Cr-Mo-V Steels

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Reverse-bend and push-pull tests at 550 C on small specimens of ½ Cr-Mo-V cast blocks have been used to obtain data relevant to crack formation in steam turbine components. A dwell period at peak tensile strain reduced the endurance, but increases in the length of the dwell did not reduce the endurance proportionately because the peak stress relaxed rapidly.

Neither forging, aging, nor differences in the normalizing cooling rates significantly affected the endurance of the ½Cr-Mo-V steels tested, but oil quenching to produce fully bainitic structures altered the slope of the strain/endurance relationship. The data obtained from tests in air appeared to give conservative life predictions for components in service in steam.

Author Information

Elder, WJ

Central Electricity Generating Board, Barnet, Herts, England

Marriott, JB

English Electric-AEI Turbine Generators Ltd., Leicester, England

Murphy, MC

Research and Development Laboratories, C. A. Parsons & Co., Ltd., Newcastle upon Tyne, England

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Details

Developed by Committee: E08

Pages: 320–331

DOI: 10.1520/STP38850S

ISBN-EB: 978-0-8031-5576-3

ISBN-13: 978-0-8031-5528-2

High-Strain Fatigue Properties of Cast ½Cr-Mo-V Steels

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