Effect of overaging on mechanical properties and stress corrosion cracking of HY-180M steel |
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Authors: | Sathish Rao Bala Desmond Tromans |
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Affiliation: | (1) Dominion Bridge Co. Ltd, Lachine, PQ;(2) Department ofMetallurgical Engineering, University of British Columbia, V6T 1W5 Vancouver, BC, Canada |
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Abstract: | The tensile properties, fracture toughness and stress corrosion cracking (SCC) behavior of HY-180 M steel at 22 °C were studied
after final 5 h overaging treatments >510 ≤650 °C. SCC tests were conducted for 1000 h with compact tension specimens in aqueous
3.5 pct NaCl solutions at a noble (anodic) potential of −0.28 VSHE ( −0.48 VAg/AgC1) and a cathodic protection potential of −0.80 VSHE (−1.0 VAg/AgC1). The SCC resistance improved at aging temperatures >565 °C, the most significant improvement being at −0.80 VShe, especially after 650 ° aging whereK
ISCC was raised to at least 110 MPa · m1/2. However, this was at the expense of mechanical properties. Provided low crack propagation rates of ∼3 X 10−11 m/s at −0.80V
SHEmay be tolerated, the best compromise between strength, toughness, and SCC resistance was obtained after 594 °C aging. Under
these conditions, stress intensities as high as ∼ 110 MPa · m1/2 can be used, with a yield strength of ∼ 1150 MPa and fracture toughness of ∼ 170 MPa · m1/2. The retained austenite content after aging increased with aging temperature up to 25 pct by vol at 650 °C. It appeared to
correlate with improved SCC resistance, but other microstructural effects associated with aging may be involved.
Formerly Research Associate with theDepartment of Metallurgical Engineering , University of BritishColumbia |
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