| CREEP LIFE PREDICTION OF ALLOY 718 FOR AUTOMOTIVE
ENGINE MATERIALS |
| Yu Sik Kong1, Jiyoung Yu2, Young Whan Park1 |
1Pukyong National University
2Hyundai Steel Company |
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| ABSTRACT |
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This study was carried out to investigate the creep life at the high temperature of the Alloy 718 for automotive
engine components using the initial strain parameter method (ISPM). Creep tests have performed at elevated temperatures in
the range of 550 oC to 700 oC in this work. We also carried out constant stress creep tests. The initial strains were measured
during 1 minute after loading. Both the creep stress and rupture time depend on the initial strain. We calculated the creep life
of Alloy 718 by using the creep life prediction equations obtained from the ISPM. Then, we compared the creep life predicted
by the ISPM to the Larson-Miller parameter (LMP). The experimental rupture time and the calculated rupture time by using
the ISPM agreed with a confidence level of 95 %. The creep life predicted by using the ISPM was in very good agreement
with the creep life predicted using the LMP method. |
| Key Words:
Initial Strain Parameter Method (ISPM), Elevated temperatures, Ni-based Alloy 718, Creep life prediction,
Larson-Miller Parameter (LMP) |
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Corresponding Author.
Young Whan Park , Email. 
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