Study on Impact Fatigue Life of 42CrMo Steel with M+F Dual-Phase Structure |
| Journal |
Key Engineering Materials (Volumes 353 - 358) |
| Volume |
Progresses in Fracture and Strength of Materials and Structures |
| Edited by |
Yu Zhou, Shan-Tung Tu and Xishan Xie |
| Pages |
54-57 |
| DOI |
10.4028/www.scientific.net/KEM.353-358.54 |
| Online since |
September, 2007 |
| Authors |
Bo Lin He,
Ying Xia Yu,
Er Yu Shao
|
| Keywords |
Dual Phase Structures, Failure Mechanism, Fatigue Property, Impact Fatigue, Undissolved Ferrite |
| Abstract |
The effect of undissolved ferrite amount on impact fatigue properties and failure mechanism
were studied by using 42CrMo steel with subcritical quenching process The amount of undissolved
ferrite were 0%, 10% and 15%, respectively. The experimental results show that the existence of
undissolved ferrite can not only change the microstructure, but also increase the impact fatigue life The
impact fatigue life elongates with increasing of amounts of undissolved ferrite The grain can be fined by
using subcritical quenching process and the area of phase boundaries can also be greatly increased
because of undissolved spheroidal carbide. The martensite and carbide form can also be changed by
using subcritical quenching process The stress relaxation due to the moving of dislocations inside the
ferrite and the promotion of strength due to occurring of plastic deformation and the enwinded
dislocations are main reasons of improving the impact fatigue life. The impact fatigue life elongates
with the increase of amounts of undissolved ferrite before the amount of undissolved ferrite reaches 10%.
Under the experiment conditions, when the amount of undissolved ferrite is 10%, the impact fatigue life
will be the longest. |
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