Abstract
The anisotropic mechanical behavior of quenched and tempered 4340 steel with different Ca contents was investigated by means of a macro/micrograph analysis, Charpy impact test, and rotating bending fatigue test. The 4340 steel with Ca added formed small spherical (Ca,Mn)S inclusions and effectively decreased both the inclusion size and the aspect ratio (length to width) of the MnS inclusions as compared to the Ca-free 4340 steel. The anisotropic impact value and fatigue strength were effectively improved due to the Ca addition that prevented the growth of MnS inclusions, which provided increased resistance against deformation to maintain a spherical shape because the elongated MnS inclusions acted as a crack propagation path and promoted the crack propagation due to higher stress concentrations.
| Original language | English |
|---|---|
| Pages (from-to) | 2658-2664 |
| Number of pages | 7 |
| Journal | Journal of Materials Engineering and Performance |
| Volume | 24 |
| Issue number | 7 |
| DOIs | |
| State | Published - 2015.07.24 |
Keywords
- anisotropic mechanical behavior
- low-alloy steel
- sulfide control
Quacquarelli Symonds(QS) Subject Topics
- Materials Science
- Engineering - Mechanical
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