Abstract
The aim of this study is to investigate the effects of gadolinium addition on the microstructure and mechanical properties of duplex stainless steel (DSS) fabricated using a normal casting method. The oxygen content in the cast DSS alloy with gadolinium decreased because of the high reactivity of gadolinium with oxygen. The area fraction and size of non-intermetallic inclusions in the alloy decreased from 0.80±0.12% to 0.58±0.04% and from 6.9±0.7 to 5.8±0.4 μm upon gadolinium addition, respectively. Notably, the ultimate tensile strength and strain at break of the cast alloy significantly increased with the addition of gadolinium from 919±25 to 969±8 MPa and from 24.8±1.9% to 28.4±1.1%, respectively. The hardness of the cast alloy with gadolinium increased from 23.6±1.3 to 25.0±1.2 HRC. A significant increase in the impact energy of the cast alloy was observed and the brittle-to-ductile transition temperature slightly decreased by approximately 10 °C with the addition of gadolinium.
| Original language | English |
|---|---|
| Pages (from-to) | 255-262 |
| Number of pages | 8 |
| Journal | Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing |
| Volume | 658 |
| DOIs | |
| State | Published - 21 Mar 2016 |
Bibliographical note
Funding Information:This work was supported by Ministry of Trade, Industry & Energy of the republic of Korea (Grant no. 10052726 ) and the Nuclear Power Core Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (Grant no. 20141710201690 ).
Publisher Copyright:
© 2016 Elsevier B.V.
Keywords
- Casting
- Charpy impact test
- Inclusions
- Rare earth metal
- Stainless steel
- Tensile test