Development of ultra high strength nano-Y(2)O(3) dispersed ferritic steel by mechanical alloying and hot isostatic pressing
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Development of ultra high strength nano-Y(2)O(3) dispersed ferritic steel by mechanical alloying and hot isostatic pressing
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| Creator |
Karak, S K
Chudoba, T Witczak, Z Lojkowski, W. Manna, Indranil |
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| Subject |
Processing Science
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| Description |
The present investigation aims to develop ultra high strength ferritic steels through consolidation of mechanically alloyed powders of 1.0 wt% nano-Y(2)O(3) dispersed 83.0Fe-13.5Cr-2.0Al-0.5Ti (alloy A), 79.0Fe-17.5Cr-2.0Al-0.5Ti (alloy B), 75.0Fe-21.5cr-2.0Al-0.5Ti (alloy C) and 71.0Fe-25.5Cr-2.0Al-0.5Ti (alloy D) alloys (all in wt%) by hot isostatic pressing (HIP) at 600.800 and 1000 degrees C using 1.2 GPa pressure for 1 h. Following this mechano-chemical synthesis and consolidation, extensive effort has been undertaken to characterize the microstructural evolution by X-ray diffraction, scanning and transmission electron microscopy and energy dispersive spectroscopy. Mechanical properties including hardness, compressive strength, Young's modulus and fracture toughness were determined using nano-indentation and universal testing machine. The present ferritic alloys record extraordinary levels of compressive strength (2012-3325 MPa), Young's modulus (230-295 GPa). fracture toughness (4.6-21.8 MPa root m) and hardness (15.5-193 GPa), and measure up to 2-3 time; greater strength with a lower density (similar to 7.4 Mg/m(3)) than that of other oxide dispersion strengthened ferritic steels (<1200 MPa) or tungsten based alloys (<2200 MPa). The novelty of these alloys lies in the unique microstructure comprising uniform dispersion of 20-30 nm Y(2)O(3) (ex situ) or Y(2)T(2)O(7) (in situ) particles in higher volume fraction in high-Cr ferritic matrix. (C) 2011 Elsevier B.V. All rights reserved.
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| Publisher |
Elsevier
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| Date |
2011-09
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/270/1/MaterScEngA_528_(2011)7475%E2%80%937483.pdf
Karak, S K and Chudoba, T and Witczak, Z and Lojkowski, W. and Manna, Indranil (2011) Development of ultra high strength nano-Y(2)O(3) dispersed ferritic steel by mechanical alloying and hot isostatic pressing. Materials Science and Engineering A - Structural Materials Properties Microstructure and Processing , 528 (25-26). pp. 7475-7483. ISSN 0921-5093 |
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| Relation |
http://cgcri.csircentral.net/270/
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