Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 558, Issue -, Pages 566-571Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.08.050
Keywords
Spray forming; High speed steel; Microstructure evolution; Mechanical properties
Categories
Funding
- National Basic Research Program of China (973 Program) [2011CB606303, 2010CB631205]
- Natural Science Foundation of China [51074145, 51001049]
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Spray formed T15 high speed steel (HSS) billets were deposited using a state-of-the-art twin-atomiser spray forming facility. The effects of post thermo-mechanical processing (hot isostatic pressing and hot forging) and heat treatment on the microstructure and mechanical properties were investigated. As-deposited billet has a density over 993% of the theoretical value and no measurable macro-segregation was observed. The microstructure consists of the equiaxed grains with mean size of similar to 18 mu m and MC- and M6C-type carbides non-uniformly distributed inside the grains and along the grain boundaries. After optimal thermo-mechanical processing and heat treatment, the microstructure was composed of equiaxed fine tempered martensites, and refined M6C and MC spherical carbides particles uniformly distributed along the grain boundaries and inside the grains. The hardness reached HRC68 after thermo-mechanical processing, and the corresponding impact toughness and bending strength reached 27 J/cm(2) and 4600 MPa respectively. Although HIP cannot increase the bending strength significantly, it can effectively improve the impact toughness through refining and globurizing carbides. (C) 2012 Elsevier B.V. All rights reserved.
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