Microstructure, thermal, and mechanical characterization of rapidly solidified high strength Fe 84.3 Cr 4.3 Mo 4.6 V 2.2
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J. Eckertb) Leibniz Institute for Solid State and Materials Research, Dresden (IFW Dresden), Institute for Complex Materials, D-01171 Dresden, Germany; and Technical University (TU) Dresden, Institute of Materials Science, D-01062 Dresden, Germany
H-J. Seifert Technical University (TU) Bergakademie Freiberg, Institute of Materials Science, D-09599 Freiberg, Germany (Received 8 January 2010; accepted 1 March 2010)
Systematic microstructural and mechanical investigations of the Fe84.3Cr4.3Mo4.6V2.2C4.6 alloy cast under special manufacturing conditions in the as-cast state and after specific heat treatment are presented to point out that the special manufacturing of the alloy led to high compression strength (up to 4680 MPa) combined with large fracture strain (about 20%) already in the as-cast state. One select chemical composition of the alloy, which was mentioned previously [Ku¨hn et al., Appl. Phys. Lett. 90, 261901 (2007)] enhanced mechanical properties already in the as-cast state. Furthermore, that composition is comparable to commercial high-speed steel. By the special manufacturing used, a high purity of elements and a high cooling rate, which led to a microstructure similar to a composite-like material, composed of dendritic area (martensite, bainite, and ferrite) and interdendritic area (e.g., complex carbides). The presented article demonstrates an alloy that exhibits already in the as-cast state high fracture strength and large ductility. Furthermore, these outstanding mechanical properties remain unchanged after heating up to 873 K. I. INTRODUCTION
The present alloy exhibits fine composite-like microstructure already in the as-cast state. The material contains a high amount of alloying elements [molybdenum (Mo), chromium (Cr), and vanadium (V)]. The chemical composition of the investigated alloy is based on the previous research of Ku¨hn et al.1 In Ref. 1 the alloy is characterized in the as-cast state. The composition and the mechanical properties of the present Fe alloy in the as-cast state is comparable to high-speed steels (HSS, AISI M10),2–5 requiring several mechanical properties for several applications such as tool steels. The material is characterized by good wear resistance, favorable warm hardness, and good hightemperature properties.5–7 The main difference between commercial HSS and the present alloy is the manufacturing process and thus the a)
Address all correspondence to this author. e-mail: [email protected] b) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs. org/jmr_policy DOI: 10.1557/JMR.2010.0158 1164
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J. Mater. Res., Vol. 25, No. 6, Jun 2010 Downloaded: 13 Mar 2015
as-cast microstructure of the present alloy. To obtain the required properties of tool steels, commercial manufacturing of HSS includes tempering and quenching.5–9 These manufacturing procedures need a relative long time and are cost inte
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