Vacuum heat treatment of sintered Mn steels: influence of martensite content on impact properties
Authors: Zendron, M.; Girardini, L.; Molinari, A.
Source: Powder Metallurgy, Volume 51, Number 3, September 2008 , pp. 237-244(8)
Publisher: Maney Publishing
Abstract:The influence of the martensite content on the impact properties of three through hardened Mn steels was investigated. When the maximum amount of martensite is 50%, impact properties are influenced by the martensite content through its effect on microhardness, according to the typical behaviour of a porous material having a tough microstructure. For higher amounts of martensite (up to 100%) a transition towards a brittle behaviour is observed. In this case, carbon content has a prevailing effect over the martensite content in determining the brittleness of materials. Steels with a medium low carbon content must be used to obtain a hardened but still deformable microstructure by through hardening and, when allowed by the actual cooling conditions, by sinterhardening.
Document Type: Research Article
Publication date: 2008-09-01
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