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Microstructural characterisation of powder metallurgy M35MHV HSS as a function of the processing route by S. Gimenez; I. Iturriza is a Engineering article available to read on EtoBox.

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The microstructure of powder metallurgy M35MHV (1.8C; 4.2V) HSS has been analysed as a function of the processing route. Four different sintering methods have been applied to obtain fully dense materials (density > 99% TD) from water atomised powders. Variables such as previous austenite grain size, type and amount of carbides and the phases present in the as-sinter condition have been analysed. Hot isostatic pressing (HIP) is giving a fully dense material at 1100 • C, 150 MPa and 15 min holding time with a very fine microstructure (mean grain size smaller than 3 m) as a result of a solid state densification process. As a supersolidus liquid phase sintering (SLPS) process, vacuum sintering needs 1220 • C to obtain full densification with a mean grain size of 16.9 m. Improving the sinterability by means of the use of nitrogen, atmosphere sintering is carried out at 1140 • C under industrial atmosphere (90% N 2 + 9% H 2 + 1% CH 4 ) giving a mean grain size of 10.0 m. Finally sinter-HIP under 4 bar of nitrogen is responsible for an optimum sintering temperature (OST) as low as 1100 • C. In specimens sintered under this last condition, the microstructure is rough with a total amount of

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Author

S. Gimenez; I. Iturriza

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0924-0136)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)