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Development of P/M Fe–P soft magnetic materials

Content Provider	Springer Nature Link
Author	CHAURASIA, S K PRAKASH, UJJWAL MISRA, P S
Copyright Year	2012
Abstract	Phosphorous is treated as an impurity in conventional steels owing to segregation of phosphorous and formation of brittle phosphides along the grain boundaries. It is responsible for cold and hot shortness in wrought steels. In conventional powder metallurgy, involving compaction and sintering, high phosphorous content (up to 0·7%) in Fe-based alloys exhibit attractive set of mechanical and magnetic properties. These powder-processed alloys suffer from increasing volumetric shrinkage during sintering as phosphorous is increased beyond 0·6%. Thus both cast as well as conventional powder metallurgy routes have their own limitations in dealing with iron–phosphorous alloys. Hot-powder forging was used in the present investigation for the development of high-density soft magnetic materials containing 0·3–0·8% phosphorous to overcome these difficulties. It was observed that phosphorous addition improves the final density of the resulting product. It was further observed that hot-forged iron–phosphorous alloys have excellent hot/cold workability and could be easily shaped to thin strips (0·5–1·0 mm thick) and wires (0·5–1·0 mm diameter). The powder hot-forged alloys were characterized in terms of microstructure, porosity content/densification, hardness, soft magnetic properties and electrical resistivity. Magnetic properties such as coercivity 0·35–1·24 Oe, saturation magnetization 14145–17490 G and retentivity 6402–10836 G were observed. The obtained results were discussed based on the microstructures evolved.
Starting Page	191
Ending Page	196
Page Count	6
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	35
Issue Number	2
e-ISSN	09737669
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-05-03
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fe–P alloys soft magnetic materials Hot–powder forging thermomechanical processing resistivity magnetic properties Materials Science Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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