Effect of Phosphorus on Microstructure and Mechanical Properties of Iron-Based Alloys Processed Through Powder Forging

Effect of Phosphorus on Microstructure and Mechanical Properties of Iron-Based Alloys Processed... In sintered as well as cast steels presence of phosphorus is a problem as it induces brittleness in the steels and deteriorates the mechanical properties. The present research work describes a P/M route to produce ductile iron phosphorous alloys. Alloys with phosphorus contents 0, 0.35, 0.65, 1.3, 2, and 3 wt.% were developed by a powder forging route. Care was taken to ensure that no liquid-phase formation takes place during processing. First, a master alloy powder containing 5 wt.% phosphorus was produced by reacting water-atomized iron (Fe) powder with orthophosphoric acid. The iron phosphate (master alloy) particles were then blended with the iron powder. The blended powders were placed in a mild steel can and hot forged at 1323 K in a flowing hydrogen atmosphere. Hot-forged slabs were re-forged to final density and then homogenized at 1373 K for 2 h. Increasing the phosphorus content led to an increase in strength and hardness of forged alloys. Alloys with phosphorus contents < 1 wt.% exhibited significant ductility, suggesting that the presence of phosphorus did not cause the expected embrittlement. The solid-state processing used may lead to development of ductile phosphorus-containing alloys with attractive properties. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallography, Microstructure, and Analysis Springer Journals

Effect of Phosphorus on Microstructure and Mechanical Properties of Iron-Based Alloys Processed Through Powder Forging

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC and ASM International
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology
ISSN
2192-9262
eISSN
2192-9270
D.O.I.
10.1007/s13632-017-0406-1
Publisher site
See Article on Publisher Site

Abstract

In sintered as well as cast steels presence of phosphorus is a problem as it induces brittleness in the steels and deteriorates the mechanical properties. The present research work describes a P/M route to produce ductile iron phosphorous alloys. Alloys with phosphorus contents 0, 0.35, 0.65, 1.3, 2, and 3 wt.% were developed by a powder forging route. Care was taken to ensure that no liquid-phase formation takes place during processing. First, a master alloy powder containing 5 wt.% phosphorus was produced by reacting water-atomized iron (Fe) powder with orthophosphoric acid. The iron phosphate (master alloy) particles were then blended with the iron powder. The blended powders were placed in a mild steel can and hot forged at 1323 K in a flowing hydrogen atmosphere. Hot-forged slabs were re-forged to final density and then homogenized at 1373 K for 2 h. Increasing the phosphorus content led to an increase in strength and hardness of forged alloys. Alloys with phosphorus contents < 1 wt.% exhibited significant ductility, suggesting that the presence of phosphorus did not cause the expected embrittlement. The solid-state processing used may lead to development of ductile phosphorus-containing alloys with attractive properties.

Journal

Metallography, Microstructure, and AnalysisSpringer Journals

Published: Nov 6, 2017

References

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