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Sinter-hardening with concurrent improved plasticity in iron alloys induced by spark plasma sintering

Published online by Cambridge University Press:  01 May 2014

Chao Yang ,
Tian Wei ,
Xuebing Dong ,
Yuhua Li ,
Shengguan Qu  and
Xiaoqiang Li
Chao Yang*
Affiliation:
School of Mechanical & Automotive Engineering, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People's Republic of China
Tian Wei
Affiliation:
School of Mechanical & Automotive Engineering, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People's Republic of China
Xuebing Dong
Affiliation:
School of Mechanical & Automotive Engineering, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People's Republic of China
Yuhua Li
Affiliation:
School of Mechanical & Automotive Engineering, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People's Republic of China
Shengguan Qu
Affiliation:
School of Mechanical & Automotive Engineering, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People's Republic of China
Xiaoqiang Li
Affiliation:
School of Mechanical & Automotive Engineering, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We report on the occurrence of sinter-hardening with concurrent improved plasticity in fine-grained Fe79.3Mo4.5P8.1C6.75B1.35 bulk alloys fabricated by spark plasma sintering (SPS) of metallic glass composite powder. When the sintering temperature is higher than the austenite transformation temperature, the as-fabricated bulk alloys are composed of expected wattle martensite plus Fe3P, Fe7C3, and Fe3Mo3C. Meanwhile, the martensite-containing bulk alloys exhibit increased hardness, fracture strength as well as concurrent improved plasticity. The fracture stress and strain of the martensite-containing bulk alloys are as high as 2573 MPa and 8.6%, respectively. The formation of the martensite microstructure is attributed to that high sintering temperature leads to the austenitization transformation and consequently formed austenite partially transforms into martensite under rapid cooling rate provided by SPS system. The results obtained provide insight into fabrication of iron alloys with good mechanical property by powder metallurgy.

Keywords

iron alloysfine-grained materialssinter-hardeningspark plasma sinteringcrystallization
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 8 , 28 April 2014 , pp. 981 - 988
Copyright
Copyright © Materials Research Society 2014 

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