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中南大学学报(英文版)

Journal of Central South University

Vol. 11    No. 3    September 2004

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Effects of heat treatment on microstructure and mechanical
properties of Fe-Co-Ni-Cr-Mo-C alloy
ZHU Yuan-zhi(朱远志)1, YIN Zhi-min(尹志民) 1, ZENG Yu(曾 渝) 1,
HUANG Ji-wu(黄继武) 1, Li Xue-qian(李学谦) 2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:A kind of Fe-Co-Ni-Cr-Mo-C alloy was designed for valve seat use. The effects of the quenching temperature,tempering time and tempering temperature on the mechanical properties and microstructure of the alloy were investigated.The results show that the hardness decreases, while tensile strength (σb), transverse rupture strength (σbb) and impact toughness(Kic) increase after the alloy is quenched and tempered. The best complex property (σb, 446 MPa;σbb,793MPa;Kic, 2.96 J/cm2) can be obtained when the alloy is quenched at 1 100℃and tempered at 650℃. The results of X-ray diffraction and energy dispersive X-ray analysis (EDX) show that the major streng-thening phases are carbides such as (Fe,Cr)7C3and Fe2MoC. The obvious secondary hardening appears when the alloy is tempered at 550℃,which re-sults from the precipitated carbides of Cr and Mo in the alloy from the matrix and the heat-resistant retained austenite .

 

Key words: valve seat; Fe-Co-Ni-Cr-Mo-C alloy; heat treatment; microstructure; property

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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