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Compilation and indexing terms, © 2013 Elsevier Inc.
14.
Accession number: 20131016090057
Title: Effect of austempering processing parameters on microstructure and hardness of nodular
cast iron dense bar
Authors: Wang, Jin-Cheng1 ; Li, Wei-Ming2 ; Zhang, Zhong-Ming1, 2 ; Xu, Chun-Jie2/王锦程;李
伟明;张忠明;徐春杰
Author affiliation: 1 State Key Laboratory of Solidification Processing, Northwestern
Polytechnical University, Xi'an 710072, China
2 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048,
China
Corresponding author: Wang, J.-C. ([e-mail])
Source title: Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment
Abbreviated source title: Cailiao Rechuli Xuebao
Volume: 34
Issue: 1
Issue date: January 2013
Publication year: 2013
Pages: 70-75
Language: Chinese
ISSN: 10096264
CODEN: JRXUDO
Document type: Journal article (JA)
Publisher: Editorial Office of Transactions of Materials, 18 Xueqing Road, Beijing, 100083, China
Abstract: In order to find the optimum austempering process parameters for QT500-7 nodular
cast iron dense bar produced by horizontal continuous casting(HCC), the orthogonal experiment
was used to optimize the parameters, i. e austenitizing temperature, austenitizing time,
austempering temperature and austempering time, according to the microstructure and
hardness of the dense bar. The results show that the major factors influencing hardness of the
austempered nodular cast iron dense bar are austempering temperature and austenitizing
temperature. As the temperatures increases, the fraction of retained austenite increases and the
hardness discreases. The highest hardness of the austempered QT500-7 dense bar is obtained by
using following process parameters: austenitizing temperature and austempering temperature
are 840°C and 280°C, and austenitizing time and austempering time are 60 min and 100 min,
respectively. The microstructure of the dense bar under the optimum austempering process is
composed of thin acicular ferrite and retained austenite, and the hardness is 476 HBW.
Number of references: 13
Main heading: Nodular iron
Controlled terms: Continuous casting - Hardness - Microstructure
Uncontrolled terms: Acicular ferrite - Austempering - Austempering process -
Austempering temperature - Austenitizing - Austenitizing temperature - HCC -
Horizontal continuous casting - Major factors - Orthogonal experiment - Orthogonal
test - Process parameters - Processing parameters - Retained austenite
Classification code: 421 Strength of Building Materials; Mechanical Properties - 534.2