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《Journal of Shanghai Jiaotong University》 1989-04
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A Study of the Mechanical Properties of Martensite--Bainite Dual Phase Structure of Ball Bearing Steel

Xu Zuoren;Huang Kingjia  
An investigation was carried out about the various martensite-bainitedual phase structures and their strength and toughness at different volumefraction ratio when isothermally transformed at temperatures above or below.By way of fracture analysis, a discssion is presented in this paper on howfractography and fracture mechanism change with the variation of the volumefraction of bainite. The best combination of strength and toughness is achieved by the mar-tensite-bainife dual phase structure transformed isothermally at 220℃ for 4hrs. Its bending strength is about 1470 MPa and its impact toughness exceedstwo times over that of tempered martensite. Its fracfure tougness is enhancedby nearly 70%. The underdeveloped mechanical properties are better utilized.This is due to the thermally-formed prior martensite partitioning the under-cooled austenite grains, refining the effective grain size and lath dimensionof bainite successivelly transformed. The lower the transformation temper-aturesof bainite is, the finer the lath dimensions and the more dispersed thebainitic carbides would be obtained. All of these are advantageous to mech-anical properties of the dual phase structure.
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【References】
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2 CHEN Le-xiang,SONG De-hui (Politics Institute,Sichuan University,Chengdu,Sichuan 610064;Politics Education Institute,Sichuan Normal University,Chengdu,Sichuan 610068,China);Perfection of Income Distribution Mechanism to Build Harmonious Society[J];Journal of Sichuan Normal University(Social Sciences Edition);2006-01
3 MING Jian (College of Food Science, Southwest Agricultural University, Beibei,Chongqing 400716, China);REVELATIONS OF THE DRASTIC CHANGES IN EASTERN EUROPE AND FORMER SOVIET UNION TO OUR PARTY UNDER THE NEW HISTORIC CONDITIONS[J];Journal of Sichuan Institute of Animal Husbandry and Veterinary Medicine;2005-02
4 CHEN Xue-jun(Rongchang Party School of CPC,Rongchang,Chongqing 402460,China);A NEW-TYPE INDUSTRIALIZATION ROAD FOR COUNTY REGIONAL ECONOMY[J];Journal of Sichuan Institute of Animal Husbandry and Veterinary Medicine;2005-03
5 WANG Quan-sheng(Law School,Shandong University Weihai Branch,Weihai Shandong 264209,China);The Evaluation of the Legislative Legitimacy[J];Legal Forum;2008-02
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