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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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