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Calculation Models of interlamellar spacing of Pearlite in High-Speed 82B Rod

Journal of Iron and Steel Research International 2008年第4期15卷 57-60页

作者： XU Jin-qiao LIU Ya-zheng ZHOU Shu-mei School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

With the investigated subject of 82B rod, the interlamellar spacings of pearlite at different isothermal transformation temperatures and different cooling rates during continuous cooling transformation were measured, and the effect of the isothermal transformation temperature and cooling rate on the interlamellar spacing was analyzed quantitatively. Moreover, the relationship models between undercooling and interlamellar spacing were presented by data regression. The experimental results show that the relationship between undercooling and reciprocal interlamellar spacing remains linear when the undercooling is not very large, or else, the interlamellar spacing tends to be constant and the relationship will deviate from linearity.

关键词： interlamellar spacing calculation model high-speed rod 82B

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New pearlitic steels for 21st century rail applications

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Baosteel Technical Research 2010年第S1期4卷 59-页

作者： R ORDONEZ C Isaac GARCIA Semih KALAY Anthony J DEARDO The Basic Metals Processing Research Institute Department of Mechanical Engineering and Materials Science University of Pittsburgh PittsburghPennsylvania 15261USA Transportation Technology Corporation Inc PuebloCO 81001 Department of Mechanical Engineering University of Oulu P.O.Box 4200(Linnanmaa) FIN-90014Finland

To improve competitiveness,the nation's railroads have increased the axle loads and speed of the *** has led to a rapid decrease in the life expectancy of premium rails through accelerated wear,rolling contact fatigue and *** counter this effect,the railroads need rails that exhibit better performance in these areas.A research program has been initiated to study the microstructural aspects of near-eutectoid steels that would improve these *** first phase of the work was to carefully characterize the existing commercial rail steels in terms of pearlite interlamellar spacing,steel cleanliness and the presence of pro-eutectoid cementite on prior-austenite *** characterizations were then correlated with both mechanical properties and overall rail *** second phase of the program was to develop a better microstructure through control of composition,thermomechanical processing and cooling *** was achieved through the use of laboratory-melted heats of experimental near-eutectoid compositions and a computer controlled MTS compression machine modified for axisymmetric compression testing and subsequent controlled *** optimum processing route for these new steels has been determined,and pilot-scale heats have been melted,hot rolled and cooled using the information gained from the MTS *** mechanical properties of these new steels have been determined and the rail performance tests are being conducted using laboratory-scale ***,these new rail steels will be tested under commercial conditions on the TTCI test track in Pueblo,*** paper will report on the alloy and processing design and resulting properties of the steels developed in this research *** for future rail compositions and processing to obtain improved properties and performance will be presented.

关键词： rail steels interlamellar spacing pearlite colony pro-eutectoid cementite

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维普期刊数据库

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The micro structure of high carbon low alloy steel for easy drawing

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Baosteel Technical Research 2010年第S1期4卷 59-页

作者： HU Donghui Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China

For better processing performance of high carbon low alloy steel wire rod,an investigation about the influence of cementite lamellar spacing on wire 'easy drawing' performance is *** is pointed out that too thin cementite lamellar spacing(<80 um) reduces the strain hardening level of wire drawing, and reduce the torsion performance of drawn wire at same *** the wire or wire rod from industrial production,compared with the micro-structure with troostite,the micro-structure with sorbite or sorbite mixed with pearlite is more suitable to the drawing process with high reduction ratio.

关键词： high carbon low alloy steel interlamellar spacing strain hardening level torsion performance

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