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Effect of Heat Input on Cleavage Crack Initiation of Simulated Coarse Grain Heat-affected Zone in Microalloyed Offshore Platform Steel

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Journal of Iron and Steel Research International 2016年第10期23卷 1086-1095页

作者： Feng LU Guang-ping CHENG Feng CHAI Tao PAN Zhong-ran SHI Hang SU Cai-fu YANG School of Material Science and Engineering Anhui University of Technology Department of Structural Steel Central Iron and Steel Research Institute

The combined effects of martensite-austenite（MA）constituent and pearlite colony on cleavage crack initiation in the simulated coarse-grained heat-affected zone（CGHAZ）of V-N-Ti microalloyed offshore platform steel under different heat inputs were *** results of welding simulation,instrumented impact test,and quantitative analysis indicated that the size of the MA constituent decreased with the increase in cooling time,and by contrast,the size of the pearlite colony *** to Griffith theory,the critical sizes of cleavage microcracks were *** the increase of cooling time,the calculated microcrack size could be characterized by the size of the MA constituent first,and then fitted with the size of the pearlite ***,the calculated microcrack size variation was opposite to the microcrack initiation *** phenomenon is probably due to the combined effects of the MA constituent and pearlite colony with increasing the cooling time of the specimen′s temperature from800 to 500 ℃.

关键词： simulated coarse-grained heat-affected zone martensite-austenite constituent pearlite colony cleavage fracture V-N-Ti microaltoying

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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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