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Peculiarities of Structural Transformations in HAZ Metal of Rail Steel M76 Joint Produced by Flash-Butt Welding

Journal of Physical Science and Application 2016年第5期6卷 54-65页

作者： Georgy Grigorenko Valery Kostin Victor Zhukov Tetiana Zuber E.O. Paton Electric Welding Institute NASU 11 Kazimira Malevicha str. Kyiv 03680 Ukraine

The railway transport is one of the main types of communications in the world. Analysis of service conditions of the most critical elements of the railway transport rolling stock （mils, wheels and tyres） shows that one of the main factors determining their reliability and service life is the structural-phase state of steel, which is formed in the process of its producing. Complication of service conditions leads to the more severe requirements, specified by the consumers, where the high level of strength and hardness should be combined with high values of ductility and toughness. Realization of these requirements is possible only at the integrated approach to the improvement of technology of their production on the basis of profound knowledge in kinetics of austenite decay processes of structure formation and its contribution to the mechanical properties. With the formation of mainly bainite-martensite.structures in the HAZ （heat-affected zone） metal of welded joints of these steels and saturation of this region with diffusive hydrogen their susceptibility to the cold cracking is increased. In this connection this work presents the results of investigations of effect of the WTC （welding thermal cycles） on the nature of structural transformations, hardness, static strength and resistance to the formation of cold cracks in HAZ metal of high-strength carbon rail steel M76. For this purpose, the structure and kinetics of transformation of an overcooled austenite was studied using the advanced methods of physical materials science by the modeling of phase transformations in the Gleeble 3800 unit. It was found that the cause of reduction in mechanical properties of welded joints of steel M76 is the formation of regions with a completely martensite.structure in the amount of up to 5%. Results of investigations will be applied for the optimizing the technology and conditions of FBW of the advanced rail steels. 10 Ref., 4 Tables, 11 Figures.

关键词： High-strength carbon rail steel austenite decay ferrite bainite martensite.

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The Effects of Rolling Process on the Microstructure and Properties of Columnar-grained Cu-12 wt.%Al Alloys

The Effects of Rolling Process on the Microstructure and Pro...

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中国材料大会2012

作者： Jili Liu Haiyou Huang Xu Xu Jianxin Xie Laboratory for Advanced Materials Processing University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

ISBN: (纸本)9783037856093;3037856092

Cu-12 wt.%Al（Cu-12Al） alloy fabricated by continuous unidirectional solidification（CUS） process has high elasticity,high strength,high conductivity,high plasticity and other good comprehensive properties,which has a potential to develop into a high-performance elastic material as the alternative to beryllium ***,the room temperature tensile elongation of the columnar-grained structure（CGS） Cu-12Al alloy with high ＜001＞β orientation along the axial direction exceeded 20%,which is six times more than that of the ordinary polycrystalline structure（OPS） Cu-12Al alloy（ε=2-4%） fabricated by traditional *** CGS Cu-12Al alloy shows lower flow stress and work-hardening rate during plastic deformation,which determines a dramatic improvement of workability comparing with the OPS *** the present paper,both the effects of the rolling process and its parameters on the microstructure and properties of the CGS Cu-12Al alloy sheets were *** results showed that the CGS sheets（σb=310 MPa,ε=19%） have the maximum reduction of 80% and remain columnar-grained structure after the first rolling pass at 700℃.After deformation the tensile strength was 401 MPa and the tensile elongation approached to 14%.Then,the hot rolled sheets were rolled again through the second pass at 325℃ and 700℃,*** maximum reduction of CGS sheets at 325℃ warm rolling was 20%,the sheets remain columnar-grained structure and β1’→α1’ martensitic phase transformation occured;The second pass hot-rolling at 700℃ showed that the maximum reduction exceeded 60%,and the recrystallization occured in the *** two passes of hot-rolling（total deformation was 92%）,although the recrystallization occured,the CGS sheets remained columnar-grained structure（CGS） high tensile elongation（8.3%）,which is two times more than that of the as-cast OPS sheets,and is five times as much as the OPS sheets with the same total deformation.

关键词： columnar grain Cu-12wt.%Al alloy rolling recrystallization martensite.

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