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2014中国功能材料科技与产业高层论坛

作者： ZHIGANGWang MIN Jing KEGAO Liu Xu Yong School of Materials Science and Engineering Shandong Jianzhu University

By controlling the cooling,mean temperature adjustment and isothermal cooling process,bainite and martensite can be produced in the surface and the core of the ductile iron gear using the 75℃hot water as the quenching *** it has a high hardness value in the point and the pitch circle,a low hardness value in the root and the core,this ductile iron can be applied to the actual production of the *** gear surface organization will be affected by quenching cooling *** appearance of the temper phenomenon can result in the decrease of hardness value in the surface of the gear when the cooling timeis short..However,the content of the lower bainite can be increased by extending the cooling time properly in the surface of the *** influence of the quenching cooling time on the core organization of the gear is small.

关键词： Ductile gear control cooling Bainite

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Influence of Microstructures on Polarization Resistance and Hydrogen-Induced Cracking of a Micro-Alloyed Steel Submitted to Different cooling Rates

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Journal of Iron and Steel Research International 2011年第S1期18卷 168-172页

作者： González M R Martins de Araújo D S Goldenstein H Alonso-Falleiros N Departamento de Engenharia Metalúrgica e de Materiais EscolaPolitécnicaUniversidade de Sao Paulo-SP-Brasil

The effect of different microstructures on the polarization resistance (Rp) and the hydrogen-induced cracking (HIC) of a micro-alloyed steel austenitized and submitted to different cooling rates was *** 19.1 x 6 x 2 mm,containing the whole thickness of the plate were extracted from a 20 mm plate and heat treated on a quenching dilatometer,were submitted to Rp and HIC corrosion *** Rp and HIC tests followed as close as possible ASTM G59 and NACE standard TM0284-2003,in this case,modified only with regard to the size of the *** samples transformed from austenite by a slow cooling (cooling rate of 0.5℃.s-1) showed higher susceptibility to hydrogen-induced cracking,with large cracks in the middle of the sample propagating along segregation bands,corresponding to the centerline of the plate *** cooling rates of 10℃.s-1,only small cracks were found in the matrix and micro cracks nucleated at non-metallic *** higher cooling rates (40℃.s-1) very few small cracks were detected,linked to non-metallic *** result suggests that structures formed by polygonal structures and segregation bands (were eutectoid microconstituents predominate) have higher susceptibility to *** predominantly formed by acicular ferrite make it difficult to propagate the cracks among non-oriented and interlaced acicular ferrite *** segregation bands containing eutectoid products also help inhibit cracking and crack propagation;segregation bands can function as pipelines for hydrogen diffusion and offer a path of stress concentration for the propagation of cracks,frequently associated to non-metallic *** resistance essays performed on the steel in theas received condition,prior to any heat treatment,showed larger differences between the regions of the plate,with a considerably lower Rp in the *** austenitization heat treatments followed by cooling rates of 0.5 e 10℃.s-1 made more uniform the

关键词： hydrogen induced cracking polarization resistance micro-alloyed steel control cooling

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