共查询到19条相似文献,搜索用时 156 毫秒
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研究了不同正火温度、回火保温时间和冷却方式对低碳马氏体不锈钢ZG06Cr13Ni4Mo组织与力学性能的影响。利用光学金相显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)对材料的微观组织和结构进行了研究。进行了室温拉伸和0℃冲击试验,并用SEM观察了断口形貌。结果表明,正火温度对ZG06Cr13Ni4Mo不锈钢组织与性能有显著影响。在γ+δ两相区正火时,会生成高温δ铁素体,并且δ在随后的热处理中不能被消除,即使很少的铁素体(1%),也会极大损害材料的韧性。采用较快冷却时,材料的韧性较高而强度较低;较长时间的回火保温,材料的强度较低,与较短时间保温下相比韧性没有明显差别。 相似文献
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《Science & Technology of Welding & Joining》2013,18(2):152-160
AbstractThis paper presents a thermomechanical metallurgical macroscopic model for steels. The model is based on an existing model that is extended for non-isothermal behaviour in combination with phase transformations. The model and its numerical implementation in ABAQUS are described using vector notation for stress and strain tensors. Model parameters are presented for the dual phase steel DP600 and the structural steel S355. For DP600, thermomechanical model parameters, i.e. hardening and strain rate dependency, have been obtained by fitting temperature and strain rate dependent tensile tests. A metallurgical model was implemented using data obtained from phase field models for the austenite growth and continuous cooling transition diagrams for phase transformations from austenite to low temperature phases. The model is applied to welding simulations of DP600 overlap joints and S355 T joints. The final distortion is compared to experiments and it is shown that the model presented is able to reproduce the experimental results very well. 相似文献
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研究了淬火介质SST103对低铬半钢的硬度分布及淬裂敏感性的影响。结果表明,适合低铬半钢淬火介质SST103的浓度应在1.5%~2.0%之间,且介质温度低于40 ℃。 相似文献
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TEMPERINGRESPONSEOFADEFORMEDLOWCARBONDUALPHASESTRUCTURE¥JINMan;JIANGZhonghao;NANShenghui;HUJiandong;LIANjianshe(JilinUniversi... 相似文献
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JIANG Zhonghao GUAN Zhenzhong ZHANG ZuomeiChangchun Institute of Optics Fine Mechanics Chinese Academy of Sciences Changchun ChinaLIA N JiansheJilin University of Technology Changchun China 《金属学报(英文版)》1994,7(1):36-44
Based on the deformation model of dual phase steels,an expression for the stress of martensile in dual phase steels is derived,it predictes that the onset of plastic deformationof martensite (transition strain) depends on the strain hardening of ferrite and on thestrength of martensite.The relationship between the flow stress and microstructural parameters of a 0.12C-0.9Mn dual phase steel was investigated using the expression forthe flow stress of dual phase steel.By calculating the stress ratio and the stress-strainpartition coeffictient,the load transition and the stress-strain partition between two phases are studied.It shows that the deformation of dual phase steel lies between the isostress and isostrain states and the stress-strain pratition changes continuously during the deforamtion. 相似文献