共查询到18条相似文献,搜索用时 46 毫秒
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研究了不同热处理工艺后40Cr10Si2Mo气阀钢力学性能、调质硬度,以及在要求技术条件下的力学性能、调质硬度、金相组织与不同热处理温度之间的关系,找到了满足技术条件要求最佳的热处理工艺制度。 相似文献
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Q690高强钢板可采用低碳成分设计和“在线淬火+回火”工艺实现批量生产.针对不同韧性要求,选择了Q690D钢加Cr和Q690E钢加Ni两种合金成分设计方案,并对两种成分设计情况下的变形抗力进行研究以及对比分析.发现加Cr钢的变形抗力随温度变化比加Ni钢更明显.在700~750℃温度范围内,变形抗力下降较快,超过750℃时,变形抗力的下降速度明显减慢.变形程度小于0.4时,变形抗力随变形量的增加而快速上升;变形程度大于0.4时,变形抗力增加逐步平缓. 相似文献
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以屈服强度960MPa级高强调质钢板开发为目标,研究了淬火热处理制度对试验钢显微结构及力学性能的影响.结果表明:再加热淬火温度及保温时间决定了合金元素的溶解分布状态以及原奥氏体晶粒尺寸,最终影响了试验钢的综合力学性能,当淬火温度为900℃,保温15~25 min左右时试验钢具有优良的性能,即屈服强度Rp0.2=1110 MPa,抗拉强度Rm=1 140 MPa,伸长率A=14%,-40℃冲击功Akv=130J,各项指标均满足国标GB/T16270-2009的要求. 相似文献
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Hector Pous-Romero Harry K. D. H. Bhadeshia 《Metallurgical and Materials Transactions A》2014,45(11):4897-4906
A class of low-alloy steels often referred to as SA508 represent key materials for the manufacture of nuclear reactor pressure vessels. The alloys have good properties, but the scatter in properties is of prime interest in safe design. Such scatter can arise from microstructural variations but most studies conclude that large components made from such steels are, following heat treatment, fully bainitic. In the present work, we demonstrate with the help of a variety of experimental techniques that the microstructures of three SA508 Gr.3 alloys are far from homogeneous when considered in the context of the cooling rates encountered in practice. In particular, allotriomorphic ferrite that is expected to lead to a deterioration in toughness, is found in the microstructure for realistic combinations of austenite grain size and the cooling rate combination. Parameters are established to identify the domains in which SA508 Gr.3 steels transform only into the fine bainitic microstructures. 相似文献
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压力容器用18MnMoNbR钢板的性能研究 总被引:1,自引:0,他引:1
本文结合生产实际情况,分析了影响18MnMoNbR钢板机械性能的工艺参数,又在实验室作了试验,最后选择出合理的工艺制度。 相似文献
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通过对核安全二、三级压力容器用15MnNi钢板的成分、生产工艺、力学性能及金相组织进行分析,研究了工艺参数对力学性能、金相组织的影响,成功开发出实物质量优良的15MnNi钢板. 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):412-416
The effect of post weld heat treatment (PWHT) on the toughness of nuclear reactor pressure vessel steel was investigated.Fracture toughness (K JC) and Charpy impact toughness (KVC) were obtained at different temperatures for quenched-tempered (QT) and PWHT A533B steel plates,respectively.The results show that PWHT increases the ductile-brittle transition temperature,and decreases the K JC and KVC.By using SEM and Electron probe micro-analyzer (EPMA),it is found that the size of the precipitation phases increased and molybdenum precipitated during PWHT respectively.The relationship between the size of the precipitation phases and the fracture toughness are analyzed and the influence of microstructure is also briefly discussed. 相似文献
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论述了Q370R压力容器板的生产工艺,研究了不同的热处理工艺对Q370R压力容器板性能的影响。 相似文献