回火温度对SA533B钢组织和力学性能的影响

通过光学显微镜和透射电镜，研究了不同回火温度对SA533B钢力学性能、组织及析出行为的影响。结果表明，SA533B钢经880~C淬火和680~C回火后综合力学性能最佳，屈服强度、抗拉强度和延伸率分别为635MPa、750MPa和21％，冲击功120J。

核电站安注箱用复合板基板SA533BCl.1的研制

根据核电站安注箱复合板设计规范要求,太钢自主研发出调质型安注箱用复合板基板SA533BCl.1。钢板具有性能一致性好、厚度方向性能差异较小的特点,其中钢板头部和尾部、表层和心部强度波动均在25 MPa以内,冲击功在200 J以上。各项性能指标完全满足安注箱复合板基板设计要求。

核电设备用SA533B钢板的组织和性能

对核电设备用SA533B钢板的显微组织、拉伸性能、冲击性能以及中温疲劳性能进行了分析。结果表明:SA533B钢板的显微组织为晶粒均匀细小的粒状贝氏体,为正常的调质组织;该钢板的综合力学性能优良,同时具有高的强度、塑性、冲击韧度及疲劳性能,满足核级安全性能的要求。

The effect of different cooling and tempering conditions on the strength and toughness of SA533B steel

The microstmcture and mechanical properties of SA533B low-alloy steel were investigated under different cooling and tempering conditions. Steel plates cooled at 40℃/s and 25℃/min,exibited microstructures of auto-tempered martensite and bainite, respectively. During tempering, the strength of steels quenched at the two different cooling rates decreased continuously with an increase in the tempering parameter, which is defined by T （20 ＋ log t）, where T is the temperature and t is the holding time. However, the rate of change of the strength scales with the degree to which the virgin microstructure deviates from equilibrium. The strength of the martensitic steel decreased faster and finally obtained a value close to that of the bainitic steel. The ductility and toughness gradually improved during tempering, passed through a maximum value, and finally diminished. The level of maximum toughness was also found to depend on the cooling rates of SA533B steel. The high cooling rate with a microstructure of auto-tempered martensite exhibited a larger toughness and a lower ductile-brittle transition temperature than the low cooling rate with a microstructure of bainite, because the former had finer precipitated cementite particles at quenching and a slower coarsing rate during tempering.

高温回火对SA533B钢力学性能及微观组织的影响

为研究高温回火对SA533B(0.15C-1.39Mn-0.28Si-0.50Mo-0.59Ni-Fe,wt%)钢力学性能及微观组织的影响,采用拉伸试验、夏比V型缺口冲击试验检验了钢板在660~720℃回火60 min后的力学性能,膨胀试验测定相变点,用SEM、TEM表征了不同状态下的微观组织。结果表明:SA533B钢的Ac_1、Ac_3、Ms、Mf点分别为630、816、446和280℃,在910℃水淬后的组织为板条马氏体。回火温度范围可以选择在660~710℃。当回火温度低于710℃时,由于组织仍然保持着铁素体板条形貌,并且板条总体的尺寸较小,整体强度与韧性仍然匹配较好。当回火温度高于710℃时,回火过程中形成大量富碳奥氏体,冷却过程中可转变为孪晶马氏体,强度显著提高,韧性剧烈降低。

核电压力容器用钢SA533B的变形抗力及其数学模型

用Gleeble-3500热模拟试验机对SA533B核电压力容器用钢进行热压缩试验,研究不同热变形条件下SA533B钢的高温变形抗力,分析了变形温度、变形速率及变形量与变形抗力之间的关系,利用回归分析确立合适的变形抗力数学模型。结果表明,变形温度对变形抗力影响较大,变形速率较低时变形抗力变化较大,变形量对变形抗力的影响主要在变形初期。变形抗力数学模型为:σ=4311.322584×ε0.098ε0.0874exp(-0.0034T+0.2813ε)。

反应堆压力容器钢SA533B的修正θ-projection蠕变模型研究

反应堆严重事故下,压力容器存在因冷却不充分而蠕变失效的风险。基于修正θ-projection蠕变模型提出了一种针对反应堆压力容器钢SA533B的蠕变模型,该模型能够完整描述3段蠕变过程,模拟结果与实验结果蠕变曲线符合较好,同时可通过插值方法预测任意载荷下的蠕变行为。该模型可进一步用于压力容器失效的相关算例分析。