共查询到17条相似文献,搜索用时 140 毫秒
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A508-3钢是目前世界上最常用的轻水堆核电站反应堆压力容器(RPV)材料。我国在20世纪就开始了对A508—3钢的开发。但目前国产A508—3钢的研制水平仍赶不上核电发展进程。因此,为进一步改进国产A508—3钢的性能,有必要对其进行一系列的力学测试,获得该材料的失效机理。 相似文献
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反应堆压力容器(RPV)作为反应堆寿期内不可更换的核心设备,是防止堆芯放射性泄漏的最主要屏障。本文针对国产压力容器材料A508-3钢,开展了一定剂量水平(约10×1019 cm-2,E≥1 MeV)的研究堆加速辐照试验,并进行了辐照后力学性能测试分析,包括拉伸性能和冲击性能测试。结果显示,辐照后在-100、20、288 ℃下,A508-3钢的屈服强度分别增加了83、108、52 MPa,抗拉强度分别增加了58、61、49 MPa,韧脆转变温度T41J增加了68 ℃,上平台能量降低了61 J。A508-3钢辐照前后性能测试结果表明,在中子辐照至60 a寿期后,A508-3钢仍能满足反应堆使用要求。 相似文献
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《中国原子能科学研究院年报》2019,(0)
<正>由于小冲杆试验样品较小,很难通过在热室中使用机械手操作完成试验。为了对放射性样品进行小冲杆试验,设计了1套针对放射性试样的小冲杆试验装置,以减少操作人员的受照剂量。试验装置示意图如图1所示。试验前,将顶丝旋紧固定住冲杆,将球漏斗置于下夹模上表面,用球勺(前段有φ1mm×1mm小孔)取出φ1mm陶瓷球并放入球漏斗中,陶瓷球即可落入下夹模 相似文献
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断裂韧性是用于表征反应堆压力容器(RPV)钢脆性状态的重要指标。在开展相关研究时,由于辐照空间小等原因,一般采用小尺寸紧凑拉伸(CT)试样。为掌握CT试样尺寸变化对国产RPV钢断裂韧性测试结果的影响,对国产A508-3钢的不同尺寸CT试样进行了测试分析,采用Beremin模型方法研究了尺寸效应对断裂韧性数据的影响,并建立了不同尺寸CT试样的断裂韧性数据归一化模型(TSM)。结果表明,同一温度下实验测得的断裂韧性值随试样尺寸的减小逐渐增大,不同样品通过标准方法得到的归一化数据存在偏差,本文建立的TSM可有效减小换算数据偏差。 相似文献
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Assessment of the constitutive properties from small ball punch test: experiment and modeling 总被引:1,自引:0,他引:1
An assessment of the true stress-true strain relationship has been done by means of tensile and small ball punch tests on austenitic and tempered martensitic steel at room temperature. A finite element model was developed and validated to calculate the force-deflection curve obtained from the ball punch experiment. The effects of the specimen thickness and material properties on the overall shape of the ball punch test curve are discussed. The constitutive behavior assigned to the specimen for the calculations was determined from the tensile test but we showed that assumptions have to be done to extend it to large strains as those arising during the punch tests. Using an inverse methodology, it was possible to show that a linear strain-hardening stage takes place at large strains. The potential for evaluating the evolution of the strain-hardening capacity after irradiation is outlined. 相似文献
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Kaishu Guan Li Hua Qiongqi Wang Xiaohui Zou Ming Song 《Nuclear Engineering and Design》2011,241(5):1407-1413
Small punch test (SPT) is a miniature sample test technique which can evaluate in-service material properties with an almost non-destructive method. In this paper, the 2.25Cr1Mo steel samples serviced for 10 years in hydrogenation reactor (with temper embrittlement), 1.25Cr0.5Mo supper-pressure vapor pipe serviced for 14 years at 520 °C and several other low alloy steels have been studied by JIC fracture toughness and SPT. The linear relationship between the small punch (SP) equivalent fracture strain and the fracture toughness of JIC was created. The correlations applied to the experimental data indicated advantages of using SPT for the determining fracture toughness of in-serviced low alloy steels. Additionally, size affects the fracture pattern. Small punch samples of small size show dimple fractures whereas large fracture toughness samples show quasi-cleavage fractures. 相似文献
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反应堆压力容器(RPV)是保障核电站运行安全性、经济性的核心构件。对RPV的完整性评估而言辐照脆化是必须面对的问题。我国已开发了第三代设计寿命为60 a的核电站。当达到寿期末时,辐照脆化的行为是未知的,这给国产RPV的辐照脆化预测带来了困难。为研究高注量下的辐照脆化行为,对A508-3钢的材料力学性能试样进行辐照考验,辐照温度为(288±8) ℃,中子注量水平达到反应堆压力容器60 a寿期末的辐照水平1×1020 cm-2;开展拉伸、冲击和断裂韧性试验,分析辐照脆化行为,在EONY模型基础上,提出针对国产RPV钢的改进的辐照脆化模型。模型的有效性被试验数据证实,其可准确预测国内A508-3材料的辐照脆化趋势。 相似文献
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In this work, the sensitivity of liquid metal embrittlement of the T91 martensitic steel is investigated with the small punch test (SPT). The material was studied in three tempering conditions (as quenched, tempered at 500 and 750 °C), at 300 °C in air and in the liquid lead bismuth eutectic (LBE). The load–displacement curves (four stages, low maximum force and large displacement to fracture) obtained for one test condition of the 750 °C tempered material is in general very different from those of the two other materials. An effect of LBE has been observed for the as quenched and 500 °C tempered steels. For these materials, the curves tend to be linear with a reduced displacement to fracture suggesting a brittle behavior. This ductile to brittle transition induced by liquid metal has been confirmed from the fracture surface analysis where cleavage was observed. In comparison with conventional tensile tests, small punch tests appear to be more sensitive to evidence liquid metal embrittlement. 相似文献