The dependences of radiation induced defects on irradiation temperature up to 700℃ at 15 dpa and on irradiation dose up to 85 dpa at room temperature have been investigated by the heavy ion irradiation and the positr...The dependences of radiation induced defects on irradiation temperature up to 700℃ at 15 dpa and on irradiation dose up to 85 dpa at room temperature have been investigated by the heavy ion irradiation and the positron annihilation lifetime spectroscopy for the CLAM. A void size peak is observed at -500℃ where the vacancy cluster contains 9 vacancies and has an average diameter of 0.59 nm. The size of the vacancy clusters increases with the increase of irradiation dose at room temperature, and the vacancy cluster at 85 dpa consists of 9 vacancies and reaches a size of 0.60 nm in diameter. The absolute values of the void size at the peak and the increase of void size with dose in the CLAM steel are negligible compared to those of the normal stainless steels, indicating that the CLAM steel has good radiation resistant property.展开更多
Thermo-mechanical simulations of single butt welding were performed ,for CLAM steel, utilizing commercial software, ANSYS, in which double ellipsoid heat source model was introduced and phase transition action was pre...Thermo-mechanical simulations of single butt welding were performed ,for CLAM steel, utilizing commercial software, ANSYS, in which double ellipsoid heat source model was introduced and phase transition action was precluded. The residual stress distributions based on the calculated temperature field were calculated and ahnost coincided with those from the experimental results. Based on the simulation, it was also found that tensile stress exists in the partial melting region and bond area; whilst compressive stress turns on away from weld zone. The residual stress over the cross section is very little and it is also confirmed to be tensile stress.展开更多
Using double eUipsoid heat source as inner heat source, a model of T-joint weldment of CLAW steel was established in order to analysis the temperature field, residual stress distribution and the angular deformation. A...Using double eUipsoid heat source as inner heat source, a model of T-joint weldment of CLAW steel was established in order to analysis the temperature field, residual stress distribution and the angular deformation. And the temperature- dependent properties of material were considered in this model. The results show that the temperature distribution changes with the movement of heat source, every node goes through two thermal cycles. And every curve has two peak values ; the first peak value is higher than the second one. The largest deformation appears at the weld toe.展开更多
The China low-activation martensitic(CLAM)steel has been proposed as a candidate structural material for nuclear fusion reactors.It is essential to study the influence of hydrogen charging and strain rate on the tensi...The China low-activation martensitic(CLAM)steel has been proposed as a candidate structural material for nuclear fusion reactors.It is essential to study the influence of hydrogen charging and strain rate on the tensile behavior of CLAM steel considering its service environment.In this study,CLAM steel was investigated using tensile tests operated at room temperature before and after hydrogen charging.The results showed that the elongation loss increased significantly with the increase of the hydrogen charging current density at either a low or a high strain rate,which is related to the hydrogen content in the steel.The hydride was systematically studied,including the morphology and the thermal stability as well as the effects on mechanical properties.The possible mechanism of the formation of hydride during hydrogen charging has been analyzed based on the interaction between alloying elements and hydrogen.展开更多
The cavitation erosion of weld joint and base metal of China low activation martensitic（CLAM）steel in liquid lead-bismuth eutectic alloy（LBE）at 550°C was investigated to simulate the cavitation erosion of the...The cavitation erosion of weld joint and base metal of China low activation martensitic（CLAM）steel in liquid lead-bismuth eutectic alloy（LBE）at 550°C was investigated to simulate the cavitation erosion of the first wall and the nuclear main pump impeller in the accelerator driven sub-critical system（ADS）.A suit of ultrasonic cavitation facility was self-designed to study the cavitation erosion.By studying the surface micro topography,roughness and mean pit depth of the tested specimens,it was found that some crater clusters and large scale cracks appeared on the tested specimen surface after the formation of numerous single craters,and the base metal exhibited much better cavitation erosion resistance than the weld bead due to the difference in their mechanical properties and microstructures.In addition,by comparing the results of static corrosion and cavitation erosion,it could be concluded that the cavitation erosion and the dissolution and oxidation corrosion in liquid LBE would accelerate mutually.展开更多
液态金属锂铅包层是最具发展潜力的聚变堆包层之一,其首选结构材料为低活化铁素体/马氏体钢,而它与液态锂铅的相容性是聚变堆材料研究领域的关键问题之一。本文介绍中国低活化马氏体钢CLAM在液态金属锂铅回路DRAGON-1热对流工况下的实...液态金属锂铅包层是最具发展潜力的聚变堆包层之一,其首选结构材料为低活化铁素体/马氏体钢,而它与液态锂铅的相容性是聚变堆材料研究领域的关键问题之一。本文介绍中国低活化马氏体钢CLAM在液态金属锂铅回路DRAGON-1热对流工况下的实验情况及500 h 480℃下初步腐蚀实验结果,并与同样工况下316L奥氏体钢腐蚀结果进行了对比分析。结果显示CLAM钢与液态锂铅的相容性优于316L钢。展开更多
基金supported by the State Major Basic Research Development Program in China(No.2009GB109000)National Science Foundation of China(No.11005158)
文摘The dependences of radiation induced defects on irradiation temperature up to 700℃ at 15 dpa and on irradiation dose up to 85 dpa at room temperature have been investigated by the heavy ion irradiation and the positron annihilation lifetime spectroscopy for the CLAM. A void size peak is observed at -500℃ where the vacancy cluster contains 9 vacancies and has an average diameter of 0.59 nm. The size of the vacancy clusters increases with the increase of irradiation dose at room temperature, and the vacancy cluster at 85 dpa consists of 9 vacancies and reaches a size of 0.60 nm in diameter. The absolute values of the void size at the peak and the increase of void size with dose in the CLAM steel are negligible compared to those of the normal stainless steels, indicating that the CLAM steel has good radiation resistant property.
文摘Thermo-mechanical simulations of single butt welding were performed ,for CLAM steel, utilizing commercial software, ANSYS, in which double ellipsoid heat source model was introduced and phase transition action was precluded. The residual stress distributions based on the calculated temperature field were calculated and ahnost coincided with those from the experimental results. Based on the simulation, it was also found that tensile stress exists in the partial melting region and bond area; whilst compressive stress turns on away from weld zone. The residual stress over the cross section is very little and it is also confirmed to be tensile stress.
文摘Using double eUipsoid heat source as inner heat source, a model of T-joint weldment of CLAW steel was established in order to analysis the temperature field, residual stress distribution and the angular deformation. And the temperature- dependent properties of material were considered in this model. The results show that the temperature distribution changes with the movement of heat source, every node goes through two thermal cycles. And every curve has two peak values ; the first peak value is higher than the second one. The largest deformation appears at the weld toe.
文摘The China low-activation martensitic(CLAM)steel has been proposed as a candidate structural material for nuclear fusion reactors.It is essential to study the influence of hydrogen charging and strain rate on the tensile behavior of CLAM steel considering its service environment.In this study,CLAM steel was investigated using tensile tests operated at room temperature before and after hydrogen charging.The results showed that the elongation loss increased significantly with the increase of the hydrogen charging current density at either a low or a high strain rate,which is related to the hydrogen content in the steel.The hydride was systematically studied,including the morphology and the thermal stability as well as the effects on mechanical properties.The possible mechanism of the formation of hydride during hydrogen charging has been analyzed based on the interaction between alloying elements and hydrogen.
基金supported by the National Natural Science Foundation of China with Grant Nos.51375216 and 51505197the Open-Fund Research of State Key Lab of Advanced Welding and Joining with Grant No.AWJ-16-M07the Fusion Digital Simulation(FDS)Team for support the CLAM steel
文摘The cavitation erosion of weld joint and base metal of China low activation martensitic（CLAM）steel in liquid lead-bismuth eutectic alloy（LBE）at 550°C was investigated to simulate the cavitation erosion of the first wall and the nuclear main pump impeller in the accelerator driven sub-critical system（ADS）.A suit of ultrasonic cavitation facility was self-designed to study the cavitation erosion.By studying the surface micro topography,roughness and mean pit depth of the tested specimens,it was found that some crater clusters and large scale cracks appeared on the tested specimen surface after the formation of numerous single craters,and the base metal exhibited much better cavitation erosion resistance than the weld bead due to the difference in their mechanical properties and microstructures.In addition,by comparing the results of static corrosion and cavitation erosion,it could be concluded that the cavitation erosion and the dissolution and oxidation corrosion in liquid LBE would accelerate mutually.
文摘液态金属锂铅包层是最具发展潜力的聚变堆包层之一,其首选结构材料为低活化铁素体/马氏体钢,而它与液态锂铅的相容性是聚变堆材料研究领域的关键问题之一。本文介绍中国低活化马氏体钢CLAM在液态金属锂铅回路DRAGON-1热对流工况下的实验情况及500 h 480℃下初步腐蚀实验结果,并与同样工况下316L奥氏体钢腐蚀结果进行了对比分析。结果显示CLAM钢与液态锂铅的相容性优于316L钢。
