海阳AP1000核电站主管道加T技术

AP1000反应堆冷却剂系统主管道作为唯一没有引进国外技术的AP1000核Ⅰ级设备,由国产化整体锻造和弯制而成.由于制造难度大且无经验可借鉴,海阳项目主管道制造成型差,尤其是冷段壁厚与内径偏差较多,坡口加工的难度更大.研究主管道安装中的坡口加工,通过激光跟踪测量及3D建模技术的应用,采用偏心加工、斜面加工等方法,管控加工过程的质量风险,加工结果超出设计变更预期,为后续项目的主管道坡口加工提供了参考.     

海阳AP1000核电站主管道加工技术

AP1000反应堆冷却剂系统主管道作为唯一没有引进国外技术的AP1000核Ⅰ级设备,由国产化整体锻造和弯制而成。由于制造难度大且无经验可借鉴,海阳项目主管道制造成型差,尤其是冷段壁厚与内径偏差较多,坡口加工的难度更大。研究主管道安装中的坡口加工,通过激光跟踪测量及3D建模技术的应用,采用偏心加工、斜面加工等方法,管控加工过程的质量风险,加工结果超出设计变更预期,为后续项目的主管道坡口加工提供了参考。     

AP1000核电机组主管道焊接技术研究

文章通过对AP1000与M310核电机组主管道进行对比分析,总结了AP1000主管道焊接方面的特点和难点,同时文章还详细介绍了AP1000主管道焊接过程中采用的新技术、焊接工序以及焊接检验标准,为后续AP1000核电机组主管道焊接施工提供技术参考和经验借鉴。     

我国三家制造厂商已具备AP1000主管道制造能力

2010年5月24日,在国家核电技术公司（简称“国家核电”）组织召开的质量鉴定评审会上,评审组一致认为：吉林中意核管道制造有限公司研制的AP1000主管道热段模拟件满足技术规格书的要求,有能力承担AP1000核电站成套主管道设备的制造。此举,标志着我国已有三家制造厂商具备AP1000核电机组主管道制造能力。     

核电主管道制造工艺发展

核电主管道是核岛中关键部件之一。美国西屋公司推出的第3代核电技术AP1000要求核电主管道的使用寿命达到60年,且要求管身不能出现焊缝,因此对传统的核电主管道制造方法提出了挑战。目前国内制造AP1000核电主管道的方法是采用实心铸坯,用自由锻方法成形带有互成角度的接管嘴凸台实心轴坯,再通过机加工成形主管道的内孔。该机加工方法存在材料利用率低、生产工期长以及质量不稳定等特点。本文针对核电主管道成形工艺的发展进行分析,提出了一种基于镦挤工艺的第3代核电主管道成形方法。数值模拟分析结果表明,与目前采用的主管道成形方法相比,该方法具有节省材料、生产效率高及管道质量好等优点。     

大型核电主管道制造技术的发展

美国西屋公司AP1000技术是我国引进的第三代核电技术,由于其设计寿命提高到60年,其主管道制造采用整体锻造技术.接管嘴要求与主管一体锻造而成,而且整根管道(包括弯管部分)不允许有环焊缝,属于典型的形状复杂的异形件锻造,制造难度大.本文阐述了主管道材料和成形制造技术的发展情况,根据AP1000核电主管道整体锻造的要求,...     

AP1000核电站主管道国产化研制进展

阐述了AP1000核电站用主管道的技术要求和特点,介绍AP1000主管道模拟件国产化研制的主要技术思路及进展,通过联合技术攻关我国企业已经掌握了AP1000整体锻造主管道技术,并成功制造了满足西屋电气工程公司技术规范的AP1000主管道,实现了国产化。     

AP1000锻造主管道制造技术进展

阐述了AP1000主管道的技术要求和特点,介绍了AP1000主管道的制造技术思路及进展。     

三代核电站EPR与AP1000主管道安装及焊接差异分析

EPR与AP1000主管道焊接均采用窄间隙自动焊的方法进行焊接,文章对EPR与AP1000核电站主管道安装技术要求、施工逻辑顺序及焊接过程进行了详细的对比分析,阐明了二者的异同,为三代核电站主管道的安装及焊接提供了重要的参考。     

会员之窗

<正>中国二重举行AP1000核电主管道发运仪式(2012-03-16)2012年3月16日,中国二重举行了AP1000核电主管道发运仪式。中国二重承制的山东核电有限公司AP1000核电主管道的所有制造工序已完成,完全满足AP1000设计规格     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.