铸锻件磁粉与渗透检测工艺的选择

对磁粉检测和渗透检测工艺进行比较,并结合实践经验,提出了铸锻件进行磁粉检测或渗透检测的选择原则,例如,要检测铸件的缩松缺陷渗透检测比磁粉检测好,铸件多选用渗透检测。     

球墨铸铁件无损检测综合评价方法

介绍了无损检测技术用于球墨铸铁质量检测的基本原理及应用状况。液体渗透检测、涡流检测和磁粉检测常用于检测铸件表面和近表面缺陷,射线检测和超声检测常用于检测铸件内部缺陷,超声检测可用于表面光洁铸件的球化质量的检测,振动检测则用于表面粗糙铸件的球化质量的检测。     

中航试金石检测科技有限公司

<正>中航试金石检测科技有限公司(以下简称检测公司)是中航工业北京航空材料研究院与淄博三林新型材料有限公司共同建立的为公众服务的检测公司。检测公司专门从事金属、非金属材料的分析检测,检测技术推广,检测设备研发以及检测技术培训等业务。检测公司占地面积约30000平方米,仪器设备固定资产约9000万元,检测设备先进,检测技术完备,具有高水平的材料性能检测、综合评定能力和完善的管理体系,致力于成为国内领先、国际先进的综合性大型检测基地。     

EEC-2008net电磁/超声网络智能检测系统的研制

随着工业检测技术的发展,功能单一的无损检测设备已不能满足现场检测的要求。结合多种无损检测方法,提供更多更全面的信息已成为无损检测发展的重要方向之一。EEC-2008net检测系统将涡流、超声和磁记忆检测技术集成于同一台仪器中。该系统在实际检测中可以降低缺陷的误检与漏检,而且不同的检测方法之间切换快捷,节省了人力与物力,大大提高了现场检测效率。该设备还可以与计算机网络技术相结合,基于以太网结构拓展成检测网络,实现多通道检测与检测数据的多方共享。     

图书推荐

无损检测技术问答编著：王海波、邵泽波定价：39.0元出版日期：2014年11月开本：大32开页数：309页该书以问答的形式系统介绍了渗透检测、磁粉检测、射线检测、超声波检测、涡流检测、声发射检测、光全息检测、红外热成像检测、微波检测、高温应变测试等无损检测技术,反映了无损检测领域的新技术和新方法,同时列举了生产实践中的许多应用实例,对比了各种无损检测方法的特点和适用范围,     

第十专题 用于金属材料性能无损检测的涡流检测探头

目前,很多金属管棒材和各类金属零部件的生产制造厂,主要用无损检测的方法来控制其成品和半成品的质量。其中,涡流检测的方法,由于其具有自动化程度高、检测速度快等优点而得到广泛应用。涡流检测装置在控制金属材料和金属零部件的成品或半成品的质量方面大致可分为两类,一类是金属材料的缺陷检测装置,另一类是金属部件的性能检验装置。在电子产品高速发展的今天,各类进口和国产涡流检测仪器的性能也得到不断提高,有的涡流检测仪器已达到了既可检测金属材料缺陷,又可检测金属零部件性能的智能化仪器,如:西德Foerster公司的Eddy Current Module(简称ECM)系列,就属此类的智能化涡流检测仪器。涡流检测装置除了须有先进可靠的涡流检测仪器来保证检测结果的可靠性外,探头也是其中十分重要的部分。其性能的好坏不仅决定了检测的灵敏度,也影响整个自动化检测设备的运行。本文将介绍一系列应用于不同生产条件和检测需求的涡流检测探头。 1 涡流检测探头检测信号的产生     

特高压输电线路钢管塔薄壁管对接环焊缝超声波检验方法研究

分析了薄壁管对接焊缝超声波检测的特点,讨论了爬波检测的可行性,设计了爬波检测专用探头和对比试块,用爬波方法进行检测,并与射线检测结果进行了对比分析,结果表明,超声爬波检测是一种新型高效率的检测方法,可以用于薄壁管对接焊缝的超声波检测。     

基于最大熵谱估计的管道腐蚀超声内检测系统

超声检测是管道腐蚀缺陷在线检测的重要方法之一,短时间序列、高分辨、强抗干扰能力的在线功率谱估计算法是管道内检测的关键技术.基于在线最大熵谱估计,研制了具有20个探头的多通道超声管道内检测系统.检测系统采用主从结构,检测板卡通过PCI总线与嵌入式计算机通信,高速切换开关扩展检测通道数,超声回波信号在线处理采用Burg最大熵谱估计法.经标准实验管段检测证明,该检测系统能够检测管道内外腐蚀缺陷,适用于管道腐蚀在线检测,应用前景较好.     

基于计算机图形技术的螺旋弹簧应力检测装置

为弥补传统检测方法在螺旋弹簧应力检测方面的不足,基于计算机图形技术,研制了一款螺旋弹簧应力检测装置,详细阐述了该新型检测装置的检测原理,对比分析了检测装置的数据与计算模拟仿真数据以及应变片测试数据,确定该装置检测数据的最大误差小于5%。新型检测装置具有操作简便、检测精度高与可实时检测等优点,在螺旋弹簧应力检测领域有广阔的应用前景。     

阵列涡流成像技术数值仿真及应用

阵列涡流检测技术可以根据工件外形来设计探头,检测方式灵活多变,并能将检测结果成像显示,成为了涡流检测的发展趋势。数值仿真方法可以对实际检测情形进行模拟,辅助检测工艺的制定,提高检测的准确性。     

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.     

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。     

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.     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

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.     

Structural Optimization of Electromagnetic Swirling Flow in Nozzle of Slab Continuous Casting

During the slab continuous casting process, the flow field of molten steel in the mold plays a decisive role in the quality of the slab. In this paper, electromagnetic swirling flow in nozzle technology is proposed to control the flow field in mold.This technology can drive molten steel to rotate inside the submerged entry nozzle by electromagnetic force, thereby controlling the flow field. This research shows that it can reduce the impact of molten steel on the bottom of nozzle and partly reduce the negative pressure at the upper part of nozzle outlet which is even eliminated by optimizing the structure and angle of nozzle. The area of heat flux of the mold wall becomes larger, and the crest value of heat flux gets lower than that without swirling in nozzle and any nozzle optimization. The meniscus fluctuates smoothly, and the flow velocity at the top surface is within a reasonable range. The temperature field distribution in the mold is uniform which was beneficial to the growth of equiaxed crystal and decreased element segregation.