堆焊CAPP系统的研究与开发

本文在充分了解堆焊工艺的基础上，以Oracle数据库为堆焊数据库的支撑，在WindowsXP环境下，以VC＋＋研究开发集工艺数据的存储、查询和管理为一体的堆焊焊接CAPP系统，系统有很强的人机交互性，工艺人员能准确的制定堆焊工艺卡，提高了工艺设计效率。     

夏利轿车铜合金模具TIG堆焊工艺研究

介绍了新型焊接材料和ＴＩＧ堆焊的工艺性能特点，与传统手工电弧堆焊和氧乙炔焰堆焊比较，该工艺可使堆焊层的材质和机械性能达到原设计要求，成功地解决了铜合金模具堆焊的技术难题，获得了良好的效益。     

夏利轿车铜合金模具TIG堆焊工研究

介绍了新型焊接材料和ＴＩＧ堆焊的工艺性能特点，与传统手工电弧堆焊和氧乙炔焰堆焊比较，该工艺可使堆焊层的材质和机械性能达到原设计要求，成功地解决了铜合金模具堆焊的技术难题，获得了良好的效益。     

等离子粉末堆焊工艺研究现状与进展

等离子粉末堆焊是近年来在制造业中被广泛应用的一种快速涂层及修护制备技术，具有速度快、焊接质量好、堆焊层材料种类广、工艺变异性对性能影响小等优点，在工程机械、矿山开采、石油钻探、煤矿开采等耐磨抗腐蚀领域有着重要应用。本文系统综述了等离子粉末堆焊的原理、发展以及合金粉末、堆焊工艺对堆焊层组织性能影响的研究现状，指出了我国等离子堆焊技术目前存在堆焊粉末成分体系较少、相关工艺基础理论研究薄弱以及检测评价手段单一等问题和不足，提出了从体系和技术上创新材料设计思路、通过正交试验探究最佳工艺、开发新型堆焊工艺以及完善检测手段并形成系统堆焊评价体系的建议。     

15CrMoR薄壁封头堆焊工艺

对15Cr Mo R进行耐蚀堆焊工艺评定,确定了带极堆焊的焊接工艺。进行薄壁封头的堆焊工艺性试验,分析薄壁封头容易发生堆焊变形的情况,设计制作薄壁封头的堆焊工装。分析薄壁封头产生焊接变形原因,确定采取焊前预热、焊后加热缓冷等工艺手段。针对高温焊道找水平难的问题,设计制作了焊道找水平工具。结果表明,选择合理的堆焊工艺及堆焊工装,能够获得符合要求的薄壁堆焊封头。     

修边模具堆焊工艺的研究

修边模具堆焊工艺是以42CrMo为基体，通过在刃口部位堆焊高硬度合金钢制造修边模，代替传统的修边模制造工艺。分析了工艺参数对堆焊层金相组织、堆焊层硬度及耐磨性的影响，选取了适当的工艺参数并给出了堆焊法制造冷冲模的工艺要点。堆焊层金属及过渡区无气孔、裂纹等缺陷，堆焊的刃口平均硬度在57．5HRC以上．焊缝成形良好并具有很高的耐磨性能。并实际堆焊制造了修边模具，现场应用表明，堆焊层不脱落，寿命达到或超过传统工艺制造的修边模。该工艺对于修复其它冷作模具也具有很好的应用前景。     

碳化钨耐磨药芯焊丝电弧堆焊工艺与性能的研究

试验研究了碳化钨耐磨药芯焊丝电弧堆焊工艺方法对堆焊层性能和组织的影响。结果表明，堆焊工艺中的能量输入、堆焊层数以及冷却方式对堆焊层的硬度、耐磨性及堆焊层结合性能有明显的影响。导致堆焊层性能变化的主要原因是工艺因素引起了堆焊层组织及碳化钨形态的变化。其中堆焊工艺采用大电流、双道焊、缓慢的冷却速度时，堆焊层中的强化相碳化物颗粒较大，分布均匀，堆焊层具有良好的综合性能。     

厚壁压力容器不锈钢带极电渣堆焊与埋弧堆焊对比

本文在堆焊工艺，焊缝成形，母材稀释率，堆焊层性能和熔合特征等几个方面，对厚壁压力容器不锈钢带极电渣堆焊与带极埋弧堆焊进行了全面的对比研究。对比结果表明，带极电渣堆焊优于带极埋弧堆焊，可以用带极电渣焊工艺取代极埋弧堆焊工艺，来进行厚壁压力容器的内壁堆焊。     

灰口铸铁阀体密封面镍基堆焊技术

详细介绍了一种改善旋转止回阀密封面性能的镍基堆焊工艺。针对阀体密封面的结构,设计了特殊焊接工艺,精确地完成了堆焊过程,达到厂家设计要求。     

铬钼钢制加氢换热器,反应器耐蚀层堆焊质量分析

依据焊接试验与产品应用结果，从焊接试验与产品堆焊的全过程出发，论述了堆焊工艺应用范围、耐蚀层堆焊的技术要求、堆焊工艺参数的选择以及堆焊层的质量问题，重点分析失效现象及产生原因，并提出了防止措施。     

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.     

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。     

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.     

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.     

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.