纯镍焊芯材料性能研究

纯镍焊芯材料具有强度高,特别是高温强度较高,而且耐腐蚀和高温抗氧化性能优良,适宜制造特殊用途的焊条。在试验基础上研制了纯镍焊芯材料,其性能达到国外同类产品的水平,满足了国内对焊芯材料的需要。     

光伏产业多晶硅设备配套焊材E2133Mn性能研究

N08810合金为多晶硅设备主要用母材,研制了与其匹配的焊材——E2133Mn焊条,并对其熔敷金属进行室温拉伸、600℃高温拉伸、G28-A法腐蚀等试验,证明了熔敷金属具有优良的机械性能及耐腐蚀性能。为验证E2133Mn焊条与母材的匹配性,采用该焊条进行N08810钢对接焊,并对其接头性能进行深度试验。经X射线探伤和面弯试验,表明接头未产生焊接缺陷,具有良好韧性。E2133Mn所有接头拉伸试验断裂位置均为母材,X型坡口上中下三层强度数据无明显区别,焊态强度达到560 MPa,经稳定化处理后强度提升到620 MPa,高温拉伸强度虽有明显下降,但优于母材,同样满足设计要求。试验结果表明,E2133Mn焊条与N08810钢匹配性优秀,焊缝及热影响区室温及高温强度全面优于母材,接头性能完全符合实际工程需求,为多晶硅设备装配制造提供了理论参考。     

9%Cr马氏体耐热钢C9MVW和5Co1焊条的研制

9%Cr马氏体耐热钢由于其优异的抗蠕变断裂性能,大量应用于火力发电汽轮机、锅炉及管道等设备的关键部位。C9MVW焊条及5Co1焊条是为匹配不同成分的母材,在9%Cr钢成分基础上分别添加适量的钨(W)元素及钴(Co)元素,以提高材料的抗高温蠕变性能及高温耐磨性能。两种焊条在全位置焊接时都具有良好的焊接性,且化学成分、力学性能及扩散氢含量均满足指标设计要求,高温持久强度经过专业机构测定均满足应用要求。     

高性能耐火耐候焊接材料的研制及应用

详细介绍了高性能耐火耐候建筑用钢WGJ510C2钢、配套焊条CJ556N和埋弧焊丝CJ.GNH-1/CHF101熔敷金属的化学成分和性能要求。通过分析焊接接头的力学性能和金相组织,进行冲击试验、硬度试验、高温拉伸试验和电化学腐蚀试验,结果表明,所配焊条CJ556N、埋弧焊丝CJ.GNH-1焊接性能良好,接头强度均高于母材,冷弯性能、低温韧性和高温性能优良,满足匹配技术条件。     

抗高温氧化腐蚀专用焊条

通过A402，A302，A202及Cr24Ni7不锈钢焊条熔敷金属的抗高温氧化腐蚀性能对比试验分析，设计了新的专用焊条合金系统Cr26Nil6，并在焊条药皮中分别添加微量稀土氧化物La2O3及CeO2，研究不同稀土氧化物添加量对焊条熔敷金属在空气中和含硫气氛中抗高温氧化及腐蚀性能的影响，从而确定了合理的稀土氧化物加入量。最后，对合金系统为Cr26Nil6的专用焊条进行工艺评价。结果表明，专用焊条工艺性好，用该焊条所焊焊缝的性能可满足抗高温氧化腐蚀使用要求。微量稀土氧化物在焊条药皮中的加入，对其熔敷金属的抗高温氧化性能有所提高，对在含硫气氛中的抗高温腐蚀性能有显著提高；加入La2O3的焊条熔敷金属比加入CeO2的焊条熔敷金属抗高温氧化及硫化腐蚀性能更好。     

奥氏体耐热不锈钢S30815的焊接工艺研究

S30815钢是具有优异的高温抗氧化性、高温强度及高温耐腐蚀性的奥氏体耐热不锈钢。通过分析其化学成分和组织,发现其焊接性能较好,热裂纹敏感性不大。选择国产CHS102Si N焊条进行焊接工艺试验,所获得接头的力学性能符合技术要求,证明其焊接工艺是可行的。     

镍基焊条JWENiCrMo-3的研制

研发了一种适用于镍基合金焊接的镍基焊条。选用CaO-CaF_2-TiO_2渣系作为焊条药皮的矿物粉体系,探究了药皮各矿物粉组成对焊条焊接性能的影响,评定了焊条熔敷金属力学性能、抗裂性能、抗高温氧化性能,并与市售焊条进行了综合对比。结果表明,该焊条施焊时,飞溅小、易脱渣、焊缝纹路均匀,抗热裂纹性能佳,熔敷金属综合性能优良。     

Cr-Mo系低合金钢焊条

1发明概述 提供一种满足9％Cr低合金钢焊接时具有高温强度和良好韧性熔敷金属的焊条。     

镍基高温耐磨无渣堆焊焊条及其热处理工艺

针对镍基合金具有优良的高温综合性能,且目前市场上几乎没有这类手工电弧堆焊材料等实际情况,研制开发了一种抗高温耐磨损的镍基无渣堆焊焊条.该焊条具有焊接烟尘小,烟尘中含对人体有害气体极少;焊后焊道上几乎没有熔渣,连续多层焊无需敲渣;价格便宜(与钴基合金相比),高温(650℃左右)性能优良等特点.此外,该焊条由于熔敷金属中含合金元素量较一般堆焊焊条的熔敷金属多,成分复杂,焊后焊缝中存在的内应力较大,且焊缝在快速冷却条件下产生的组织不稳定,从而影响到熔敷金属的综合性能.为了能更好地推广和更合理地应用这种高温无渣耐磨堆焊焊条,对其熔敷金属的热处理工艺也进行了初步探讨.     

高温耐磨无渣堆焊焊条的研制

针对镍基合金具有优良的高温综合性能，且目前市场上几乎没有这类焊条电孤堆焊材抖等实际情况，开发研制了一种抗高温耐磨损的镍基无渣堆焊焊条。该焊条具有焊接烟尘小，烟尘中含对人体有害气体极少；焊后焊道上几乎没有熔渣，连续多层焊无需敲渣：价格低廉(与钴基合金相比)，高温(650℃左右)性能优良等特点。谊焊条的成功研制改善了工作环境、提高了工作效率、较好地满足了实际生产需要。     

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。     

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.     

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.