铍环制备工艺的研究

介绍了利用电火花成形机加工外径Х０．２～０．３ｍｍ、内径Х０．１～０．２ｍｍ的铍环和外径Х０．３７ｍｍ、凸台直径Х０．２ｍｍ、内径Х０．１３ｍｍ、台阶高度０．０２ｍｍ的带台阶的铍环制备工艺,着重研究了制备的方法,铍片的固定装夹。加工参数的选择以及台阶高度和内外圆的同轴度。     

Х121～133mm钢管的开发实践

介绍了安钢钢管厂通过对原炼钢、开坯、轧管系统进行合理改进,优化工艺参数,从而在Х１００ｍｍ自动轧管机组上生产出Х１２１～Х１３３ｍｍ钢管。     

Х114mm穿孔机推钢机的改进

简介了山东烟台钢管总厂对Х１１４ｍｍ穿孔机的推钢机进行技术改进的情况,该改进使设备停机故障率明显降低,备件费用大幅度下降。     

各种钢铁的焊接

20091162减少焊接辊轮用Х12МФ钢的碳化物非均质性[俄]/ТюринНФ…//Сталь.-2007(1):69~74研制并采用了天然特性即为非均质性较强的Х12МФ和Х12ВМФ高碳模压铬钢的生产工艺。确定了在这些钢中当结晶至1~5级时,为从一次奥氏体晶界清除碳化共晶体析出物所需的,以及能够在压床上把钢锭加工成不同直径的锻件而无损伤和形成裂纹及其它缺陷的最佳含钙量(分别为不少于0.006%和0.014%)。0.07%~0.20%Ti的微合金化由于优先形成低扩散碳化物,以及其它元素(钒,钼)的碳化物,导致一定程度的缺碳,创造了在固溶体和碳化相之间重新分布铬的条件,从而有助于减少碳化非均质性。在1160±20℃进行钢锭均质化时会强化这种效果。与Х12МФ钢相比,根据回火温度(300~550℃)Х12ВМФ钢在耐热性和冲击韧性上的提高,证明将其用于焊接辊轮和工作部分允许加热至500~550℃的模压工装的好处。将Х12ВМФ钢用于焊接辊轮,其初次安装的稳定性与Х9ВМФ-Ш钢制辊轮相比,平均至少提高4.6倍,与日本钢相比提高0.6倍。同时还使成本下降至1/6并延长使用期2年以上。图4表2参232009116...     

渗碳钢热喷丸处理的效果

工业上应用的喷丸强化能赋予渗碳钢接触强度的非单值影响:合理强化规范下,12Х2Н4А和12Х2НВФА钢的这个特性值得到提高; 16Х3НВФМБ-Ⅲ钢在任一喷丸规范下则会降低这个特性值。后形变低温回火将会提高两种钢的接触强度,不过其受试验温度之制约。本文阐述了由于采取热喷丸处理,其中包括渗碳表面烘热至250℃的形变强化,增宽了工作温度范围的理由。     

各种钢铁的焊接

20091162减少焊接辊轮用Х12МФ钢的碳化物非均质性[俄]/ТюринНФ…//Сталь.-2007(1):69~74研制并采用了天然特性即为非均质性较强的Х12МФ和Х12ВМФ高碳模压铬钢的生产工艺。确定了在这些钢中当结晶至1~5级时,为从一次奥氏体晶界清除碳化共晶体析出物所需的,以及能够在压床上把钢锭加工成不同直径的锻件而无损伤和形成裂纹及其它缺陷的最佳含钙量(分别为不少于0.006%和0.014%)。0.07%~0.20%Ti的微合金化由于优先形成低扩散碳化物,以及其它元素(钒,钼)的碳化物,导致一定程度的缺碳,创造了在固溶体和碳化相之间重新分布铬的条件,从而有助于减少碳化非均质性。在1160±20℃进行钢锭均质化时会强化这种效果。与Х12МФ钢相比,根据回火温度(300~550℃)Х12ВМФ钢在耐热性和冲击韧性上的提高,证明将其用于焊接辊轮和工作部分允许加热至500~550℃的模压工装的好处。将Х12ВМФ钢用于焊接辊轮,其初次安装的稳定性与Х9ВМФ-Ш钢制辊轮相比,平均至少提高4.6倍,与日本钢相比提高0.6倍。同时还使成本下降至1/6并延长使用期2年以上。图4表2参232009116...     

P6M5钢制冷镦冲头的热处理

在大量或批量生产中,高速钢,特别是P6M5钢被广泛地用于制造各种冷冲压工具。当工具的工作应力很高时(达22兆帕),例如,冷镦中碳钢和低合金时(如35、40Х、38ХГНМ等),采用这类钢是有效的。这是因为,经淬火和多次高温回火后,在高速钢组织中几乎不存在能明显地降低接触强度的残余奥氏体。利用低合金的8Х4В2С2МФ(ЗП761)、6Х4М2С(ДИ55)钢的弥散硬化,不可能达到P8M5钢那样的综合性能,     

La0.7Y0.3Ni3.4-xMnxAl0.1(Х=0~0.5)储氢合金微观结构和电化学性能

采用真空电弧熔炼及热处理的方法制备La0.7Y0.3Ni3.4-ХMnХAl0.1(Х=0~0.5)合金,通过XRD、SEM、EDS和电化学测试等方法,系统地研究了Mn替代Ni对合金微观组织、储氢和电化学性能的影响规律。结果表明,退火合金微观组织由主相Ce2Ni7型相和杂相PuNi3型、CeNi3型及Ce5Co19型相组成,Ce2Ni7型主相的丰度随Mn含量增加呈先增大后减小变化规律。当Х=0.2时,主相的丰度达到最大值89.03%。增加Mn的含量有助于缓解合金的氢致非晶化倾向。随着Mn含量的增加,合金电极的放电容量逐渐升高,而充放电循环稳定性却逐渐降低,合金电极的最大放电容量和最佳循环稳定性分别为308.6mAh/g与95.09%。合金电极的反应动力学分析结果表明,氢原子在合金体相中的扩散为合金电极高倍率放电性能的动力学控制步骤。     

埋弧自动焊参数对单面焊双面成形质量的影响

给出了板厚６ｍｍ，８ｍｍ，１０ｍｍ，１２ｍｍ的０９ＣｒＮｉＰＣｕ钢板埋弧自动焊单面焊双面成形的基冷焊接参数，并以１０ｍｍ板为便，研究了焊接参数对焊缝形状尺寸的影响。     

100mmX100mm纯铝方锭的水平连铸工艺试验

简述了１００ｍｍ×１００ｍｍ纯铝方锭的水平连铸工艺试验，并从生产现场出发，浅析了影响１００ｍｍ×１００ｍｍ纯铝方锭质量的工艺因素。     

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.     

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.