预正火对GCr15钢奥氏体晶粒长大的影响

研究了经不同温度预正火的ＧＣｒ１５钢奥氏体化后的晶粒尺寸。结果发现，适当温度的预正火可以细化奥氏体的晶粒；随着预正火温度的升高．晶粒粗化温度降低。     

GCr15钢非平衡组织激光回热时的组织转变

对ＧＣｒ１５钢过热淬火和回火组织激光回热时的组织转变进行了研究。结果表明，快速加热时原始组织中的残余奥氏体未发生分解，直接向周围以扩散机制长大，导致原粗大奥氏体晶粒的恢复。加热温度进一步升高将发生奥氏体再结晶，使组织细化，再结晶核心优先在粗大马氏体片处形成。深冷处理有助于避免和消除组织遗传。     

GCr15钢非平衡组织激光加热时的组织转变

对ＣＣｒ１５钢过热淬火和回火组织激光加热时的组织转变进行了研究。结果表明，快速加热时原始组织中的残余奥氏体未发生分解，直接向周围以扩散机制长大，导致原粗大奥氏体晶粒的恢复。加热温度进一步升高将发生奥氏体再结晶，使组织细化，再结晶核心优先在粗大马氏体片处形成。深冷处理有助于避免和消除组织遗传。     

40Cr钢宽带激光淬火组织和性能研究

对４０Ｃｒ钢宽带激光淬火组织和硬度分布进行了较细致的研究，结果表明，激光淬火区组织结构和硬度沿层深明显变化，淬火区中奥氏体呈薄膜状，不连续地分布于马多体间，除位错亚结构外，在局部地区还出现平行排列的微细孪晶组织。     

不均匀因子与工具钢奥氏体晶粒长大的控制

测定了Ｔ１０、ＧＣｒ１５、６ＣｒＷ２Ｓｉ、ＹＫ 等钢种在不同奥氏体化条件下的不均匀因子及其对奥氏体晶粒长大的影响规律。试验结果表明，不均匀因子与材料成分、原始组织及加热工艺密切相关。在临界点以上选取合适温度进行分级加热可有效地降低奥氏体不均匀因子，限制平均晶粒直径，最终晶粒度可比相同温度直接加热提高２ ～３ 级，从而既可遏制奥氏体晶粒的异常长大，又有利于调整奥氏体成分，为解决中碳高合金ＹＫ 钢的强韧化热处理提供了工艺途径。     

40Cr钢宽带激光淬火组织和性能研究

对４０Ｃｒ钢宽带激光淬火组织和硬度分布进行了较细致的研究,结果表明,激光淬火区组织结构和硬度沿层深明显变化,淬火区中奥氏体呈薄膜状,不连续地分布于马氏体间。除位错亚结构外,在局部地区还出现平行排列的微细孪晶组织     

不均匀因子工具钢奥氏体晶粒长大的控制

测定了Ｔ１０、ＧＣｒ１５、６ＣｒＷ２Ｓｉ、ＹＫ等钢种在不同奥氏体化条件下的不均匀因子及其对奥氏体晶粒长大的影响规律。试验结果表明，不均匀因子与材料成分，原始组织及加热工艺密切相关。在临界点以上选取合适温度进行分级加热可有效地降低奥氏体不均匀因子，限制平均晶粒直径，最终晶粒度可比相同温度直接加热提高２－３级，从而既可帽奥氏体晶粒体的异常长大，又有利调整奥氏体成人灵解决中碳高合金ＹＫ钢的强韧化热处理提     

高淬透性轴承钢GCr15SiMo的工艺性能

研究了高淬透性轴承钢ＧＣｒ１５ＳｉＭｏ的热处理工艺。研究结果表明，ＧＣｒ１５ＳｉＭｏ钢具有良好的热处理工艺性，从８３０－８７０℃油淬后，硬度在６５ＨＲＣ以上，淬裂敏感性小，并具有良好的抗回火性。可适用于制造要求尺寸稳定，在２５０℃以下工作的特大型轴承。试生产结果表明，ＧＣｒ１５ＳｉＭｏ钢的淬透性明显地优于ＧＣｒ１５ＳｉＭｎ钢。     

喷射成形复合轧辊的显微组织

用喷射成形法制造Ｃｒ１２ＭｏＶ钢－碳钢复合轧辊，检验其表面沉积层显微组织，以研究喷射成形工艺的影响。通过金相、透射电镜、电子探针和Ｘ射线衍射等方法检查了Ｃｒ１２ＭｏＶ钢的组织特征。研究表明，喷射成形Ｃｒ１２ＭｏＶ钢的显微组织与传统方法加工的不同。喷射成形材料的晶粒为均匀，细小的等轴品，平均粒度约为１８μｍ，组织致密，无宏观偏析。在马氏体基体上，观察到相当数量的残余奥氏体，钢中经物的类型未变，Ｃｒ７     

淬火温度对低合金耐蚀27CrMo48VNb钢油井管组织的影响

通过系列温度淬火试验对低合金耐蚀27CrMo48VNb钢油井管进行热处理,并采用光学显微镜和透射电镜对不同温度淬火后组织、原奥氏体晶粒以及析出相进行了观察,研究了淬火温度对试验钢组织、晶粒尺寸和析出相的影响。结果表明,试验钢淬火后形成了马氏体组织。随着淬火温度升高,淬火后马氏体组织和原奥氏体晶粒尺寸逐渐增加。当淬火温度为890~1000 ℃时,随着淬火温度升高,晶粒尺寸增加较小;当淬火温度超过1000 ℃时,随着淬火温度升高,原奥氏体晶粒显著粗化。组织和原奥氏体晶粒尺寸随淬火温度的变化趋势与高温析出相溶解析出行为有关。试验钢的淬火温度应控制在890~1000 ℃。     

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.