静磁场对32CrMnNbV淬透性及耐蚀性能的影响

研究了静磁场（０－１．２Ｔ）对３２ＣｒＭｎＮｂＶ淬透性及蚀性能的影响。实验中发现,在连续冷却过程中加磁场,可以使铁索为的ＣＣＴ曲线左移,淬透性下降;在奥氏体化咖磁场。会降低奥氏体的稳定性,造成冷却过程中ＣＣＴ曲线的左移,而且左移的趋势更明显,当淬火时所加磁场的强度增加到１．２Ｔ,马氏体组织明显细化。此外,磁场下淬火可以提高马氏体的蚀性。随着外磁场的增加,腐蚀速率下降。     

钛含量和奥氏体化温度对20MnMoB钢淬透性的影响

研究了钛含量和奥氏体化温度对20MnMoB钢淬透性的影响。结果表明，过剩钛是决定20MnMoB钢淬透性稳定性的主要参数；20MnMoB钢的淬透性随奥氏体化温度升高存在一个最大值。当过剩伏含量约为0.02%，奥氏体化温度900℃左右时，试验用钢的淬透性最高。     

W6Mo5Cr4V2钢形变诱发析出碳化物及规律

对Ｗ６Ｍｏ５Ｃｒ４Ｖ２钢经１２４０℃奥氏体化后于１７０－１１５０℃形变０－６５％直接淬火过程中诱发析出的碳化物进行了研究。结果表明，在７５０－１１５０℃热形变淬火迁程中均诱发析出直径约１－２μｍ，具有立方ＮａＣｌ晶型的ＭＣ型碳化物；碳化物的分在民形变温度有关，高温形变呈随机分布，而低温下则趋于沿Ｆ１１１Ｇγ滑移面析出呈方向性分布；碳化物的析出量主要由形变温度和该表变温度下热变形奥氏体的组织状态...     

非晶态Fe－Si－B及Fe－W－Si－B合金系显微硬度研究

通过显微硬度测量和Ｘ射线衍射结构分析，研究了非晶态Ｆｅ９６－ｘＳｉ４Ｂｘ（ｘ＝１６．１，１６．３，１７．１，１７．９或２７．２）及Ｆｅ８６．３８－１．０６２ｘＷ０．６２＋０．０６２ｘＳｉ３Ｂ１０＋ｘ（ｘ＝０，５，１０，１２，１３，１４，１５，１６，１８，２０或２２）合金系的显微硬度随合金成分及结构变化的关系。结果表明：此两合金系的显微硬度均随类金属成分增加而增加。热处理后其结构的变化亦引起显微硬度的变化。在等温退火过程中，随着退火时间增加，显微硬度值均出现峰值，这和析出相的类型、尺寸相关，其峰值的大小随着退火温度升高而增加。在等时退火过程中，均在一定温度时出现峰值，这和样品的晶化程度相关。     

奥氏体化温度对Cr17Ni2钢组织和性能的影响

研究了奥氏体化温度对Ｃｕ１７Ｎｉ２钢组织和性能的影响，结果表明，随淬火加热温度的升高，碳化物向奥氏体中逐渐溶解，在１０５０℃加热时碳化物已完全溶解，其冷后组织中δ铁素体量增加，冲击韧度和硬度与组织有良好的对应关系。     

碳和热处理规范对B类‘ASTM A514’含硼钢厚板材机械性能的影响

低合金含硼结构钢经热处理后可达到所要求的综合性能。但是目前还未找到确保钢良好淬透性的最佳热处理规范。一些专家发现,降低奥氏体化温度可以提高钢的淬透性。也有一些人认为,提高奥氏体化温度和淬火时用更快的冷速以促使“有效”硼浓度增大和形成均匀的马氏体组织,从而可以在不改变强度和塑性的情况下提高钢的淬透性和改善其韧性。硼不改变淬火状态下钢的硬度,而减缓回火时钢的软化,但是随着含碳量增加,硼对淬火钢回火     

回火温度对20CrMnMo和17Cr2Ni2Mo钢渗碳层的强韧性及耐磨性的影响

研究了不同低温回火温度对２０ＣｒＭｎＭｏ钢和１７Ｃｒ２Ｎｉ２Ｍｏ钢渗碳层强韧性和耐磨性的影响，结果表明，在１８０－２６０℃之间，随着回火温度升高，两种钢的硬度逐渐下降，１７Ｃｒ２Ｎｉ２Ｍｏ钢的冲击韧性于２２０℃时出现峰值，２４０－２６０℃时明显下降，２０ＣｒＭｎＭｏ钢的冲击韧性变化不明显，似乎２２０℃时出现不明显的峰值，显微硬度沿层深的分布及耐磨性逐渐下降。     

20Cr2Ni4A钢的淬透性

冶金机械制造业中的大型轴承基本上均采用２０Ｃｒ２Ｎｉ４Ａ钢制造。有些轴承圈和滚柱截面超过了１００ｍｍ。本文的目的是用整体淬火法和端面淬火法测定２０Ｃｒ２Ｎｉ４Ａ钢的淬透性，并且确定能保证获得心部硬度不低于３０ＨＲＣ的最大截面。     

等淬温度对等淬球铁中残余奥氏体及其力学性能的影响

研究了等温淬火温度对等淬球铁中残余奥氏体及其力学性能的影响。试验结果表明：在试验的温度范围内（270～380℃），试样中残余奥氏体的含碳量（质量分数）及奥氏体百分含量（体积分数）随着等温淬火温度的升高先增大后减小，均在360℃等温淬火时，出现最大峰值；抗拉强度随着等温淬火温度的升高而逐渐降低；伸长率和冲击韧度随着等温淬火温度的升高先增大后减小，在360℃等温淬火时，出现最大峰值；硬度则随着等温淬火温度的升高先减小后增大，在360℃等温淬火时，硬度最低。     

快速凝固Al-Cr-Zr-Fe合金的时效特性

用电镜分析了快凝Ａｌ－４Ｃｒ－４Ｚ－２Ｆｅ合金的时效组织,测定了其相应的显微硬度,表明,合金在４００℃时效６ｈ后,其硬度达到峰值１３ＨＶ,此时的析出相为Ｌｌ２－Ａｌ３Ｚｒ和Ａｌ４（Ｃｒ,Ｆｅ）,时效时间过长会因析出相粗化导致硬度下降。     

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.     

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。     

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.     

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.