Al-Zn-Mg合金板淬火时效工艺研究

试验研究了Al-Zn-Mg合金板淬火温度、人工时效温度及时间与组织性能的关系,确定了此合金板材的淬火、时效生产制度:淬火温度(472±2)℃;人工时效温度及时间:(120±5)℃24 h.     

一种Al-Mg—Si铝合金板材固溶处理及人工时效工艺研究

研究固溶处理温度、保温时间、淬火转移时间、时效前停放时间、时效温度、时效保温时间等工艺参数对一种Al-Mg-Si合金板材的组织及性能的影响.确定:该种Al-Mg-Si板材淬火加热温度为525℃±2℃;淬火加热保温时间为30 min～70 min;淬火转移时间t1≤30 s;淬火后停放时间t2≤4 h;时效温度为180℃±5℃;时效时间为10 h.     

2014铝合金板材热处理工艺研究

试验研究了退火温度、退火时间、淬火温度、淬火时间、时效温度和时效时间等因素对2014铝合金板材组织与性能的影响。确定了2014铝合金薄板各种热处理工艺参数:退火温度380℃,退火保温时间1 h;淬火温度500℃,淬火加热保温时间10 min;时效温度160℃,时效保温时间12 h。在工业生产条件下,采用以上确定的热处理工艺参数生产出O状态、T4状态和T6状态的薄板,其性能均完全达到标准中规定的指标。     

7075-T7651铝合金厚板热处理工艺研究

研究了7075合金淬火温度、转移时间、停放时间、双级时效等因素与组织性能的关系，确定了7075－T7651厚板的生产制度：淬火温度为470℃，转移时间25s内，拉伸量1.5%-2.5%，淬火到时效的间隔时间24h内，双级时效制度为120℃5h 160℃ 18h，其中二级时效温度是影响板材综合性能的主要因素。     

时效处理对6111铝合金组织性能的影响

通过力学测试、透射电镜等分析,研究了自然时效和80、100、120℃预时效处理对6111铝合金板材人工时效硬化性能的影响。结果表明:固溶后经过预时效处理的板材人工时效硬化响应明显高于自然时效处理的,预时效温度120℃的在人工时效阶段强化效果高于预时效80℃和100℃的,人工时效时间越长硬度值越高;在人工时效温度为200℃时达到峰时效所需时间最短,在过时效状态合金材料出现明显的软化现象,人工时效温度200℃时软化效果更显著。自然时效会抑制人工时效过程的强化性能,随自然时效时间的增加,人工时效硬化效果逐渐降低。     

时效前停放时间和时效保温时间对6082-T651铝合金板材组织和性能的影响

切取工业生产条件下生产的6082铝合金13.0 mm厚度的热轧板材试样在盐浴炉内加热至(525±2)℃保温60m in,水中淬火。然后进行人工时效,研究人工时效前停放不同时间、人工时效过程保温不同时间等工艺参数对6082-T651铝合金板材力学性能和显微组织的影响。结果表明,在工业生产条件下6082-T651铝合金板材人工时效前最佳停放时间为不超过4 h,人工时效的保温时间以12 h～20 h为宜。     

Al-Zn-Mg-Cu合金板材时效工艺对其硬度和电导率的影响

从一种Al-Zn-Mg-Cu合金5.0 mm厚度的热轧-中温轧制板材切取试料,在盐浴炉中进行470℃1 h固溶处理、水中淬火,然后进行不同人工时效制度处理,从而研究单级时效制度、双级时效制度对该Al-Zn-Mg-Cu合金板材的硬度、电导率的影响,确定了采用双级人工时效工艺制度处理该合金板材可获得好的综合性能。为实际生产该合金板材提供了一定的依据和技术支持。     

2195合金锻造管的淬火与时效工艺

研究了2195合金大规格锻造管的淬火与时效工艺。通过拉伸试验、金相显微仪和透射电镜考察了热处理工艺参数对其力学性能和显微组织的影响。淬火敏感性试验表明,产品必须采用水冷方式淬火,但对冷却水的温度可以不作严格控制。不同温度的人工时效工艺试验表明,低温峰值时效可以使产品获得较高的强度和理想的伸长率,而时效温度升高将导致沉淀相粗化,使产品的强度下降。合理的2195合金锻造管的淬火工艺为500℃固溶、水冷淬火,人工时效制度为150℃时效195 h。     

6022铝板热冲压淬火一体化工艺固溶条件对强化的影响

利用中心点响应面法进行铝板热冲压淬火一体化实验设计,通过常温单向拉伸实验、热像仪测温及扫描电镜金相观察,研究了固溶处理工艺参数及淬火冷却速率对成形件强度的影响。实验结果表明:固溶处理工艺参数即固溶温度、固溶时间的最优参数范围分别为520~545℃,35~45 min。在此条件下,经时效温度180℃,时效时间60 min的人工时效处理后成形件的抗拉强度最高可达到370 MPa。选取最优工艺参数范围中的固溶温度520℃,固溶时间35 min的工艺过程,进行淬火温度测量及成形件金相观察,发现通过室温条件下的模具淬火可以实现成形件的快速冷却,并且成形件经人工时效后可得到细小且弥散分布的强化相。     

双级淬火对车身板用6016铝合金烤漆硬化效应的影响

以硬度为主要表征手段研究双级淬火的中间淬火温度和保温时间对6016铝合金板材的时效及模拟烤漆行为的影响。采用DSC和透射电镜对比分析常规淬火和双级淬火对随后自然时效态样品与烤漆态样品纳米相的影响。结果表明:最佳的中间淬火工艺制度为(100℃,1 h),并且该工艺下合金自然时效过程性能稳定,但随后人工时效硬化速率大;双级淬火样品自然时效后表现出良好的塑性(δ28%)、成形性(σ_(0.2)120MPa,n≈0.24,r≈0.78)和模拟烤漆后强化能力(σ_(0.2)220 MPa,PBR110MPa)。双级淬火样品在100℃淬火时形成了均匀弥散并大于临界尺寸的Mg-Si团簇。这些团簇可抑制自然时效过程中小尺寸团簇的形成,从而保持这些样品的性能基本不变。这些团簇使得随后人工时效过程中β″相激活能由76.0 kJ/mol降至57.5kJ/mol,促进了模拟烤漆后形成的β″相的析出,从而提高双级淬火样品的烤漆硬化效果。     

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。     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

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.     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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