稳定冷轧轴承钢带球化退火工艺

对冷轧真空精炼轴承钢带的球化退火工艺进行了试验，并探讨了冷轧和热处理工艺对球化的影响，得出了较为理想的球化退火工艺和退火后的性能，并取得了较好的经济效益。     

本钢1850 mm连续退火机组和冷轧汽车板的生产

随着我国汽车工业的迅猛发展,要求生产汽车板的设备装备水平和生产技术水平不断提高,以满足对汽车板表面质量、力学性能和轻量化等要求。本文详细介绍了本钢1850mm连续退火机组的主要技术参数、产品结构、工艺流程及其先进的生产设备,以及汽车板生产情况。     

铜—硬铝（LY12）复合板的爆炸焊接与轧制

研究了铜(T2)—硬铝(LY12)复合板的爆炸焊接,轧制和退火工艺,提供了不同状态下,复合板的成分、组织和性能的检验资料。这些资料为这种爆炸复合材料的实际应用提供了依据。     

The influence of thermal annealing on residual stresses and mechanical properties of arc-evaporated TiCxN1−x (x=0, 0.15 and 0.45) thin films

We report the stress relaxation behavior of arc-evaporated TiC_xN_1−x thin films during isothermal annealing between 350 and 900°C. Films with x=0, 0.15, and 0.45, each having an initial compressive intrinsic stress σ_int=−5.4 GPa, were deposited by varying the substrate bias V_s and the gas composition. Annealing above the deposition temperature leads to a steep decrease in the magnitude of σ_int to a saturation stress value, which is a function of the annealing temperature. The corresponding apparent activation energies for stress relaxation are E_a=2.4, 2.9, and 3.1 eV, for x=0, 0.15, and 0.45, respectively. TiC_0.45N_0.55 films with a lower initial stress σ_int=−3 GPa, obtained using a high substrate bias, show a higher activation energy E_a=4.2 eV. In all the films, stress relaxation is accompanied by a decrease in defect density indicated by the decreased width of X-ray diffraction peaks and decreased strain contrast in transmission electron micrographs. Correlation of these results with film hardness and microstructure measurements indicates that the stress relaxation is a result of point-defect annihilation taking place both during short-lived metal-ion surface collision cascades during deposition, and during post-deposition annealing by thermally activated processes. The difference in E_a for the films of the same composition deposited at different V_s suggests the existence of different types of point-defect configurations and recombination mechanisms.     

基于遗传算法和模拟退火算法的TDOA定位技术

提出一种基于遗传算法与模拟退火算法的TDOA定位估计算法,该算法通过对求解定位坐标计算时的最大似然函数进行求解,实现了利用所有TDOA测量值对移动台的定位估计。该算法采用实数编码,自适应交叉率和变异率实现遗传算法的全局搜索,引入模拟退火的Boltzmann机制,解决遗传算法容易陷入局部最优的问题。实验结果表明,该算法定位精度高、收敛速度快。     

基于Single—Sequence布图规划线长约束问题的研究

布图规划是VLSI设计中非常重要的步骤。Single—Sequenc是一种非常有用的表示布图的编码方法。在实际的布图规划中,由于线长对芯片性能有较大的影响,因此为了使芯片的整体性能达到最优,考虑线长因素,使线长尽可能短。该论文提出了在用模拟退火算法寻求最优布图的同时,通过对算法加以改进,考虑线长约束条件,有效地解决了布图规划的线长约束问题。     

Optimization of annealing cycle parameters of dual phase and interstitial free steels by multiobjective genetic algorithms

Data-driven models have been constructed for Dual Phase (DP) and Interstitials Free (IF) steels using an evolutionary approach. DP steel data are utilized from an existing database, while for the IF steels, data generated at an integrated steel plant have been used. The objective function for Ultimate Tensile Strength (UTS) and % elongation, created as data-driven models, is simultaneously optimized for an optimum strength-ductility balance and the results indicate the possibilities of developing steels with better mechanical properties than what are known to have been existing so far.     

Low temperature annealing of metals with electrical wind force effects

Conventional annealing is a slow, high temperature process that involves heating atoms uniformly, i.e., in both defective and crystalline regions. This study explores an electrical alternative for energy efficiency,where moderate current density is used to generate electron wind force that produces the same outcome as the thermal annealing process. We demonstrate this on a zirconium alloy using in-situ electron back scattered diffraction(EBSD) inside a scanning electron microscope(SEM) and juxtaposing the results with that from thermal annealing. Contrary to common belief that resistive heating is the dominant factor, we show that 5 × 10~4 A/cm~2 current density can anneal the material in less than 15 min at only135?C. The resulting microstructure is essentially the same as that obtained with 600?C processing for360 min. We propose that unlike temperature, the electron wind force specifically targets the defective regions, which leads to unprecedented time and energy efficiency. This hypothesis was investigated with molecular dynamics simulation that implements mechanical equivalent of electron wind force to provide the atomistic insights on defect annihilation and grain growth.     

Tailoring the secondary phases and mechanical properties of ODS steel by heat treatment

The oxide dispersion strengthened (ODS) steel with the nominal composition of Fe–14Cr–2W–0.3Ti–0.2V–0.07Ta–0.3Y₂O₃ (wt%) was fabricated by mechanical alloying and hot isostatic pressing (HIP). In order to optimize the relative volume fraction of secondary phases, the as-HIPed ODS steel was annealed at 800 °C, 1000 °C, 1200 °C for 5 h, respectively. The microstructures and different secondary phases of the as-HIPed and annealed ODS samples were identified by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The tensile properties of all the ODS steels at room temperature were also investigated. The results indicate that annealing is an effective way to control the microstructure and the integral secondary phases. The annealing process promotes the dissolution of M₂₃C₆ particles, thus promoting the precipitation of TiC. No obvious coarsening of Y₂Ti₂O₇ nanoparticles can be observed during annealing. The tensile results indicate that the annealed ODS sample with the optimized secondary phases and high density possesses the best mechanical properties.     

多步热处理对未掺杂LEC SI-GaAs特性的影响

对未掺杂ＬＥＣＳＩ－ＧａＡｓ进行了“三步热处理”。用霍尔测量、光激电流谱测量和化学腐蚀方法研究了这种热处理对电阻率、迁移率、电活性缺陷、位错密度及Ａｓ沉淀的影响。