Thermomechanical treatment of super high strength Cu-8.0Ni-1.8Si alloy

The microstructures and properties of Cu-8.0Ni-1.8Si alloy subjected to different heat treatments were examined by mechanical and electrical properties measurements, optical and transmission electron microscopes observation. The results show that the precipitation process during aging can be accelerated by the cold deforming before aging. As the Cu-8.0Ni-1.8Si alloy is subjected to solution treatment at 970 ℃ for 4 h, cold rolling to 60% reduction, and then aging at 450 ℃ for 60 min, its properties are σb=1 050 MPa, σ0.2=786 MPa, δ=3.2% and conductivity 27.9%（IACS）. The strengthening mechanisms of the alloy include spinodal decomposition strengthening, ordering strengthening and precipitation strengthening. The precipitation of the alloy is nano-scale Ni2Si phase.     

Nb-Ti连铸坯热芯大压下轧制动态再结晶行为研究

采用热模拟单道次压缩实验，研究了Nb-Ti连铸坯热芯大压下轧制中动态再结晶行为及奥氏体晶粒转变规律。结果表明，变形温度越高，应变速率越低，发生动态再结晶的临界应变值越小，动态再结晶越充分。在变形温度1 350 ℃，继续增加应变至0.8和增加应变速率至10 s^-1，奥氏体晶粒尺寸并未得到进一步细化，反而较应变0.5和应变速率5 s^-1下的奥氏体晶粒更加粗大。这是因为高温粘塑性区的金属晶间粘性流动增加，位错增殖速度增大，在动态再结晶过程中会重新形成新的无畸变再结晶晶粒，这些新的无畸变晶粒的亚动态再结晶动力学极快，在较大驱动力下使奥氏体晶界快速迁移，从而使奥氏体发生一定程度的粗化。     

EH47钢连铸坯热芯大压下轧制应变诱导析出行为

研究了EH47微合金钢连铸坯经传统轧制和热芯大压下轧制后室温下的组织和析出相形貌,并采用MMS-200热模拟双道次压缩实验研究了其经热芯大压下轧制后的第二相粒子应变诱导析出行为。结果表明:热芯大压下轧制后EH47微合金钢连铸坯的芯部铁素体尺寸较传统轧制的芯部铁素体尺寸明显减小;热模拟双道次压缩实验表明,热芯大压下轧制后,EH47微合金钢的应变诱导析出第二相粒子在位错、晶界、亚晶界上沉淀析出,在一定程度上起到钉扎晶界并阻碍再结晶晶粒长大的作用。     

工业炉加热技术学术研讨会

环保型玻璃防护润滑剂和金属热处理保护涂料涂敷于钛合金、高温合金、不锈钢、结构钢等金属材料表面，随工件加热时，生成熔融致密薄膜，起到防氧化、防脱碳及防渗氢的作用；玻璃防护润滑剂在金属成形时，还起到润滑、绝热和对模具保护的作用；降低锻件的变形抗力、提高模具的使用寿命、锻件可获得更高表面质量。     

表面防护新工艺——机械镀锌

介绍了机械镀锌一新的表面防护技术的工艺特点、镀覆过程及镀层性能。并同热浸镀锌以及电镀锌作了对比。     

热腐蚀中的微电池过程

热腐蚀中存在的微电池过程，主要由热腐蚀过程中金属及合金表面形成的不同氧化物、硫化物及氧化膜中的不均匀性及缺陷等因素引起。提出了预氧化金属及合金试样在熔盐中的电位模型，实验结果基本与理论模型相一致。通过热腐蚀微电池模型，可以解释一些热腐蚀现象。     

Thermochemistry on coordination behavior of samaric chloride hydrate with diethylammonium diethyldithiocarbamate

The complex of samaric chloride lower hydrate-with diethylammonium diethyldithiocarbamate (D-DDC) was synthesized conveniently in absolute alcohol and dry N2 atmosphere. The title complex was identified as Et2NH2[Sm(S2CNEt2)4] by chemical and elemental analyses, the bonding characteristics of which was characterized by IR.T he enthalpies of solution of samaric chloride hydrate and D-DDC in absolute alcohol at 298.15 K and the enthalpies change of liquid-phase reaction of formation for Et2NH2[Sm(S2CNEt2)4] at different temperatures were determined by microcalorimetry. On the basis of experimental and calculated results, three thermodynamic parameters (the activation enthalpy, the activation entropy, and the activation free energy), the rate constant, and three kinetic parameters (the apparent activation energy, the pre-exponential constant, and the reaction order) of liquid phase reaction of formation were obtained. The enthalpy change of the solid-phase title reaction at 298.15 K was calculated by a thermochemical cycle.     

热镀Zn－Al—Mg系合金镀层钢板的大气腐蚀行为

日本日新制钢公司技术研究所采用加速腐蚀试验对热镀Zn-Al—Mg合金镀层钢板的耐蚀性进行了研究和评价。有关的试验和结果介绍如下。     

专利技术

腹板50-100毫米高频焊接连续生产机组；用于自阻加热焊接不导电材料的复合石墨模具。     

热变形参数对Ti-15-3合金显微组织的影响及预测

通过等温压缩试验和金相分析研究了热变形参数对Ti-15-3(Ti-15V-3Cr-3Sn-3Al）合金固溶处理后显微组织的影响，等效晶粒尺寸随变形温度升高而增大，随变形程度和变形速率增加而减小，再结晶程度随变形温度升高而减小，随变形程度和变形速率增加而增大，采用人工神经网络的方法建立了等效晶粒尺寸及再结晶晶粒体积百分数与变形程度，变形速率和变形温度间的数学模型，预测值与实测值吻合较好，表明该方法很好地预测热变形参数对Ti-15-3合金固溶处理后显微组织的影响。