针状铁素体管线钢的组织结构及其与力学性能的关系研究

基于控轧控冷工艺研究,在化学成分相同的超低碳微合金管线钢中获得了不同组成比的针状铁素体（AF）复相组织,探讨了其与力学性能的关系。结果表明：①降低终轧温度导致有效晶粒尺寸明显减小,冷却速度和模拟卷取温度的变化对有效晶粒尺寸影响不大;②降低终轧温度,提高冷速,会促进AF复相组织中粒状贝氏体铁素体（GF）、贝氏体铁素体（BF）等低温组织含量的增加,提高模拟卷取温度增强的析出强化效果不如降低终轧温度导致的AF低温组织含量提高和晶粒细化对强度提高的贡献大;③随着终轧温度的下降,大角度晶界含量先提高后降低,在相变点以上40℃附近达到最高值,大角度晶界含量越高,低温韧性越好;④当管线钢获得较高BF和GF含量、低的准多边形铁素体（QF）含量组成的细小AF组织时,综合力学性能优良。     

β-FeOOH thin film as positive electrode for lithium-ion cells

β-FeOOH thin film was prepared on the surface of a foamed Ni substrate by liquid phase deposition (LPD) method with a chemical equilibrium reaction between metal-fluoro complex and oxyhydroxide to make a low-cost and environmentally friendly positive electrode for high-power batteries. The new film electrode, with a thickness of 316 nm, was found out to give a large discharge capacity of 260 mAh g⁻¹ at 0.05 C rate even without an electro-conductive material. Furthermore, the electrode also showed good discharge performance with the retention of 69.9% at 10-0.05 C current rate, which means a promising positive active material for high-power use.     

5CrMnMo淬火加热保温时间对组织性能的影响

研究了５ＣｒＭｎＭｏ热模钢９００℃强韧化处理时加热保温时间对组织性能的影响。试验表明，试样在９００℃加热淬火时，当保温时间少于１０ｍｉｎ时淬火组织以针状马氏体为主，当保温时间大于３５ｍｉｎ后淬火组织主要是由板条马氏体组成，随着保温时间不断延长，纯板条束中的孪晶区也将不断减少，回火后的冲击韧性值及断裂韧性值有很大提高，研究指出，当５ＣｒＭｎＭｏ热模钢９００℃加热保温６０ｍｉｎ左右淬火后于５２０℃下回火３ｈ时可获最佳综合机械性能，这不但超过传统工艺而且优于复合等温处理工艺。     

高强度细晶粒碳素钢焊接接头熔合区附近的显微组织及精细结构

研究了高强度细晶粒碳素钢焊接接头熔合区附近的显微组织及精细结构。结果表明,在熔化极混合气体保护焊接条件下,该钢材的熔合区宽度为20～40μm。随着焊接线能量的减小,熔合区的整体硬度提高。熔合区焊缝侧针状铁素体的形态与焊接线能量有关。氧化物夹杂大多位于针状铁素体边界。在熔合区母材侧,下贝氏体中的碳化物呈多种形态,并受焊接规范的影响。     

SYP烧结增效剂对烧结生产的影响

为改善烧结矿品质，炼铁新厂在烧结生产中试用了SYP烧结增效剂。通过分析增效剂添加前后烧结矿产、质量指标及燃耗的变化，说明SYP对烧结生产有很大帮助。     

A test device for isotopic γ-ray imaging with CdZnTe detector

A test device for isotopic γ-ray imaging, which consists of an isotope γ-ray source, a CdZnTe γ-ray spectrometer and other auxiliary equipment, is studied here. Compared with the conventional X-ray, the isotope γ-ray,which is utilized in this project, has its own advantages in imaging. Furthermore, with a room-temperature high-energy-resolution CdZnTe detector and a modern imaging processing technique, this device is capable of effectively suppressing the background and gaining more information, thus it can obtain a better image than conventional X-ray devices. In the experiment of PCB imaging, all soldered points and chip components are sharply demonstrated.     

Poly(amidoamine)-G5 dendrimers/noble metal gold hybrid nanoparticles prepared by γ-ray irradiation

In the absence of a chemical reductant and other protective reagents, noble metal gold hybrid nanoparticles are successfully prepared by ⁶⁰Co γ-ray irradiation using fifth-generation poly(amidoamine) dendrimer with surface amine-terminated group as polymeric template. The zerovalent gold is of spherical structure and the particle size is on nanometer scale range of 3-12 nm. The size distribution of gold nanoparticles displays multidispersity. The results of FTIR show that interactions between dendrimer template and gold nanoparticle exist in intra-molecule and inter-molecule of fifth-generation poly(amidoamine) dendrimer.     

Effect of deformation and cooling rate on the transformation behavior and microstructure of X70 steels

The effects of the deformation in the non-recrystallization region of austenite and the cooling rate on the transformation behavior and microstructure of low-carbon low-alloy steel for pipeline application were studied on the thermal-mechanical simulator Gleeble-1500. It was shown that an increase in deformation amount can greatly increase the nucleation site of ferrite when deformed in the non-recrystallization region of austenite, and an increase in nucleation ratio can greatly refine grains. When the cooling rate is accelerated, the driving force of nucleation is increased and the nucleation rate also improves. Ultra-refine grains can be obtained by controlled rolling. The high density of ferrite nucleus, which forms along the austenite grain boundary, twin interface, and deforma- tion band are introduced in the matrix of austenite by the control of hot rolling, after which the microstructure can be refined. It was found that the acicular ferrite has a very fine sub-structure, high dislocation density, and a thin slab with ultra-fine grains. Small M/A islands and cementite are precipitated on the matrix of the slabs by the analysis technique of TEM and SEM.     

β-FeOOH改性蒙脱土复合过氧化氢对罗丹明B的降解

用不同物质的量的β-FeOOH对蒙脱土（MMT）进行改性制备出一系列β-FeOOH-MMT（x）,并将其与过氧化氢（H₂O₂）联用降解罗丹明B（RhB）。考察了RhB模拟废水脱色的影响因素,并研究了不同处理方法的协同效应。结果表明：在pH为5.2、β-FeOOH-MMT（3.5）用量为2 g/L、n（H₂O₂）∶n（Fe）=50∶1条件下搅拌10 min,对20 mg/L的RhB去除率可高达89.3%;对β-FeOOH-MMT（x）进行了拉曼光谱和扫描电镜表征。β-FeOOH-MMT（3.5）表现出丰富的孔结构;β-FeOOH-MMT（3.5）和H₂O₂对降解RhB模拟废水产生了协同效应,降解反应较为接近表观一级动力学,速率增强因子可达到29.32。     

F40高强船板钢组织中针状铁素体形成及细化机制研究

在Gleeble1500上对高强船板钢F40的热轧工艺进行了模拟研究,对晶粒细化机理进行了详细的分析.结果表明,对奥氏体进行两阶段的大压下量轧制,为随后的相变提供更多的形核点和大的形核驱动力,大形变能诱导碳氮化物析出,阻止再结晶后的晶粒长大,但会使相变时间提前,相变温度提高;适当增加冷速能使针状铁素体明显细化,从而获得以针状铁素体为主要组织的多相结构.