Effects of an Ingot Smelting Method and Pressure Treatment Modes on the Structure of Deformed TiNi-Based Alloy Semi-Finished Products

Metallurgist - It is shown that the pressure treatment of titanium nickelide alloys should be carried out in two stages. At the first stage, ingots are deformed in order to transform the brittle...     

Mathematical Model of the Accelerated Cooling of Metal in Thick-Plate Hot Rolling

Metallurgist - The paper describes the issues in predicting the consumer properties of thick-plate pipe products manufactured at the hot rolling mill 5000 of the Magnitogorsk Iron and Steel Works....     

Structure and Properties of an Ni3Al Intermetallic Compound Formed as a Result of Spark Plasma Sintering of the Powder Mixtures Prepared by Various Methods

Metallurgist - The paper described the structure and mechanical properties of nickel aluminide (Ni3Al) obtained by spark plasma sintering of the two compositions of nickel and aluminum powder...     

Metallurgical Features of Plasma Surfacing Repair of Magnesium Alloys

Metallurgist - Results are provided for studying formation of the structure and properties of products made of high-strength light alloy ML5 of the magnesium-aluminum-manganese-zinc system using...     

Method for Controlling the Parameters and Characteristics of an Electric Arc to Evaluate the Efficiency of Using Briquetted Metallized Scale for Steel Smelting

Metallurgist - A method for controlling dynamic current-voltage characteristics in an electric arc furnace is described. The influence of the electrode’s current direct component on the...     

Synthesis of titanium aluminide coatings on aluminum and titanium surfaces by mechanical alloying and subsequent annealing

Intermetallic Ti-Al-based coatings were synthesized by mechanical alloying in a vibratory ball mill and subsequent annealing. A titanium layer was deposited on aluminum specimens and an aluminum layer and aluminum-titanium mixture were deposited on titanium specimens. Under the effect of milling balls, powder particles deposit at the substrates, forming layers that have a very good cohesion with the substrate. During subsequent heating, diffusion layers on the basis of titanium-aluminum phases are synthesized as a result of the chemical interaction between titanium and aluminum. In the case of titanium layer deposited on aluminum, the temperature interval of transformations is 600–650°C; first, a Ti₃Al₅-based phase is formed; then, as diffusion saturation with Al increases, an Al₂Ti-based layer appears; and finally, the Al₃Ti compound is formed. The reaction rates depend on the temperature and the duration of annealing. On titanium with a (Ti + Al) layer deposited on its surface, the Al₃Ti, Al₂Ti, TiAl, and Ti₃Al compounds are formed in a temperature interval of 600–900°C. In the case of deposition a homogeneous aluminum layer on titanium, only Al₃Ti and Ti₃Al phases were observed after annealing.     

机械合金化Al—12Ti—6Nb合金的热稳定性

将机械合金化（ＭＡ）Ａｌ－１２Ｔｉ－６Ｎｂ合金在５５０℃下空气中长时间暴露后，用光学显微镜和电子探针对其组织结构变化进行了观察与分析，测定了维氏硬度。结果表明，ＭＡＡｌ－１２Ｔｉ－６Ｎｂ表现出良好的热稳定性，在５５０℃下暴露２００ｈ后，Ａｌ３Ｔｉ中的亚稳的α－Ｔｉ核才全部转变为Ａｌ３Ｔｉ，Ａｌ３Ｔｉ颗粒随之粗化，饼状的Ａｌ３Ｔｉ变成椭球体；Ａｌ３Ｔｉ颗粒的粗化是通过Ｔｉ，Ａｌ原子扩散所控制的α－Ｔ     

埋弧自动焊在大口径钢卷管焊接上的应用

为把埋弧焊应用在大口径钢卷管焊接上,分析了焊接工艺设计、焊接工装设计和纵缝、环缝焊接的施工要点,经过实际施工验证了这种方法是成功的,效益是高的。     

我国环保产业研究与发展的探讨

在总结我国环保产业研究与发展现状的基础上 ,指出我国环保产业的发展必须得到理论研究的指导 ,并对有关问题进行了深入地探讨。根据我国加入WTO后的环保产业现状 ,预测、分析了将在我国环保产业形成投资热点的几个领域