Correction to: Structure Formation in the Zones of Joints Obtained by Explosion Welding with Subsequent Rolling of a Five-Layer Titanium-Steel Composite

Metallurgist - The fifth author’s name should read V. O. Kharlamov.     

Structure of the Interlayer Boundary of Layered Metal Materials with an Internal Protector Obtained Via Explosion Welding

Metallurgist - Multilayer metal composite materials are used in the chemical industry, particularly nuclear power engineering, and enable to increase the robustness and durability of steel...     

镍—钛爆炸+轧制复合板的退火

本文叙述了退火热处理后,镍-钛爆炸+轧制复合板的成分、组织和性能的变化,从而为该双金属退火制度的制订提供了依据。     

The Structure Formation and Hardness of High-Entropy Alloy Coatings Obtained by Electrospark Deposition

Powder Metallurgy and Metal Ceramics - This paper examines the use of high-entropy alloys (HEAs) as materials for electrospark deposition (ESD). This method is known to produce high-quality...     

Use of Corrosion-Resistant Steels Alloyed with Nitrogen as a Bimetal Cladding Layer Prepared by Explosion Welding

Metallurgist - Research results are used to confirm the compatibility of workable chromium martensitic steels alloyed with nitrogen for a cladding layer and low-alloy steels as the base layer in...     

Effect of the Grain Size of the Initial Structure of 1565chM Alloy on the Structure and Properties of the Joints Fabricated by Friction Stir Welding

The effect of the initial grain size in the structure of the aluminum 1565chM alloy on the mechanical properties of the welded joints formed by friction stir welding and on the grain size in the weld core is studied. It is shown that the design of tool and, especially, the parameters of a screw groove exert a great effect on the grain size in the weld core.     

一种简易焊接技术在冷轧线上的应用

莱钢板带厂为提高冷轧带钢的成材率和年产量，采用了一种简易的焊接技术，即将轧机轧制时切下的带头焊接在钢卷的头尾部，以及将酸洗前的小钢卷拼焊成大钢卷。焊接引带的设备主要由开卷机、卷取机、矫直机、液压剪、夹紧对中装置和复合焊机组成。此技术使焊接设备得到简化，能够在酸洗钢卷上焊接可靠的轧制引带，使成材率提高了2％，产量提高了20％。     

Formation of Gradient Structures in the Zone of Joining a Deformable Nickel Alloy and a Single-Crystal Intermetallic Alloy during Thermodiffusion Pressure Welding and Subsequent Heat Treatment

The possibility of formation of a high-quality solid-phase joint of an Ni₃Al-based single-crystal intermetallic VKNA-25 blade alloy with a high-temperature deformable EP975 disk alloy by pressure welding is studied to create high-performance one-piece blisk unit for the next-generation aviation gas turbine engines and to decrease the unit mass. The influence of the conditions of thermodiffusion pressure welding under the hightemperature superplasticity of the disk alloy and the influence of heat treatment of welded joints on the gradient structures in the welded joint zone and the structure at the periphery of the welded samples are investigated.     

Conceptual Design and Analysis of a Deployable Structure with Flexible Joints

The conceptual design of a self-deployable structure with flexible joints is presented in this paper. Joints store elastic energy in the folded, prestressed position and allow deployment until they are stopped by tendons. A study on a wire rope joint is first presented to determine its mechanical behavior with experimental, theoretical, and numerical approaches. An analysis is then performed on a bidimensional structure to propose the specific modeling of introducing prestress to the joints. The method is applied to a spatial system in an analysis that uses static equilibrium and kinematic deployment simulations. The results show good concordance among the different approaches.     

Investigation of the Processes of the Formation of a Nonequilibrium Phase-Structural State in FeTiB Films Obtained by Magnetron Sputtering

Russian Journal of Non-Ferrous Metals - The main trends in the modern development of magnetic microelectronics are miniaturization and operation speed, while ensuring efficient operation in the MHz...     

爆炸法消除100t转炉炉壳中腰环缝的焊接残余应力

采用爆炸技术消除武钢平改转工程两台１００ｔ转炉的７０ｍｍ厚２０ｇ炉壳中腰环缝的焊接残余应力，残余应力消除率大于６２％，不仅消除残余应力效果显著，而且快速简便，为工程进展节约了大量的时间和费用。     

Formation of a Network Structure in the Gaseous Reduction of Magnetite Doped with Alumina

Reduction of un-doped magnetite is developed topochemically with the formation of a dense iron shell. However, the reduction of alumina-doped magnetite to wüstite proceeds with the formation of a network-like structure which consists of criss-crossed horizontal and vertical plates of wüstite. Reduction of magnetite includes the conversion of Fe³⁺ to Fe²⁺ and the movement of iron cations from the tetrahedral sites on the {400} and {220} planes of magnetite to the octahedral sites on the {200} planes of wüstite. Alumina has a negligibly small solubility in wüstite. In the reduction of magnetite doped with Al₂O₃, rejected Al³⁺ cations from wüstite diffuse to the magnetite–hercynite solid solution. Enrichment of the Fe₃O₄–FeAl₂O₄ solution with alumina in the vicinity of the reduction interface restricts the growth of {220} planes of wüstite and nucleation of {220} planes adjusted to the existing planes, preventing the merging of wüstite plates during the reduction process. Reduction of magnetite from the magnetite–hercynite solid solution practically stops when the Al³⁺ content at the interface approaches the solubility limit. Wüstite in the separated plates is reduced further to iron.     

冷热轧酸洗混合生产线氩弧焊机系统改造

某钢厂从20世纪90年代末引进的不锈钢冷热混合线机组自投产以来,由于焊机功能的不完善,所以需对其进行技术改造。机械部分改造了带双刃剪的机架、压板台等。电气控制部分主要是将新增设备的动作与旧有设备的动作按照逻辑关系结合,实现新增功能。介绍了该设备改造的技术方案及技术特点。     

Evaluation of the Explosion Hazard of Powders by the Maximum Explosion Pressure and Maximum Rate of Explosion Pressure Rise I. Explosion Expansion in Gas Suspensions

Powder Metallurgy and Metal Ceramics - The features of powder explosion propagation in closed equipment and equipment with explosion venting are considered. A near-proportional dependence of the...     

Radar Testing of a Masonry Composite Structure with Sand and Water Backfill

As part of an ongoing program into the noninvasive geometrical characterization of masonry arch bridges, a laboratory study of radar propagation through masonry has been undertaken. A 2.4 m long × 1 m wide × 1.5 m high experimental test rig was built in the laboratory with brick walls on three sides and a wooden gate on the fourth narrow side. The objective was to construct a composite test rig that would replicate certain of the environments that ground-penetrating radar might encounter when being used to test a masonry arch bridge. Tests were undertaken using 500, 900, and 1,000 MHz bow-tie antennas with the masonry box filled with fresh water and then saline water with different concentrations of sodium chloride. Further tests were undertaken with the masonry box filled with dry sand and wet sand. Finally the test rig was modified to simulate a composite masonry structure and tests were performed both on the hollow- and sand-filled models. The results from this work are reported herein indicating the reliability and ease of identifying various targets. It was found that radar signals were severely attenuated when the saline concentration exceeded 0.05% by mass. Better penetration of the radar signals was obtained when the masonry box was filled with dry sand rather than wet sand. In the case of the hollow cellular masonry structure, refraction effects were more evident.