Materials for Mechanical Engineering 

About: Materials for Mechanical Engineering is an academic journal. The journal publishes majorly in the area(s): Microstructure & Alloy. Over the lifetime, 585 publications have been published receiving 969 citations.

Electroless Ni-P-SiC Composite Coatings with Superfine Particles

Abstract: Superfine silicon carbide particles reinforced nickel-phosphorus(Ni-P)matrix composite coatings were prepared by electroless depositionThe morphology and structure as well as the phase transformation of the composite coatings were studied by SEM,XRD,TEM and DSCIt is shown that SiC particles co-deposited homogeneously,and the structure of Ni-P-SiC composite coatings as deposited was amorphousAfter certain heat treatment,the matrix of composite coatings crystallized into nickel crystal and nickel phosphideAt higher temperature,nickel reacted with SiC and generated nickel silicides accompanied by free carbonFinal products of Ni- P-SiC coating after completely heat treatment were consisted of Ni,Ni_3P,Ni_3Si and carbonThe finer the SiC particles in composite coating,the lower the temperature for the reaction to take place

Effects of Forging Process and Following Heat Treatment on Microstructure and Mechanical Properties of TC11 Titanium Alloy

Abstract: The effects of conventional forging,special forging and following heat treatment on microstructure and mechanical properties of TC11 titanium alloy were analyzed.The results show boasketweave microstructure could be obtained after TC11 titanium alloys were forged by special forging at 950℃,and the mechanical properties of as-forged and as-heat-treated titaniun alloy were better than conventional forging(equiaxed microstructure).For the two kinds forging,the mechanical properties of titanium alloy forged at 950℃were better than that of at 980℃(equiaxed microstructure);Knitting structure which was obtained by special forging at 950℃combined with high temperature hormogenizing teratiment and double annealing treatment showed good combination of strength and plasticity.

Micro-residual Stress Measurement Using Vickers Micro-indentation

Abstract: The measurement of the value and distribution for micro-residual stress in materials was crucial and difficult for micro-fracture theory.A regular Vickers micro-indentation for evaluating the micro-residual stress in micron-range was introduced.Three common metals including mild steel,copper and aluminum alloy were used in the experiment,and residual stresses were induced "in-situ" by using three-point bending.The results show that the present measurement is accurate.

Tool Materials for High Speed Machining and Their Fabrication Technologies

Abstract: High-speed machining (HSM) is one of the emerging cutting processes, which is machining at a speed significantly higher than the speed commonly in use on the shop floor. High speed machining has received an important attention as a technological solution for high productivity to increase economic efficiency in manufacturing. The recent developments in tool materials at high speed machining operations, which include PCD, PCBN, ceramics, cermets, and coated tools, are reviewed The properties, application ranges and prospective developments of tool materials in high speed machining are presented. Fabrication technologies for coated tools, fine grain cemented carbide and high-speed steel tools are also discussed. The presentation is very great beneficial to the wide applications of high speed machining.

Theoretical Analysis of the Relationship between Elastic Constants of Metals and Temperatures

Abstract: The analytical expressions and approximation expansion in series of the coefficient of linear expansion versus a wide range of temperature for carbon steel and pressure vessel steels were deduced based on the continum mechanics,mechanical properties of metals and microscopic theory of solid physics.A concept and definition of transition temperature Tcof linear expansion coefficient was firstly proposed.when the temperature was lower than Tc,the linear expansion coefficient increased with the increace of temperature,When lower than Tc it decreased with the increase of temperature.From a view of atomic theory of solid physics,the relationship between elastic modulus and temperature was deduced including the crystal dislocation resulted from the plastic deformations induced by thermal activation energy at high temperatures.The universal function expression for elastic modulus vs temperature for carbon steel and pressure vessel steels was obtained.The computed results by the above-mentioned formula agreed well with the experimental data.