Effect of Zirconium on Tensile Property,Microstructure and Fracture Behaviour of Cast Ni_3Al Based Alloy

ＥｆｅｃｔｏｆＺｉｒｃｏｎｉｕｍｏｎＴｅｎｓｉｌｅＰｒｏｐｅｒｔｙ，ＭｉｃｒｏｓｔｒｕｃｔｕｒｅａｎｄＦｒａｃｔｕｒｅＢｅｈａｖｉｏｕｒｏｆＣａｓｔＮｉ３ＡｌＢａｓｅｄＡｌｏｙＹｅＷｕｊｕｎ，ＦｅｎｇＤｉ，ＨａｎＧｕａｎｇｗｅｉ，ＬｕｏＨｅｌｉ①Ａ...     

Effect of Rare Earths on Tensile Behavior of Hot Roller Steel 60CrMnMo and Estimation of Roll's Fati

ＥｆｅｃｔｏｆＲａｒｅＥａｒｔｈｓｏｎＴｅｎｓｉｌｅＢｅｈａｖｉｏｒｏｆＨｏｔＲｏｌｅｒＳｔｅｌ６０ＣｒＭｎＭｏａｎｄＥｓｔｉｍａｔｉｏｎｏｆＲｏｌ′ｓＦａｔｉｇｕｅＬｉｆｅＹａｎｇＱｉｎｇｘｉａｎｇ（杨庆祥），ＺｈｕＧｕａｎｇｒｏｎｇ（朱广荣），...     

Effect of Carbon on Grain Boundary Segregation of Phosphorus and Phosphorus-Induced Intergranular Fracture in High Purity Iron with Phosphorus

Ａｓｗｅｌｌｋｎｏｗｎ ,ｔｈｅａｄｄｉｔｉｏｎｏｆｃａｒｂｏｎｃａｎｐｒｅ ｖｅｎｔｔｈｅｐｈｏｓｐｈｏｒｕｓ ｉｎｄｕｃｅｄｉｎｔｅｒｇｒａｎｕｌａｒｆａｉｌｕｒｅｉｎｉｒｏｎ .ＢｕｔｉｔｉｓｔｈｅｒｅｓｕｌｔｏｆｕｓｉｎｇＡＥＳ (Ａｕｇｅｒｅｌｅｃ ｔｒｏｎｓｐｅｃｔｒｏｓｃｏｐｙ)ａｎａｌｙｓｉｓｉｎｆｒａｃｔｕｒｅｄｓｕｒｆａｃｅａｎａｌ ｙｓｉｓ .ＥｒｈａｒｔＨｅｔａｌ[1] ,ｉｎｏｒｄｅｒｔｏｅｘｐｌａｉｎｔｈｅｍｅｃｈ ａｎｉｓｍｏｆｃａｒｂｏｎｓｕｐｐｒｅｓｓｉｎｇｔｈｅｉｎｔｅｒｇｒａ…     

Effect of Microstructure in TRIP Steel on Its Tensile Behavior at High Strain Rate

Ｔｈｅｓｔｕｄｉｅｓ[1,2 ] ｈａｖｅｓｔａｔｅｄｔｈａｔｒｅｔａｉｎｅｄａｕｓｔｅｎｉｔｅｉｎａｄｕａｌ ｐｈａｓｅｓｔｅｅｌｉｓｔｒａｎｓｆｏｒｍｅｄｔｏｍａｒｔｅｎｓｉｔｅｕｎｄｅｒｔｅｎｓｉｌｅｓｔｒａｉｎ .Ｓｕｃｈｓｔｒａｉｎ ｉｎｄｕｃｅｄｔｒａｎｓｆｏｒｍａｔｉｏｎｏｆｒｅｔａｉｎｅｄａｕｓｔｅｎｉｔｅｃａｎｅｎｈａｎｃｅｄｕｃｔｉｌｉｔｙｏｆｓｔｅｅｌｗｈｅｎｔｈｅｒｅｔａｉｎｅｄａｕｓｔｅｎｉｔｅｉｓｒａｔｈｅｒｓｔａｂｌｅａｇａｉｎｓｔｓｔｒａｉｎｉｎｇ[3 ] .Ｂａｓｅｄｏｎｔｈｉ…     

Effect of Temperature and Phase Constitution on Kinetics of La Diffusion

The diffusion of La inε－Fe2-3N(ε)andν′-Fe4N(ν′)phases produced by plasma nitriding was studied.It is found that with increasing nitriding time,theεphase continuously decomposes into ν′one under employed experimental condition and compared with ν′phase orε ν′ones,the mono oneεhas an impedient effect on depth of La diffusion,The growth of La layer in dual phases and mono one follows an approximate exponential law and a parabolic one ,respectively,and this kinetics law does not change with increasing temperature,The effect of increasing temperature in the range of 520to560℃on La diffusion depth is less than that of phase constitution change such as the decompostition ofεphase intoν′one.     

Effect of Thermo-mechanical Treatment on High Temperature Tensile Properties and Ductile–Brittle Transition Behavior of Modified 9Cr-1Mo Steel

Metallurgical and Materials Transactions A - In the present work, a modified 9Cr-1Mo steel is subjected to normalizing and tempering treatment with or without an intermediate rolling, which was...     

Effect of Impurities and Ce on the Anisotropic Behavior of 8090 Alloy Sheet

ＥｆｆｅｃｔｏｆＩｍｐｕｒｉｔｉｅｓａｎｄＣｅｏｎｔｈｅＡｎｉｓｏｔｒｏｐｉｃＢｅｈａｖｉｏｒｏｆ８０９０ＡｌｌｏｙＳｈｅｅｔ￥ＭｅｎｇＬｉａｎｇ；ＧｅｎｇＤｏｎｇｓｈｅｎｇ；ＺｈｅｎｇＸｉｕｌｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌＳｃｉｅｎ...     

748 K (475 °C) Embrittlement of Duplex Stainless Steel: Effect on Microstructure and Fracture Behavior

22Cr-5Ni duplex stainless steel (DSS) was aged at 748 K (475 °C) and the microstructure development correlated to changes in mechanical properties and fracture behavior. Tensile testing of aged microstructures confirmed the occurrence of 748 K (475 °C) embrittlement, which was accompanied by an increase of strength and hardness and loss of toughness. Aging caused spinodal decomposition of the ferrite phase, consisting of Cr-enriched α″ and Fe-rich α′ and the formation of a large number of R-phase precipitates, with sizes between 50 and 400 nm. Fracture surface analyses revealed a gradual change of the fracture mode from ductile to brittle delamination fracture, associated with slip incompatibility between ferrite and austenite. Ferrite became highly brittle after 255 hours of aging, mainly due to the presence of precipitates, while austenite was ductile and accommodated most plastic strain. The fracture mechanism as a function of 748 K (475 °C) embrittlement is discussed in light of microstructure development.     

Effect of Thermal Cycle on Microstructure and Fracture Morphology in HAZ of HQ130 Steel

ＥｆｆｅｃｔｏｆＴｈｅｒｍａｌＣｙｃｌｅｏｎＭｉｃｒｏｓｔｒｕｃｔｕｒｅａｎｄＦｒａｃｔｕｒｅＭｏｒｐｈｏｌｏｇｙｉｎＨＡＺｏｆＨＱ１３０ＳｔｅｅｌＬｉＹａｊｉａｎｇ；ＺｏｕＺｅｎｇｄａ；ＣｈｅｎｇＺｈｕｎｉａｎ；ＷｅｉＸｉｎｇ；ＪｉａｎｇＱｕａｎｃ...     

Cerium Effect on the Phase Composition and Crystallization Behavior of Aluminum Casting Alloys Based on the Al–Mg–Si System

Russian Journal of Non-Ferrous Metals - Using a Thermo-Calc software package (TCAl4.0 database), unexplored data concerning the phase composition and crystallization behavior of...     

Effect of Asymmetric Friction on Front end Curvature in Plate and Sheet Rolling Process

 In this paper a formula of calculating curvature radius was deduced according to the theory of rolling combining with the characteristic of rolling process; moreover, the simulation of producing process is represented. Simulating results indicate that the curvature radius could be diminished by increasing friction coefficient, friction coefficient ratio, reduction ratio or roller radius, while be augmented by increasing the thickness of plate. Furthermore, increasing the thickness of plate would cause more effects on front end curvature, whereas reducing ratio would do less. It provides theoretic gist to eliminate the front end curvature in plate and sheet rolling industry, and it is important to protect scene controlling equipment and increase forming ratio as well.     

Effect of Yttrium Addition on Microstructures and Room Temperature Tensile Properties of Ti-47Al Alloy

The microstructures and room temperature tensile properties of a series of Ti-47Al-xY （x = 0%, 0.1%, 0.3%, 0.5%, 0.7% and 1.0%（atom fraction）） were investigated systemically. Results show that both the grain size and lamellar spacing decrease remarkably with the increase of Y content. When the content of Y is greater than 0.1%, most of the Y elements accumulate along the grain boundaries and some fine particles are uniformly dispersed within the grains in the form of YAl2 compound because of the low solubility and segregation of Y in TiAl alloys. Grain-boundary seg- regation of Y element is more prominent with the increase of Y addition. Good tensile properties are obtained when Y addition ranges from 0.3 % to 0.5 %. The refinement of grain and lamellar structures and dispersion of YAl2 within the grains contribute to the improvement of tensile properties. On the other hand, for high Y-added alloys （over 0.5% Y）, tensile properties are obviously deteriorated due to brittle cleavage fracture of the coarse YAl2 network.     

Effect of Linear Electromagnetic Stirring on Behavior of Liquid Metal and Rate of Slag-Metal Interfacial Reactions

 Against the background of actual metallurgical equipment with linear electromagnetic stirring system，the study measures and analyzes the internal flow, the free surface shape and level fluctuation of liquid metal exposed to linear electromagnetic stirring with Doppler ultrasound velocimetry and laser liquid level apparatus respectively, and then desulphurization process with or without imposition of linear electromagnetic stirring is studied experimentally. The change of sulfur content of hot metal with respect to time is obtained, and the volume mass transfer coefficients corresponding to different stirring current is determined finally. The result shows that linear electromagnetic stirring can not only effectively promote the internal flow, but also effectively increase the level fluctuation so as to significantly improve the kinetic condition of liquid metal. The internal flow and level fluctuation of the liquid metal would increase in line with the increase of electromagnetic stirring intensity. The desulphurization experiments show that the linear electromagnetic stirring can significantly promote the desulphurization process of hot metal, and the technology has wide application prospect in promoting various slag-metal reaction.     

Effect of Cyclic Pre-deformation on Uniaxial Tensile Behavior of Cu-16 at. pct Al Alloy with Low Stacking Fault Energy

To explore the effect of cyclic pre-deformation on static mechanical behavior of materials with different stacking fault energies (SFEs), polycrystalline Cu-16 at. pct Al alloy with a low SFE is selected as the target material in the present work, and the strengthening micro-mechanisms induced by cyclic pre-deformation are compared with the previous studies on pure Al with a high SFE and Cu with an intermediate SFE. The results show that the movement of dislocations exhibits a high slip planarity during cyclic pre-deformation at different total strain amplitudes Δε _t/2, and some nano-sized deformation twins are formed after subsequent tension. The cyclic pre-deformation at an appropriate Δε _t/2 of 1.0 × 10^?3 promotes a significant increase in ultimate tensile strength σ _UTS nearly without loss of tensile ductility, which primarily stems from the introduction of many mobile planar slip dislocations by cyclic pre-deformation as well as the formation of nano-sized deformation twins during subsequent tension. Based on the comparison of the strengthening micro-mechanisms induced by cyclic pre-deformation in Al, Cu, and Cu-16 at. pct Al alloy, it is deduced that a low-cycle cyclic pre-deformation at an appropriate condition is expected to cause a better strengthening effect on the static tensile properties of low SFE metals.     

Effect of Cerium on Expression and Activity of MMP-9 from Human Carcinoma of Bladder Cell Line

Rareearthshaveledtowidespreadinterestsinlifescience ,whilethescientistsdoresearchesdeeplyinmedicalandbiochemicalfields .Rareearthsplaypotentialrolesininhibitingcancer ,andalargenum berofscientistsdedicatethemselvestoit[1] .Thema trixmetalloproteinases (MMPs)areafamilyofatleast1 7humanzinc dependentendopeptidasesthatareca pableofdegradingalmostallextracellularmatrix(ECM)components .Theyareessentialinmanyphys iologicalprocessesandseveralpathologicalconditions ,suchastumorprogression .MMPsare…     

Effect of Sub-rapid Solidification and Secondary Cooling on Microstructure and Properties of Strip Cast Low-Carbon Bainitic–Martensitic Steel

Metallurgical and Materials Transactions A - The low-carbon bainitic–martensitic steel added with microalloying elements was designed, and samples with different cooling rates were produced...     

Revealing the Role of Cerium on Precipitation Behavior of In Situ TiC Particles and Wear Resistance of High-Titanium Wear-Resistant Steels

Compared to conventional martensitic wear-resistant steels of the same hardness, high-titanium wear-resistant steels with in situ TiC particles can significantly improve wear resistance. However, micron-sized TiC particles will decrease the toughness of high-titanium wear-resistant steels. Here, in order to improve wear resistance without reducing impact toughness, we incorporate 0.0025% cerium elements into high-titanium wear-resistant steels. Compared with no cerium steel, the steel containing cerium is demonstrating comparable mechanical properties, with the yield strength of 1283 MPa and impact toughness of 35.6 J, and the wear performance of the steel containing cerium is 1.78 times that of the steel with no cerium. The results show that with the addition of cerium the effective grain size of the steel decreases, and yield strength and toughness increase. The addition of cerium can form intermetallic compounds of Ce₂O₂S, which are used as heterogeneous nuclear particles in TiC to form rare earth composite particles calculated by the 2D mismatch theoretical model of Bramfitt. As the average spacing of the reinforcing phase particles in the steel decreases, the effective grain size of the steel decreases, and the number of reinforcing phase particles increases, the wear resistance of the steel with the addition of cerium is optimized.     

Combined Effect of Calcium and Silicon on the Phase Composition and Structure of Al–10%Mg Alloy

Phase transformations in the Al–Ca–Mg–Si system in the region of aluminum–magnesium alloys are investigated using the Thermo-Calc program. The liquidus projection of the quaternary system is constructed with a Mg content of 10% and it is shown that phases Al4Ca, Mg₂Si, and Al₂CaSi₂ can crystallize (in addition to the aluminum solid solution (Al)) depending on the calcium and silicon concentrations. The crystallization character of quaternary alloys is investigated with the help of a polythermal cross section calculated at concentrations of 10% Mg and 84% Al. Based on the analysis of phase transformations occurring in alloys of this section, the presence of the Al–Al₂CaSi₂–Mg₂Si quasi-ternary section in the Al–Ca–Mg–Si system was assumed. Three experimental alloys were considered from a quantitative analysis of the phase composition, notably, Al–10% Ca–10% Mg–2% Si, Al–4% Ca–10% Mg–2% Si, and Al–3% Ca–10% Mg–1% Si. Metallographic investigations and electron-probe microanalysis were performed using a TESCAN Vega 3 scanning electron microscope. Critical temperatures are determined using a DSC Setaram Setsys Evolution differential calorimeter. The experimental results agree well with the calculated data; in particular, a peak at t ~ 450°C is revealed for all alloys in curves of the nonequilibrium solidus and invariant eutectic reaction L → (Al) + Al₄Ca + Mg₂Si + Al₃Mg₂. It is established that the structure of the Al–3% Ca–10% Mg–1% Si alloy is closest to the eutectic alloy. It is no worse that the AMg10 alloy in regards to density and corrosion resistance and even surpasses it in hardness, which allows us to consider this alloy as the basis for the development of a new cast material: “natural composites.”     

Effect of Electrodeposition Current and Pulse Parameter on Surface Mechanical and Electrochemical Behavior of Ni–W Alloy Coatings

Metallurgical and Materials Transactions A - Ni–W alloy coatings have various applications because they are capable of replacing hard chromium coatings due to their corrosion, oxidation,...