Effect of Nickel Alloying and Mechanical Stirring on the Microstructure and Mechanical Properties of Al – 10% Si – 5% Cu Alloy

Metal Science and Heat Treatment - The effect of nickel additions on the microstructure and ultimate tensile strength of alloy Al – 10% Si – 5% Cu in cast and heat treated conditions is...     

Effect of Annealing Temperature on the Microstructure and Mechanical Properties of Selective Laser Melted Alloy Ti – 6% Al – 4% V

Metal Science and Heat Treatment - The effect of annealing at 700, 800, 900 and 1000°C on the microstructure and mechanical properties of alloy Ti – 6% Al – 4% V obtained by...     

Effect of Double Austenitization on the Microstructure and Hardness of High-Carbon Steel 1.4% C – 11.7% Cr

Metal Science and Heat Treatment - The effects of single and double austenitization at 900, 590, 1000 and 1050°C on the microstructure and hardness of quenched and tempered steel 1.4% C...     

Cr22Ni13Mn5Mo2N奥氏体不锈钢的热轧工艺

运用Gleeble-3800热模拟试验机研究了00Cr22Ni13Mn5Mo2N奥氏体不锈钢在变形温度为1000～1200 ℃,变形量为50%、60%、70%,应变速率为0.05 s^-1条件下的热压缩变形行为,并观察分析变形后试样组织形貌和经1080 ℃固溶热处理后试样的组织形貌。观察试样固溶热处理前后的组织形貌得到在1000~1150 ℃下进行热压缩变形,随着变形量的增加,动态再结晶越完全;经过固溶热处理后,静态再结晶就越充分。但在1200 ℃时,温度过高,再结晶已完成并且晶粒发生长大。在变形量分别为50%、60%和70%时,随着变形温度的升高,再结晶越完全,经固溶热处理后,再结晶更完全。00Cr22Ni13Mn5Mo2N奥氏体不锈钢热轧最佳轧制温度为1100 ℃,压缩变形量为70%。     

Effect of Detonation-Sprayed Cr3C2 and Ni – Cr Coatings on Performance Properties of Gray Cast Iron Gears

Metal Science and Heat Treatment - The microstructure, hardness and wear resistance of gray cast iron with detonation-sprayed Cr3C2 and Ni – Cr coatings are studied. It is shown that the...     

Effect of Heat Treatment on Microstructure and Mechanical Properties of Alloy Mg – 10% Gd – 3% Y – 0.6% Zr

Metal Science and Heat Treatment - The microstructure, mechanical properties and fracture behavior of magnesium alloy Mg – 10% Gd – 3% Y – 0.6% Zr is studied in cast condition and...     

Microstructure and Mechanical Properties of Composite Materials Based on the Al – Si – Mg System Reinforced with SiC Particles and Obtained by Pressure Crystallization

Metal Science and Heat Treatment - Composite materials based on aluminum alloy Al – 9% Si – 0.6% Mg are obtained by stirring ceramic particles of silicon carbide into the melt and...     

Effect of Nb and Mo on the Microstructure,Mechanical Properties and Ductility-Dip Cracking of Ni–Cr–Fe Weld Metals

A series of Ni–Cr–Fe welding wires with different Nb and Mo contents were designed to investigate the effect of Nb and Mo on the microstructure, mechanical properties and the ductility-dip cracking susceptibility of the weld metals by optical microscopy(OM), scanning electron microscopy, X-ray diffraction as well as the tensile and impact tests. Results showed that large Laves phases formed and distributed along the interdendritic regions with high Nb or Mo addition. The Cr-carbide(M_(23)C_6) was suppressed to precipitate at the grain boundaries with high Nb addition. Tensile testing indicates that the ultimate strength of weld metals increases with Nb or Mo addition. However, the voids formed easily around the large Laves phases in the interdendritic area during tensile testing for the weld metal with high Mo content. It is found that the tensile fractographs of high Mo weld metals show a typical feature of interdendritic fracture. The high Nb or Mo addition, which leads to the formation of large Laves phases, exposes a great weakening effect on the impact toughness of weld metals. In addition, the ductility-dip cracking was not found by OM in the selected cross sections of weld metals with different Nb additions. High Nb addition can eliminate the ductility-dip cracking from the Ni–Cr–Fe weld metals effectively.     

00Cr22Ni13Mn5Mo2N奥氏体不锈钢的精轧工艺

为了研究00Cr22Ni13Mn5Mo2N奥氏体不锈钢的精轧工艺,使用Gleeble-3800热模拟试验机模拟00Cr22Ni13Mn5Mo2N奥氏体不锈钢在变形温度为800、850、900、950 ℃,变形量为40%、50%、60%,应变速率为50 s^-1条件下的热压缩变形行为,并对其进行1080、1120、1160 ℃的固溶热处理,观察固溶热处理前后的组织形貌。结果表明:在800~950 ℃热压缩温度下,随变形量增大,再结晶越完全,再结晶平均晶粒尺寸越细小;经固溶处理1 h后,静态再结晶就越充分。在40%~60%变形量下,随热压缩温度升高,再结晶越完全,再结晶平均晶粒尺寸越大。热压缩变形试验钢随固溶处理温度升高,再结晶平均晶粒尺寸越大。00Cr22Ni13Mn5Mo2N奥氏体不锈钢的精轧最佳轧制温度为800 ℃,压缩变形量为60%,固溶温度为1080 ℃。     

Effect of Modes of Spark Plasma Sintering on the Structure and Properties of Materials of the Ni – Cr – Si – B – C System

Metal Science and Heat Treatment - The influence of modes of spark plasma sintering (SPS) on the structure and properties of a self-fluxing powder material of the Ni – Cr – Si – B...     

Effect of Casting Method on Phase Composition of Heat-Resistant Austenitic Alloys Based on the Fe – 25% Cr – 35% Ni System

Metal Science and Heat Treatment - Methods of optical and electron microscopy and x-ray spectrum microanalysis are used to study the microstructure and the phase composition of alloy HP40NbTi...     

Effect of Mn Addition on Microstructural Changes and Mechanical Properties of Ti–5Al–2.5Fe Alloys

Metals and Materials International - The microstructures and mechanical properties were investigated in newly developed Ti–5Al–2.5Fe and Ti–5Al–2.5Fe–2Mn alloys, which...     

Effect of Radial Shear Rolling on the Structure and Mechanical Properties of a New-Generation High-Strength Aluminum Alloy Based on the Al – Zn – Mg – Ni – Fe System

Metal Science and Heat Treatment - A high-strength aluminum alloy based on the Al – Zn – Mg – Ni – Fe system is studied in deformed condition after radial shear rolling with...     

Effect of Heat Input on Microstructure and Mechanical Properties of Joints Made by Bypass-Current MIG Welding–Brazing of Magnesium Alloy to Galvanized Steel

Experiments were carried out with bypass-current MIG welding–brazing of magnesium alloy to galvanized steel to investigate the effect of heat input on the microstructure and mechanical properties of lap joints. Experimental results indicated that the joint efficiency tended to increase at first and then to reduce with the increase of heat input. The joint efficiency reached its maximum of about 70% when the heat input was 155 J/mm. The metallurgical bonding between magnesium alloy and steel was a thin continuous reaction layer, and the intermetallic compound layer consisted of Mg–Zn and slight Fe–Al phases. It is concluded that bypass-current MIG welding–brazing is a stable welding process, which can be used to achieve defect-free joining of magnesium alloy to steel with good weld appearances.     

Effect of Cooling Rate on Microstructure and Effective Grain Size for a Ni–Cr–Mo–B High-Strength Steel

The effect of cooling rate on microstructure and effective grain size(EGS) of a Ni-Cr-Mo-B high-strength steel has been studied by dilatometer,field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM) and electron backscattered diffraction(EBSD).The results show that the microstructure of the Ni-Cr-Mo-B steel is dependent on cooling rate in the following sequence:lath martensite(LM),mixed LM and lath bainite(LB),mixed LB and granular bainite(GB) and GB.The critical...