A Mechanism for Carbon Depletion at Bondline of High-Frequency Electric-Resistance-Welded X70 Pipeline Steel

Metallurgical and Materials Transactions A - The bondline of electric-resistance-welded (ERW) linepipe steel, often etched white (i.e., ferrite) in optical microscopy, is generally believed to be...     

Effect of Volumetric Energy Density on Microstructure and Properties of Grade 300 Maraging Steel Fabricated by Laser Powder Bed Fusion

Metallurgical and Materials Transactions A - This study investigated the effect of laser powder bed fusion process parameters on the microstructure and properties of maraging steel. The results...     

Identification of Inverse Bainite in Fe-0.84C-1Cr-1Mn Hypereutectoid Low Alloy Steel

A unique dilatation trend is observed for isothermal bainite transformation in Fe-0.84 pct C-1 pct Cr-1 pct Mn steel. The dilatation is found to occur in two stages with volumetric contraction dominating the first stage, followed by volumetric expansion dominating the second stage. Through electron microscopic characterization, bainitic microstructure is identified as inverse bainite with cementite (Fe₃C) nucleating first from supersaturated austenite followed by the transformation of ferrite and secondary carbides (Fe₃C, Fe₂C, and Fe₅C₂) from carbon-depleted austenite.     

Homogenisation of austenite during non-equilibrium heating in hypereutectoid steels

The homogenisation (Stage III) of austenite during non-equilibrium heating of hypereutectoid steels has been characterised for the first time through dilatometric strain measurements and electron microscopic techniques. It has been found that the homogenisation temperature (A_ch) is significantly higher than the cementite dissolution temperature (A_cm). Though there is a complete conversion of low-temperature constituents to austenite above the A_cm, a significant segregation of carbon in the austenite is observed below the A_ch. Performing heat treatment with an incomplete austenitisation between the A_cm and the A_ch temperature can affect the subsequent on-cooling phase transformations. It is proposed that the A_ch temperature should be used as the full austenitisation temperature in hypereutectoid steels.     

Correlation Between Intercritical Heat-Affected Zone and Type IV Creep Damage Zone in Grade 91 Steel

Metallurgical and Materials Transactions A - A soft zone in Cr-Mo steel weldments has been reported to accompany the infamous Type IV cracking, the highly localized creep damage in the...     

Effect of Zr Microalloying on Austenite Grain Size of Low-Carbon Steels

Metallurgical and Materials Transactions B - The effect of microalloying addition of Zr on the characteristics of inclusions and prior austenite grain sizes following a quench heat treatment has...     

Thermodynamics and kinetics of precipitation and austenite reversion during aging of Ti-free grade 300 maraging steel manufactured by laser powder bed fusion (LPBF)

Journal of Materials Science - Austenite reversion and intermetallic precipitation are two key phase transformations in maraging steels which determine the strength and ductility. Usually, an...     

Temperature-Dependent Thermal and Mechanical Properties of a Wire Arc Additively Manufactured Low Transformation Temperature Steel

Metallurgical and Materials Transactions A - Recent research has studied the use of low transformation temperature (LTT) martensite steel as feedstock for wire arc additive manufacturing (WAAM) and...     

FPGA网络存储器解决方案

引言过去几年里，人们通过因特网进行数据交换变得越来越流行，仅去年全球通过因特网交换的电子邮件就达到了6．9万亿封。但是在不远的将来，电子邮件和数据文件等应用将会仅占到因特网应用的一部分，更复杂和更广泛的应用将会快速出现。需要更高带宽的多媒体应用(如视频)或低延迟应用(如话音)正被广泛部署。同时，通过虚拟专用网络