The flow behavior and microstructure change of the Ti-55511 alloy are investigated by thermal compression experiments with stepped strain rates. phase transformation features, dynamic recrystallization (DRX) β matrix, spheroidization mechanism lamellar α evolution sub-grain size quantitatively analyzed. A unified constitutive model is constructed to characterize hot deformation features alloy. In established model, work hardening effect taken into account involving coupled effects equiaxed...

The effect of hot deformation plus aging treatment on the microhardness a solid solution TC18 titanium alloy is investigated. First, microstructure evolution during and stages analyzed. Additionally, influence parameters evolutions aged further studied. After treatment, exhibits trimodal microstructure, which contributes to its excellent mechanical performance. Aging significantly refines also influenced by parameters. variations at different are subsequently analyzed how conditions affect...

Petroleum has played a vital role as the major supplier of materials and energy during evolution human civilization. Given change in demand for from high to low carbon ultimately net zero carbon, framework undergone revolutionary changes. The attribute petroleum will be gradually weakened, while material CO2 emission attributes strengthened. Thus, petrochemical processing basis, scientific concepts, ideas undergo adjustments reshape industry. Hence, it is necessary reconsider industry...

Abstract Composite alginate microspheres were synthesized via a modified emulsification technique and characterized by inverted optical microscope, transmission electron ζ‐potential analyzer, UV–vis spectrophotometer, luminescence spectrometer, vibrating sample magnetometer. The results show that the synthetic parameters including weight ratio of maghemite nanoparticles to alginate, hydrophile‐lipophile balance (HLB) value, stirring speed, CaCl 2 dripping rate play important roles in...

The hollow axle is the key basic component of high-speed trains. How to realize its production with short process and high-quality precision plastic forming frontier current research a major problem be solved. On basis analyzing advantages disadvantages existing forging axle, this paper expounds principles characteristics multi-wedge synchrostep cross-wedge rolling (MSCWR) technology, multi-roll (MCWR) three-roll skew (TRSR) tandem flexible (TFSR) technology in detail, discusses feasibility...

Abstract The uniform thickness hollow axle is one of the lightest weight axles in high-speed rail industry. It can effectively reduce unsprung mass and further improve train speed. Therefore, due to its importance significance, it crucial research develop axle. To understand microstructural evolution during three-roll skew-rolling (TRSR) forming, 30CrMoA alloy steel was used this study. A constitutive model established by SIMUFACT FORMING finite element software utilized simulate...

In this paper, the hot tensile deformation of a GH3230 superalloy double-sheet was conducted under temperatures ranging from 1123~1273 K and strain rates 0.001~0.2 s−1. The flow behavior analyzed in detail. process includes four stages elastic deformation, hardening, steady state fracture. true stress decreases with increasing temperature decreasing rate. variation rate sensitivity index hardening processing parameters were discussed. average apparent activation energy for is 408.53 ± 46.96...

The defects such as voids and debonding within the bonding interface between composite substrate are key factors affecting safe use of materials. In this study, Industrial Computed Tomography (ICT) was used to perform non-destructive tests defects. High-precision characterization methods required quantify This paper proposes an improved image segmentation processing method for accurate extraction defect edges quantitative characterization. With proposed combining mathematical morphology...

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Abstract This study primarily focuses on examining the microstructural evolution during integrated manufacturing process of 42CrMo large-scale flange nut blanks, utilizing a three-roll skew rolling and piercing technique. Through secondary development, we have constitutive models into our analysis. Utilizing numerical simulation, this research delves temperature variation throughout each stage forming facilitated by piercing. The meticulously examines various stages workpiece to uncover...

According to the current legal metrological regulation of diaphragm gas meter, domestic meters in China are required pass mandatory initial verification at 20°C, and then a 10 years' duration is allowed without any subsequent or in-service verifications. Here, experimental study has been implemented investigate performance temperature adaptability old with different use age. Through introduction weighting factors, weighted mean errors calculated analyse correlation between indication their...

To investigate the effect of sliding speed and electrical current on currentcarrying friction wear performance carbon brushes with different hardnesses. In this paper, two carbon-graphite material samples (CG1 low hardness CG2 high hardness) manufactured by a powder metallurgical process were prepared for testing current-carrying pin-disc tester. The results showed that temperature rise contact resistance CG1 lower than those CG2, showsed good adaptability to changes. Then, mechanisms both...

摘要: 西藏谷露地热田于2020年成功揭露到189.2 ℃的高温地热资源，研究谷露地热田地热地质特征，对西藏地热资源勘查开发和揭示高温地热系统成因机理都具有重要的科学与指导意义.本文以构造地质调查为基础，结合最新物探、钻探、水文资料，通过解析构造‒水‒热循环系统内在联系，总结构造控热规律，并建立了谷露地热田地热系统概念模型.谷露地热田内主要发育N-S向（F1、F3）、E-W向（F2、F4）和NE向3组断裂.大气降水与冰山融水沿盆地西侧九子拉‒桑雄断裂下渗，经深循环加热以盆地西缘F1断裂为导热通道向上运移，由于受到南北两侧F2、F4断裂的阻隔作用，热水在F1和F3断裂组成的“Y”字型断裂系统内汇聚集中，形成热储，并在地表沿NE向和N-S向断裂构成的通道系统中运移排泄；盆地基底花岗岩之上覆盖的泉胶砾岩层对热储起到了良好的隔水保温作用；热田内第四系沉积很薄，热储主要赋存于基岩裂隙中，为基岩裂隙型热储.F1与F3构成的“Y”字型断裂系统是热储赋存的主要场所，谷露地热田地热资源勘查开发要以这两条断裂为重点勘查目标. 关键词: 谷露 / 地热田 地热发电 概念模型 基岩裂隙型热储