The rapid development of train transportation toward higher speed and heavier load requires superior wheel materials with high strength toughness. Herein, a 20Mn2SiNiMo bainitic steel is developed wheels are produced. quenching tempering process studied considering the ferrite content stability retained austenite (RA). includes water spraying air cooling. Proeutectoid can be suppressed during water‐spraying process. During cooling, transformation promoted RA improved extension cooling time....

This paper investigates the effect of high-current pulsed electron beam (HCPEB) surface treatment with two, five, and eight pulses on Al-15Al2O3-0.3G prepared by powder metallurgy. The results show that presence graphene during HCPEB irradiation effectively controls extension microcracks. hardness samples increased 66.56% wear rate decreased 68.98% after eight-pulse treatment. increase in is attributed to uniform dispersion hard particles, fine grain strengthening, dislocation amorphous...

This study developed a robust bionic jellyfish-carbonic anhydrase complex (Bj-CA) for CO 2 efficient capture.

Thermal damage is one of the principle modes wagon railway wheels. A new bainitic wheel steel with high thermal resistance and good combination strength, plasticity, toughness was developed. Microstructure mechanical properties steels in a tempered condition at different temperatures were examined. Microstructures observed using scanning electron microscope transmission microscope. Mechanical evaluated by tensile, hardness, Charpy impact tests simultaneous comparison to pearlitic steel. The...

3D woven fabric has great application potential in military armor systems. Here we report numerical simulation of 3 D angle interlock fabric(3DAWF) subjected to the ballistic impact using LS-DYNA. We employed membrane elements construct mesoscale yarn-level 3DAWF model improve computational efficiencies and accuracy. The simplified Johnson-Cook (SJC) material was proposed for simulating yarns' dynamic behaviors under high-speed loadings. SJC commonly used strain-rate dependent Cowper-Symonds...

A novel aspect of combining bainitic austempering with quenching and the partitioning process is addressed herein to obtain a favorable microstructure desired mechanical properties. In this regard, Mn–Si–Cr–Al steel first intercritically annealed at 840 °C quenched 140 after isothermal treatment 360 for 15 min then partitioned 30 min. Multiphase containing ferrite, bainite, martensite, retained austenite (RA) obtained. Uniform elongation total increase appreciably from 11.5% 20.5% 21.0%...

Exploring possible ways to accelerate bainite transformation kinetics and enhance mechanical properties, especially for large‐scale parts, attracted much attention both in industrial manufacturing fundamental research. Herein, prior continuous cooling transformed is introduced promote isothermal improve strength toughness matching of railway wheel steel. Phase study by dilatometer indicates that the time–temperature–transformation curves tested steel swing back at lower temperature. This...

Abstract In this report, 20MnCr5 gear is characterized and analyzed under two carburizing heat treatment processes by optical microscope (OM) analysis, scanning electron (SEM) X-ray diffraction (XRD) Vickers hardness test. Results show that spherical angular carbides can be obtained a high concentration process for gear. Reheating subsequent low-temperature tempering help refine the grains of infiltration layer, reduce residual austenite content in permeable increase thickness effective...

Abstract To quantify the influence of coarse spontaneous-combustion coal gangue aggregate (SCGA) replacement ratio ( r c ) on compressive strength concrete, we reveal deterioration mechanism performance concrete (SCGAC). 5 groups SCGAC with different ratios were designed to measure by test, and structures was acquired Scanning Electron Microscope. Data that as rises, there is a corresponding decrease in SCGAC. Compared natural (NAC), 28 d axial 50% 100% decreases 14.61% 19.40%, respectively....

According to the factual demand of produce, some corporation wants enlarge capacity idle from 65t 75t. This paper aims at changing ladle which is It makes research iron ladle's promotion process and stress analysis. uses ANSYS-Workbench software make finite element analysis extracts largest stress, strain location. Then this analyses whether can be fit for intensity or not so that it could provide important theory gist

In this paper, we have studied the influence of deformation on microstructure and mechanical properties 20Mn2SiCrNi bainitic high strength steel processed through a hot rolling route. Simulation different temperatures degrees was carried out via Gleeble-1500. The study suggested that grain size is refined when at lower temperature (> Ac3). When degree increased from 20% to 60%, were both retained austenite reduced. tensile 1345 MPa 1432 MPa. impact toughness 115 J/cm2 210 room...

This paper investigates the effect of high current pulsed electron beam (HCPEB) surface treatment with 2,5 and 8 pulses on Al-15Al2O3-0.3G prepared by powder metallurgy. The results show that presence graphene during HCPEB irradiation effectively controls extension microcracks. hardness samples increased 66.56% wear rate decreased 68.98% after 8-pulse-HCPEB . increase in is attributed to uniform dispersion hard particles, fine grain strengthening, dislocation amorphous structure formation...

The iron ladle is a kind of large metallurgy equipments and used for collecting carrying water. According to the factual demand produce, some corporation wanted enlarge capacity idle from 65t 75t only by increasing height ladle. This paper aimed at changing which built up its 3D numerical model. constant water capacity, it method modeling find angle taphole made sure couldn't overturn automatically studying process overturning. Then this worked out overturning moment so that could provide...

Thermal deformation characteristics, dynamic recrystallization behavior, and processing map of 25Mn2Si2Cr high strength bainitic steels are elucidated during wide temperature range (850–1100 °C) strain rate (0.1–10 s −1 ) from flow behavior. Thermomechanical analysis by Thermo‐Calc software indicates that microstructure thermal is austenite, which conducive to recrystallization. Phenomenological constitutive equations deformation, equation, established predict The experimental results...