A5066092280- Microstructure and Mechanical Properties of Steels
- Metal Alloys Wear and Properties
- Titanium Alloys Microstructure and Properties
- Surface Treatment and Residual Stress
- Air Quality and Health Impacts
- Shape Memory Alloy Transformations
- Welding Techniques and Residual Stresses
- Vehicle emissions and performance
- High Entropy Alloys Studies
- Microstructure and mechanical properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Material Properties and Failure Mechanisms
- Urban Transport and Accessibility
Northeastern University
2019-2020
Mechanically strong and ductile load–carrying materials are needed in all sectors, from transportation to lightweight design safe infrastructure. Yet, a grand challenge is unify both features one material. We show that plain medium-manganese steel can be processed have tensile strength >2.2 gigapascals at uniform elongation >20%. This requires combination of multiple transversal forging, cryogenic treatment, tempering steps. A hierarchical microstructure consists laminated twofold...
Introduction The rapid urbanization and industrialization, accompanied by high-intensive population, energy consumption transportation activities, have made air pollution an intractable environmental issue in China, especially most megacities. This study identified the primary pollutant (PAP) of a Chinese megacity—Chengdu, analyzed spatiotemporal changes PAP concentrations. Methods LMDI GWR models were employed to probe drivers Chengdu. Results discussion pollutants PM 10 , 2.5 O 3 NO 2 as...
A novel steel combining the “quenching and tempering (Q&T)” process was exploited that can achieve enhancement of austenite by interface migration during martensitic matrix mixed with films austenite. high uniform elongation (12%) combined yield tensile strength (1500 MPa) obtained, which showed distinct advantages over all other advanced steels under development for a lightweight car body. Furthermore, effect on ductility in “Q&T” martensite elucidated, suggested promoted enhancing...
In addition to manganese, carbon partitioning has been proposed in a new medium Mn-TRIP steel by two-step during the first batching annealing and final continuous annealing. second-step partitioning, cementite dissolves blocky austenite forms with enrichment, while partition of manganese is negligible from prior lath back into ferrite due short duration. The combined improves both fraction stability retained austenite. alloy exhibited product strength elongation approximately 50 GPa%. It...
Abstract We present here an analysis on omega transition process during martensitic transformation. Martensitic transformation occurred deformation at room temperature, avoiding the influence of auto-tempering metastable phase. Based crystallographic relationships twinned crystals, twin interface martensite was characterized by considering effect direction incidence electron beam diffraction patterns through pole figures. Omega phase only existed boundaries with single variant. It proposed...