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Meeting MS&T23: Materials Science & Technology
Symposium Steels for Sustainable Development II
Presentation Title The Relationship Between Microstructure and Mechanical Properties in the Coarse-grain Heat-affected Zone of Line Pipe Steels
Author(s) Sabyasachi Roy, Matthias Militzer, Warren J. Poole
On-Site Speaker (Planned) Matthias Militzer
Abstract Scope Welding of steel changes the microstructure in the heat-affected zone (HAZ). The coarse-grain HAZ (CGHAZ) is closest to the weld pool and is critical to the integrity of the welded structures, e.g. pipelines. The present work examined the microstructure and tensile properties from laboratory-simulated CGHAZ samples obtained at different cooling rates, for seven line pipe steels. The microstructures were quantified based on the density of high-angle grain boundaries (HAGBs) evaluated using electron backscattered diffraction. Furthermore, Charpy impact toughness and ductile to brittle transition temperatures were measured for a range of HAGB densities, and then linked to the microstructure. It was observed that an increase in the cooling rate for a given steel results in (1) a larger density of HAGBs and (2) an increase in tensile strength. A Hall–Petch–type relationship is proposed to link the yield strength with the HAGB density.


Coating-free Press Hardening Steels with Low Carbon Footprint
Effect of Strength on Fracture Toughness of Line Pipe Steel Under High Pressure Hydrogen Environment
Effects of Enriched Copper Content on the Welding Behavior of Scrap-based Low Carbon Steels
Enabling the Design of Industrial Heat Treatments with Induction-coupled Thermomagnetic Processing Using Multiscale Modeling and Simulation
G-11: Effect of Cooling Rate and Tempering Temperature on Hydrogen Embrittlement of Tempered Martensitic Steel for High-pressure Hydrogen Storage
Investigation of Microstructure and Fracture Performance of 9 wt.% Nickel Steel for Application Laser Arc Hybrid Welding
Microstructural Engineering and Accelerated Test Method Development to Achieve Low Cost, High Performance Solutions for Hydrogen Storage and Delivery
Mitigating Cu-induced Hot-shortness in Recycled Steel Products through Thermomechanical Processing
Simulation of Accelerated Cooling of Thick Steel Products
The Relationship Between Microstructure and Mechanical Properties in the Coarse-grain Heat-affected Zone of Line Pipe Steels

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