Microstructure-dependent hydrogen diffusion and trapping in high-tensile steel

摘要: Abstract In this work, the hydrogen embrittlement (HE) characteristics of high-tensile steel sheets with different microstructural were investigated. The fabricated via cold rolling (CR), water quenching (WQ), baking hardening (BH), and low-temperature annealing (LT), their HE clarified by examining relationships between severity HE. Severe occurred in WQ sample trapping at boundaries retained austenite phases, resulting intergranular cleavage-like brittle failure. A reduction was realized after BH LT processes. these cases, divided e-carbide lattice spacings austenite, a mixed ductile/brittle failure mode. extent CR similar to those samples. However, sites different; slip band around dislocations, delamination-like on planes. also affected strain rate. More severe both samples loaded slowly 0.01 mm min−1 compared 1.0 mm min−1 (i.e., failure). case, large amount atoms trapped phases. structure migrated dislocation movement. deterioration tensile strength two times higher speed 0.01 mm min−1. Finally, mechanisms nano atomic scales discussed based results analyses.