Effect of boron on G115 martensitic heat resistant steel during aging at 650 °C

Microstructure and strength evolution of the G115 steels with different B content aging at 650 °C for 5000 h were investigated in this research. The results showed that properly increasing B content in steels would reduce the coarsening rate of M23C6 carbides and martensitic laths, slow down the reduction rate of dislocation density, and decelerate the evolution of microstructure. Phase analysis and electron probe micro-analyzer (EPMA) studies...