Fatigue crack growth behavior of the simulated HAZ of 800Â MPa grade high-performance steel

▶ Fatigue crack resistances of HSB800 base steel and HAZs: Base steel > FGHAZ > CGHAZ > ICCGHAZ. ▶ In the case of ICCGHAZ, fatigue cracks are rapidly initiated and propagated through massive M-A constituents. ▶ Fatigue crack growth rate of CGHAZ was faster than that of FGHAZ, mainly due to the coarsened prior austenite grain and martensite packet.