s moeinfar - sharif university
a.h kokabi
h.r.m hosseini
c.j shang

the influence of real and simulated thermal cycles with secondary peak temperatures on the properties and microstructure of the reheated coarse grained heat affected zone CGHAZ in X80 high -strength low -alloy HSLA steel has been investigated. Four wires tandem submerged arc welding TSAW process with different heat input was used to generate real double passes thermal cycles the simulated cycles involved heating ti the first peak temperature Tp1 of 1400 C and then reheating to different secondary peak temperatures Tp2 of 700,800 and 900 C with cooling rates of 3.75 and 2 C/S the toughness of the simulated reheated CGHAZ was assessed using charpy impact testing at 0 and -50 C the microstructure and microhardness of the real and simulated specimens were investigated.

X80hsla STEEL ,TSAW,charpy impact ,reheated CGHAZ,microhardness