The metallographic specimens of heat-resistant steel girth weld were prepared by cutting, inlaying, grinding, polishing and corrosion. The heat-affected zone, weld zone and base metal zone were observed and analyzed respectively. The results show that the structure of HAZ shows obvious coarse grains, and there exists Widmanstatten structure composed of cementite and pearlite in the superheated zone, and segregation occurs, which needs to be eliminated by post-weld heat treatment. Then the hardness of welds in different regions was tested by microhardness testing method. The results show that the micro hardness of different weld areas shows obvious difference.
Paper No:
2510
