Abstract
The effect of energy input of welding thermal cycles with different t_(8/5) on the cryogenic toughness of the coarse-grained heat-affected zones(CGHAZs) in steel 9Ni was invested. The CGHAZ specimens for different energy input welding thermal cycles were prepared by GLEEBLE3500 thermal simulative experimental machine. The fracture morphology of welding thermal cycle specimens with different t_(8/5) was observed by using SEM. The microstructure, prior austenite grain and the appearance of packet in HAZ were observed by using OM. The block width was measured by using EBSD. The cryogenic toughness of the welding thermal cycle specimens becomes better with increasing t_(8/5). With increasing t_(8/5)，the appearance of granular bainite makes the space of martensite diminish, which refines the packet and block sizes. The refinement of martensite packet is the reason of the improvement of cryogenic toughness in steel 9Ni.
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