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| MICROSTRUCTURE AND IMPACT FRACTURE BEHAVIOUR OF HAZ OF F460 HEAVY SHIP PLATE WITH HIGH STRENGTH AND TOUGHNESS |
| LIU Dongsheng, CHENG Binggui, LUO Mi |
| Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625 |
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Cite this article:
LIU Dongsheng CHENG Binggui LUO Mi. MICROSTRUCTURE AND IMPACT FRACTURE BEHAVIOUR OF HAZ OF F460 HEAVY SHIP PLATE WITH HIGH STRENGTH AND TOUGHNESS. Acta Metall Sin, 2011, 47(10): 1233-1240.
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Abstract Thermal cycles of the heat–affected zone (HAZ) of an advanced F460 steel plate used as offshore structure and ship–building in the future were simulated by employing a Gleeble 3800 thermomechanical simulator. The microstructures of the HAZ formed at different heat input energies (E) were characterized by means of OM, SEM, EBSD and TEM, and mechanical properties were measured. When E is equal to 15 kJ/cm, the microstructures consist of mainly lath–like martensite (LM) with high density dislocations and large misorientations, between the laths exist fine martensite/austenite (M/A) constituents. When E is equal to 30 kJ/cm, lath–like bainite (LB) is formed. The lath grains and M/A constituents will coarsen and the amount of high angle (≥15?) boundaries will decrease with the increase of E to 50 kJ/cm. When E is in a range of 100—300 kJ/cm, the microstructures consist of granular bainite (GB)+upper bainite (UB)+quasi–polygonal ferrite (QPF). The hardness of the HAZ (HV), the maximum Charpy V notch (CVN) impact load (Pm), the brittle fracture arrested load (Pa), the crack propagation rate, and the entire displacement (d0) of the CVN impact course decrease with the increase of E. The size of cleavage facets increases with the increase of E, which can be used to explain the effective grain size of the HAZ increases with the increase of E, as a result, the hardness decreases and low temperature toughness deteriorates as E increases. The upper limit of the simulated heat input E for the F460 steel is 30 kJ/cm which makes the toughness of the HAZ equivalent to that of the mother plate at −60 ℃.
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Received: 10 March 2011
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