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研究了淬火温度对高强海洋平台用钢组织和低温韧性的影响。结果表明,760℃加热保温时沿粒状贝氏体晶界呈网状分布的奥氏体在淬火后转变为孪晶马氏体,回火过程中发生分解,对韧性造成损害。790℃加热保温时所生成的奥氏体在随后的淬火过程中转变为贝氏体岛,回火稳定性较强。未奥氏体化的粒状贝氏体在加热过程中发生再结晶,生成软相组织多边形铁素体,有助于钢板低温韧性的提高。
The effect of quenching temperature on the microstructure and low temperature toughness of high strength marine platform steel was studied. The results show that the austenite distributed along the granular bainite grain boundaries at 760 ℃ is transformed into twins martensite after quenching, and it decomposes during the tempering and damages the toughness. The austenite generated during heating and holding at 790 ℃ is transformed to bainite island in the subsequent quenching process, and the tempering stability is strong. The non-austenitized granular bainite recrystallizes during heating to produce polygonal ferrite with soft phase structure, which contributes to the improvement of the low temperature toughness of the steel plate.