利用彩色金相法研究了TMCP(Thermal-Mechanical Control Process)工艺生产的超高强度船体海洋工程钢中马氏体/奥氏体(M/A)在等温过程、连续冷却过程和回火时的演变特点.结果表明M/A的形态尺寸与分布主要取决于组织转变的温度,加长转变的时间长只对0.5μm以下微粒状M/A略有影响.冷却速度低于2℃/s时会形成尺寸在2 μm以上较大的M/A,对钢的韧性有损害.另外,回火过程中尤其是600℃以上回火时,M/A的总量明显减少,M/A球团化趋势明显,M/A个体尺寸有明显增大,对钢的韧性起到破坏作用.
The evolution of martensite/austenite (M/A) microstructure formed during isothermal treatment,continuous cooling and tempering processes in a super high strength TMCP steel for ship hull and offshore structure was investigated by tint etching method. It is shown that the morphology,size and distribution of M/A mainly depends on transformation temperature,and the time of transformation slightly affects the particle M/A with the size less than 0. 5μm. Mass M/A bigger than 2 μm is observed in the steel with the cooling rate lower than 2℃/s,which deteriorates toughness of the steel. During tempering especiaUy at the temperature higher than 600 ℃ ,the amount of M/A decreases drastically,and the morphology of M/A tends to be sphericized and it's size increases obviously,leading to the decrease of toughness.
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