采用固溶+时效的热处理方法研究了时效温度对HSLA(High Strength Low Alloy)高强船体钢组织性能的影响.结果表明,试验钢在450℃处出现强度峰值,这是由大量纳米级的Cu析出物(＜5 nm)和少量Nb(C,N)粒子的共同强化造成.过时效状态下,基体的软化作用加强,且Cu析出粒子尺寸显著增大(10～30 nm),沉淀强化作用也逐渐减弱,钢的强度下降.时效过程中基体软化和析出相沉淀强化的共同作用决定了HSLA高强船体钢的性能变化规律.试验钢在650～670℃范围内时效不仅获得了670～780 MPa的强度,而且保证-40℃冲击功在80 J以上,体现出良好的强韧性匹配.
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