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研究了CLAM钢在600℃时效1100和3000 h后的显微组织与力学性能变化.结果表明,随着时效时间的延长.CLAM钢中析出相的数量逐渐增多,尺寸增大.时效1100 h时,CLAM钢的强度略有提高;时效至3000 h时,CLAM钢强度又有所降低.与原始热处理态相比,时效1100 h后CLAM钢的韧脆转变温度升高,但时效时间延长到3000 h时,韧脆转变温度又降低到原始热处理态水平.根据钢中析出相在时效过程中的析出和粗化行为.解释了CLAM钢时效不同时间后强度、冲击韧性和韧脆转变温度的变化,同时还指出钢中较低的W含量可以有效延缓钢中Laves相的析出.
The microstructures and mechanical properties of CLAM steel after aging at 600 ℃ for 1100 and 3000 h were studied.The results show that the number of precipitated phases in CLAM steel increases gradually with the increase of aging time.When the aging time is 1100 h , The strength of CLAM steel increased slightly, and the strength of CLAM steel decreased after 3000 h aging.Compared with the original heat-treated state, the ductile-brittle transition temperature of CLAM steel increased after aging for 1100 h, but the aging time prolonged to 3000 h, the ductile-brittle transition temperature is reduced to that of the original heat-treated state.According to the precipitation and coarsening behavior of precipitated phase in steel during aging, the changes of strength, impact toughness and ductile-brittle transition temperature , But also pointed out that the lower W content in steel can effectively delay the precipitation of Laves phase in steel.