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本文运用物理冶金原理进行非调质钢的化学成份设计,研制出了σ_b>800MPa,a_(kv)>90J/cm~2的高强度高韧性中碳微合金非调质钢。利用光学显微镜、图象显微镜、电子分析仪、X射线衍射仪、X射线小角散射仪、相变仪等仪器重点研究了热加工条件和组织性能间的关系,测定了组织显微参数,研究了热加工过程各个阶段中M(C,N)相粒子的析出行为、状态、分布及其对钢的晶粒细化,沉淀强化等影响,并探讨了非调质钢的强韧化机制。
In this paper, the principle of physical metallurgy is used to design the chemical composition of non-quenched and tempered steel. The high-strength and high-toughness medium carbon microalloying non-quenched and tempered steel with σ_b> 800MPa and a_ (kv)> 90J / cm ~ 2 was developed. The relationship between thermal processing conditions and microstructure and properties was studied by means of optical microscope, image microscope, electronic analyzer, X-ray diffractometer, X-ray small-angle scatterometer and phase change instrument. Precipitation behavior, state and distribution of M (C, N) phase particles in each stage of thermal processing and their effects on grain refinement and precipitation strengthening of steel were discussed. The mechanism of strengthening and toughening of non-quenched and tempered steel was also discussed.