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基于“固体与分子经验电子理论”(EET),利用合金相和相界面的价电子结构参数统计值n′A、E′A、Δρ′、σ分析第二相粒子和固溶Nb对焊接HAZ组织和韧性的影响。结果表明:Nb元素固溶时,因Δρ′/σ值大于其他合金元素而使Nb具有强烈阻碍奥氏体晶界迁移的作用;第二相粒子Ti(V、Nb)C(N)析出时,形成相界面的Δρ′/σ较大,因而更能有效地钉扎奥氏体晶界而使高温奥氏体晶粒显著细化;第二相粒子析出后,能够促进新相铁素体生成,改善焊接HAZ韧性的机理也可追溯到n′A、E′A及Δρ′。上述分析结果与实验结果符合很好。
Based on the “empirical electron theory of solids and molecules” (EET), the second-phase particles and the solution-dissolved Nb pairs were analyzed using the statistics of the valence electron structure parameters nA, E’A, Δρ ’, σ of the alloy phase and the phase interface Effect of HAZ organization on weld and toughness. The results show that when the elemental Nb is precipitated, Nb has a strong impediment to the grain boundary migration due to the larger value of Δρ ’/ σ than the other alloying elements. When Ti (V, Nb) C (N) , The larger the Δρ ’/ σ of the phase interface is formed, so that the austenite grain boundaries can be more effectively pinned so as to significantly refine the high-temperature austenite grains. After the second phase particles are precipitated, the new phase ferrite The mechanism to generate and improve the HAZ toughness of welding can also be traced back to n’A, E’A and Δρ ’. The above analysis is in good agreement with the experimental results.