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本文根据文献热力学数据,导出了反应; [Mg]％_(F~0)+[O]％=MgO_((s))的标准自由能变化ΔG°=-505009+145.03T,J.mol~(-1)(1780≤T≤2000°k)进而用热力学分析了GH36合金在含MgO或MgF_2渣系中电渣重熔合金中Si、Mn等成分对产生或保持合金中含有≥0.0020Wt％Mg的不可能性,提出了含Mg的GH36A合金电渣重熔时自耗电极中含有少量Al的必要性。研究了原始Al含量([Al]_0)、原始Mg含量([Mg]_0)以及熔渣成分对锭中Mg含量[Mg]的影响。当渣池温度为1690±10℃,0.32≤[Al]_0≤0.62Wt％,0.0035≤[Mg]_0≤0.0140Wt％,熔渣成分为0.10≤N_(MgO)≤0.30,0.05≤N_(Al_2O_3)≤0.21,N_(CaO)≤0.15范围,建立了GH36A合金电渣重熔控制[Mg]的关系式。 研究发现,含有适量的Mg、Al的GH36A合金可大幅度地提高合金在650℃,372.65×10~6Pa的缺口、光滑持久寿命,消除合金缺口敏感性。
In this paper, the reaction was deduced based on the thermodynamic data of the literature. The standard free energy change of [Mg]% _ (F ~ 0) + [O]% = MgO_ (s) was ΔG ° = -505009 + 145.03T, (-1) (1780≤T≤2000 ° k). Furthermore, thermodynamic analysis of the composition of Si, Mn and other components of GH36 alloy in ESR alloy containing MgO or MgF 2 slag to produce or maintain alloy containing ≥0.0020Wt% Mg implies the necessity of containing a small amount of Al in the consumable electrode when electroslag remelting of Mg-containing GH36A alloy. The effects of the original Al content ([Al] _0), the original Mg content ([Mg] _0) and the slag composition on the Mg content in the ingot [Mg] were investigated. When the slag pool temperature is 1690 ± 10 ℃, 0.32≤ [Al] _0≤0.62Wt%, 0.0035≤ [Mg] _0≤0.0140Wt%, the slag composition is 0.10≤N_ (MgO) ≤0.30, 0.05≤N_ (Al_2O_3 ) ≤0.21, N_ (CaO) ≤0.15, the relationship between [Mg] and GH36A alloy electroslag remelting was established. The results show that the GH36A alloy containing proper amount of Mg and Al can greatly improve the alloy gap at 650 ℃ and 372.65 × 10 ~ 6Pa, smooth and long life, and eliminate the alloy notch sensitivity.