GH36A合金電渣重熔Mg含量的控制

陳崇禧; 傅杰; 胡堯和; 劉錫奎; 張澍

doi:10.13374/j.issn1001-053x.1986.02.005

GH36A合金電渣重熔Mg含量的控制

Control of Magnesium Content in the GH36A Alloy during ESR

摘要

摘要: 本文根據文獻熱力學數據,導出了反應;
Mg%_F⁰+O%=MgO_(s)
的標準自由能變化ΔG°=-505009+145.03T,J.mol^-1(1780 ≤ T ≤ 2000°k)進而用熱力學分析了GH36合金在含MgO或MgF₂渣系中電渣重熔合金中Si、Mn等成分對產生或保持合金中含有 ≥ 0.0020Wt%Mg的不可能性,提出了含Mg的GH36A合金電渣重熔時自耗電極中含有少量Al的必要性。研究了原始Al含量(Al₀)、原始Mg含量(Mg₀)以及熔渣成分對錠中Mg含量Mg的影響。當渣池溫度為1690±10℃,0.32 ≤ Al₀ ≤ 0.62Wt%,0.0035 ≤ Mg₀ ≤ 0.0140Wt%,熔渣成分為0.10 ≤ N_MgO ≤ 0.30,0.05 ≤ N_{Al₂O₃ ≤ 0.21,N_CaO ≤ 0.15范圍,建立了GH36A合金電渣重熔控制Mg的關系式。
研究發現,含有適量的Mg、Al的GH36A合金可大幅度地提高合金在650℃,372.65×10⁶Pa的缺口、光滑持久壽命,消除合金缺口敏感性。}

Abstract: According to the eutccticum content of the Fe-Mg system,the standard free energy change of the following reaction is calculated.The result is as follows
Mg_(g)=Mg_1%(Fe) △G°=-108,993 + 63.25 T,J/g-at
It is then impossible to produce or retain Mg content ≥ 0.002% by means of Si or Mn in the GH36 alloy while ESR is conducted with slag containing MgO or MgF₂.The necessity of containing a few Al in consumanle-electrode during ESR has been proposed.The effect of the original contents of Al,Mg and the the composition of slag system CaF₂-MgO-Al₂O₃-CaO on the content of Mg in ingot is investigated.At temperature of the slag pool is about 1690±10℃, 0·32 ≤ Al_o ≤ 0.62wt%,0.0035 ≤ Mg_o ≤ 0.014 0 wt% and in the mole concentration range of the slag. 0.10 ≤ N_Mgo ≤ 0.30,0.05 ≥ N_At2O3 ≤ 0.21, N_CaO ≤ 0.15, the Mg content in the GH36A alloy after ESR may be controled.
It is found that the smooth and notched stress rupture life of the GH36A alloy contained suitable Mg and Al contents may be substantialy improved,and the notch sensitivity of the alloy may be eliminated under esting temperature of 650℃ and stress of 372.65Mpa

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