改性HP40合金碳化物析出规律的热力学计算
Thermodynamic Calculation of Carbides Precipitation Behavior in Modified HP40 Alloys
摘 要
利用Thermo-Calc热力学计算软件和与之相应的铁基合金数据库, 计算了改性HP40合金中可能析出的平衡相及铌、钛和钨成分改变时对碳化物析出规律的影响, 并计算了碳化物的平衡化学成分, 以期为发展高稳定性的改性HP40合金提供理论依据。结果表明: 铌和钛是MC型碳化物的主要形成元素。随着铌和钛含量的提高, MC型碳化物的最大析出量增加, M23C6型和M7C3型碳化物的最大析出量减少, MC型和M23C6型碳化物的开始析出温度升高。钨元素在高温时主要分布在γ基体中, 在服役温度下长期时效, 钨从γ基体向M23C6型碳化物不断偏聚。随着钨含量的提高, M7C3型碳化物的最大析出量减少, M23C6型碳化物的开始析出温度及M7C3相向M23C6相转变的温度均显著升高。
耐热铸造合金
热力学计算
组织稳定性
modified HP40 alloys
heat-resistant cast alloy
thermodynamic calculation
structure stability
Abstract
Equilibrium phases in modified HP40 alloys and the effect of the alloying elements Nb, Ti and W in modified HP40 alloy on carbides precipitation behavior were investigated employing the Thermo-Calc software and Fe-alloys database. Chemical composition of the carbides was also calculated. The calculation results provide the theoretical bases for developing modified HP40 alloys with high structure stability. The results showed that Nb and Ti were the main forming elements of MC. With the increase of Nb and Ti, the precipitation content of MC was raised, the precipitation content of M23C6 and M7C3 were reduced, initial precipitation temperature of MC and M23C6 were raised. W elements were mainly distributed in the γ matrix at high temperature and would continue to segregate from γ matrix to M23C6 after long-term aging at the service temperature. With increasing the content of W, the precipitation content of M7C3 was reduced, initial precipitation temperature of M23C6 and transformation temperature from M7C3 to M23C6 were raised markedly.
中图分类号 TG142.73
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基金项目
收稿日期 2011/6/4
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备注韩一纯(1982-),男,工程师,硕士。
引用该论文: HAN Yi-chun,DONG Jian-xin,LIAN Xiao-ming,ZHANG Mai-cang. Thermodynamic Calculation of Carbides Precipitation Behavior in Modified HP40 Alloys[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2011, 47(9): 539～545
韩一纯,董建新,连晓明,张麦仓. 改性HP40合金碳化物析出规律的热力学计算[J]. 理化检验－物理分册, 2011, 47(9): 539～545
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参考文献
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【8】JOHANNE L, FRANCK T, RENE L G,et al. Influence of phase transformations on creep resistance in Fe-Ni-Cr alloys for reformer tube applications[C]//Pressure Vessels and Piping Conference of the American-Society-of-Mechanical-Engineers.San Antonio: [s.n.], 2007:43-49.
【9】GONG J M, TU S T, YOON K B. Damage assessment and maintenance strategy of hydrogen reformer furnace tubes[J].Engineering Failure Analysis,1999,6(3):143-153.
【10】THOMAS C W, BORSHEVSKY M, MARSHALL A N. Assessment of thermal history of niobium modified HP50 reformer tube by microstructure methods[J].Material Science and Technology,1992,8(10):855-861.
【11】THOMAS C W, STEVENS K J, RYAN M J. Microstructure and properties of alloy HP50-Nb: comparison of as cast and service exposed materials[J].Material Science and Technology,1996,12(6):469-475.
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【16】刘志国.合金元素对耐热钢组织及性能的影响[J].材料开发与应用,1997(2): 17-21.
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