研究了Hastelloy C-276在550,750,800℃等温时效不同时间后的相析出及晶界附近Mo的质量分数变化规律,结果表明:M6C型碳化物在较短时间内会沿晶界析出,且随碳化物的不断析出晶界附近Mo的质量分数会不断降低直到某一最小值(约为6%),然后开始升高.由于镍基耐蚀合金中Mo元素含量对其耐蚀性能有重大影响,因此本工作利用Thermo-Calc热力学计算结果,结合John-Mel恒温转变动力学及菲克第二定律模拟计算了不同热处理制度下的碳化物析出量及晶界附近Mo的质量分数变化规律.模拟结果表明晶界附近Mo的质量分数计算值与实验测量值基本吻合,这说明利用本模型可以预测该合金在不同热处理制度下晶界附近Mo的质量分数分布.利用上述模拟结果,也可以为该合金在不同应用环境下制定相应热处理工艺来避免其由于晶界贫Mo所出现的各种腐蚀失效问题.
参考文献
| [1] | R.B.Rebak;P.Crook .Nickel Alloys for Corrosive Environments[J].Advanced Materials & Processes,2000(2):37-42. |
| [2] | AKHTER J I;SHAIKH M A .Effect of aging on the hardness and impact properties of Hastelloy C-276[J].Journal of Materials Science Letters,2001,20:333-335. |
| [3] | Turchi PEA;Kaufman L;Liu ZK .Modeling of Ni-Cr-Mo based alloys: Part II - Kinetics[J].Calphad: Computer Coupling of Phase Diagrams and Thermochemistry,2007(2):237-248. |
| [4] | 秦紫瑞.Hastelloy C型铸造镍基合金的析出相及其对合金腐蚀行为的影响[J].材料工程,1995(09):18. |
| [5] | 邢卓.Hastelloy C系列合金综述[J].化工设备与管道,2007(02):51-58. |
| [6] | YOUNG D J;SMELTZER W W;KIRKALDY J S .The effects of molybdenum additions to nickel-chromium alloys on their sulfidation properties[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1975,6(06):1205-1215. |
| [7] | H. Sahlaoui;H. Sidhom;J. Philibert .Prediction of chromium depleted-zone evolution during aging of Ni-Cr-Fe alloys[J].Acta materialia,2002(6):1383-1392. |
| [8] | Jin-Woo Kim;Byung-Hak Choe;Jin-Sun Hong .Cracking Observed in the Socket Weld HAZ of Hastelloy C-276 Alloy[J].Journal of Korean Institute of Metal and Materials,2002(9):1016-1021. |
| [9] | STREICHER M A .Effect of composition and structure on crevice,intergranular,and stress corrosion of some wrought Ni-Cr-Mo alloys[J].Corrosion,1976,32(03):79-83. |
| [10] | AKHTER J J;SHAIKH M A;AHMAD M et al.Effect of aging on the hardness and impact properties of Hastelloy C-276[J].Journal of Materials Science Letters,2001,20(04):333-335. |
| [11] | 陆金生;王彪;姚影澄.钢和合金中常见相X-射线鉴定手册[M].北京:北京钢铁研究总院,1990 |
| [12] | You Fa Yin;Roy G. Faulkner .Model predictions of grain boundary chromium depletion in Inconel 690[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2007(5):2177-2197. |
| [13] | MAYO W E .Predicting IGSCC/IGA susceptibility of Ni-Cr-Fe alloys by modeling of grain boundary chromium depletion[J].Materials Science and Engineering,1997,232(1-2):129-139. |
| [14] | 余永宁.材料科学基础[M].北京:高等教育出版社,2006 |
| [15] | Andersson JO.;Helander T.;Hoglund LH.;Shi PF.;Sundman B. .THERMO-CALC & DICTRA, computational tools for materials science[J].Calphad: Computer Coupling of Phase Diagrams and Thermochemistry,2002(2):273-312. |
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