| Hastelloy C-276中碳化物析出及晶界贫Mo规律研究 |
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| 引用本文： | 焦少阳,朱冠妮,董建新,章清泉. Hastelloy C-276中碳化物析出及晶界贫Mo规律研究[J]. 材料工程, 2011, 0(1): 47-52,56 |
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| 作者姓名： | 焦少阳 朱冠妮 董建新 章清泉 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083
2. 北京北冶功能材料有限公司,北京,100192 |
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| 基金项目： | 国家自然科学基金资助项目(50831008) |
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| 摘 要： | 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,...
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| 关 键 词： | 等温时效 热力学计算 碳化物 贫Mo |
Carbide Evolution and Mo Depletion Law in Hastelloy C-276 |
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| JIAO Shao-yang,ZHU Guan-ni,DONG Jian-xin,ZHANG Qing-quan. Carbide Evolution and Mo Depletion Law in Hastelloy C-276[J]. Journal of Materials Engineering, 2011, 0(1): 47-52,56 |
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| Authors: | JIAO Shao-yang ZHU Guan-ni DONG Jian-xin ZHANG Qing-quan |
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| Affiliation: | JIAO Shao-yang1,ZHU Guan-ni1,DONG Jian-xin1,ZHANG Qing-quan2(1 School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China,2 Beijing Beiye Functional Materials Corporation,Beijing 100192,China) |
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| Abstract: | The phase evolution and Mo mass fraction variation law when Hastelloy C-276 thermally aged at 550,750,800℃ for different time were studied.The results show that the carbide is precipitated along grain boundary for short aging time,and the Mo mass fraction firstly decreases to a minimum value about 6%(mass fraction) with carbide precipitation,then increases with aging time duration.Since the Mo content in nickel-based corrosion resistant alloy is vital to the alloy’s resistance ability,the carbide precipitation process and Mo mass fraction variation near grain boundary(GB) were simulated according to Thermo-Calc calculation,John-Mel transformations kinetics and Fick second diffusion law.The comparison results between the simulated and measured mass fraction of Mo are in good agreement,this signifies that the Mo mass fraction distribution near GB can be predicted by the model presented in this work.Based on simulation results,proper heat treatment conditions for this alloy can be proposed according to the requirement of Mo content in the service corrosion environments. |
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| Keywords: | isothermal treatment thermo dynamic calculation carbide Mo depletion |
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