800 ℃长期氧化过程中含铝奥氏体耐热钢中第二相的演化规律
Secondary Phase Evolution in Alumina-Forming Austenitic Heat-Resistant Steel during Long-Term Oxidation at 800 ℃
摘 要
采用真空电弧熔炼技术制备了含铝奥氏体耐热钢, 经过冷轧和热处理后, 研究了其在800 ℃含10%(体积分数)水蒸气的空气中氧化100~7 200 h过程中第二相的演化规律。结果表明: 氧化前试验钢中基本没有第二相析出, 而氧化后在奥氏体基体中主要析出了NbC、Laves-Fe2Nb、B2-NiAl和σ-FeCr四种第二相; 细小的NbC呈弥散分布, 随着氧化时间的延长其数量和形态无明显变化; 奥氏体晶界上析出的B2-NiAl相随着氧化时间的延长不断粗化且呈不连续分布, 而晶内的主要以细小的短棒状弥散分布; 氧化层与奥氏体基体间出现明显的B2-NiAl贫化区, 其宽度随氧化时间的延长而不断增加; σ-FeCr相不连续地分布在奥氏体晶界上, 并随着氧化的进行而不断粗化。
第二相
高温氧化
austenitic heat-resistant steel
secondary phase
high-temperature oxidation
Abstract
An alumina-forming austenitic heat-resistant steel was produced by the vacuum arc melting technique. After cold-rolling and heat treatment, the evolution of secondary phases in the steel was investigated during the process of oxidation at 800 ℃ for 100-7 200 h in the air containing 10vol% water vapor. The results show that before oxidation no second phases in the tested steel were precipitated. However, four second phases of NbC, Laves-Fe2Nb, B2-NiAl and σ-FeCr were found in the austenitic matrix after oxidation. The fine NbC phase showed a dispersive distribution and the amount and shape remained unchanged with the increase of oxidation time. With the increase of oxidation time, the B2-NiAl phase on the austenitic grain boundaries was coarsened and dispersed discontinuously while that in austenitic grains was dispersed well with a fine and short-rod-like shape. Between the oxide scale and the austenitic matrix, the obvious NiAl denuded zone appeared and whose width increased with the oxidation time increasing. The σ-FeCr phase was discontinuously distributed on the austenitic grain boundaries and coarsened with the oxidation continuing.
中图分类号 TG142.1 DOI 10.11973/jxgccl201612002
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51301122); 安徽省自然科学基金资助项目(1408085QE82); 铜陵学院学术带头人及后备人选科研资助项目(2014tlxyxs29)
收稿日期 2015/9/11
修改稿日期 2016/10/28
网络出版日期
作者单位点击查看
备注徐向棋(1979-), 男, 浙江长兴人, 副教授, 博士。
引用该论文: XU Xiang-qi,CHEN Zi-pan,WANG Jing-wen,ZHANG Shao-wu,LUO Lai-hui,WANG Song-lin. Secondary Phase Evolution in Alumina-Forming Austenitic Heat-Resistant Steel during Long-Term Oxidation at 800 ℃[J]. Materials for mechancial engineering, 2016, 40(12): 6～8
徐向棋,陈子潘,王泾文,张少伍,罗来辉,王松林. 800 ℃长期氧化过程中含铝奥氏体耐热钢中第二相的演化规律[J]. 机械工程材料, 2016, 40(12): 6～8
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【12】XU X Q, ZHANG X F, SUN X Y,et al. Effects of silicon additions on the oxide scale formation of an alumina-forming austenitic alloy［J］. Corrosion Science,2012,65(4):317-321.
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【2】YAMAMOTO Y, BRADY M P, LU Z P,et al. Creep-resistant, Al2O3-forming austenitic stainless steels［J］. Science, 2007, 316(5823): 433-436.
【3】BRADY M P, YAMAMOTO Y, SANTELLA M L,et al. Composition, microstructure, and water vapor effects on internal/external oxidation of alumina-forming austenitic stainless steels［J］. Oxidation of Metals, 2009, 72(5/6): 311-333.
【4】BRADY M P, YAMAMOTO Y, SANTELLA M L,et al. Effects of minor alloy additions and oxidation temperature on protective alumina scale formation in creep-resistant austenitic stainless steels［J］. Scripta Materials, 2007, 57(12):1117-1120.
【5】XU X Q, ZHANG X F, CHEN G L,et al. Improvement of high-temperature oxidation resistance and strength in alumina-forming austenitic stainless steels［J］. Materials Letters, 2011, 65: 3285-3288.
【6】ZHOU D Q, XU X Q, MAO H H, et al. Plastic flow behaviour in an alumina-forming austenitic stainless steel at elevated temperatures［J］. Materials Science and Engineering A, 2014, 594(4): 246-252.
【7】刘一泽, 董显平, 张澜庭, 等.再结晶温度对新型含铝奥氏体耐热钢显微组织及蠕变性能的影响［J］.机械工程材料, 2015, 39(4): 86-90.
【8】BRADY M P, FAYEK M, KEISER J R,et al. Wet oxidation of stainless steels: New insights into hydrogen ingress［J］. Corrosion Science, 2011, 53(5): 1633-1638.
【9】周德强, 刘雄军, 吴渊, 等.新型奥氏体耐热不锈钢再结晶行为及其对力学性能的影响［J］.金属学报, 2014, 50(10): 1217-1223.
【10】BRADY M P, UNOCIC K A, LANCE M J, et al. Increasing the upper temperature oxidation limit of alumina forming austenitic stainless steels in air with water vapor［J］. Oxidation of Metals, 2011, 75(5/6): 337-357.
【11】XU X Q, ZHANG X F, SUN X Y,et al. Roles manganese in the high-temperature oxidation resistance of alumina-forming austenitic steels at above 800 ℃［J］. Oxidation of Metals, 2012, 78(5/6): 349-362.
【12】XU X Q, ZHANG X F, SUN X Y,et al. Effects of silicon additions on the oxide scale formation of an alumina-forming austenitic alloy［J］. Corrosion Science,2012,65(4):317-321.
【13】YAN Y F, XU X Q, ZHOU D Q, et al. Hot corrosion behaviour and its mechanism of a new alumina-forming austenitic stainless steel in molten sodium sulphate［J］. Corrosion Science, 2013, 77(1): 202-209.
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