热处理对S30432喷丸不锈钢抗高温水蒸汽氧化性能的影响
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摘要
将S30432钢喷丸样品进行不同温度热处理,研究样品620℃下在90%H_2O+10%Ar气氛中的氧化行为。采用光学显微镜(OM)观察喷丸形变层组织形貌;通过测量不同时间氧化膜厚度,获得氧化动力学曲线;利用X射线衍射仪(XRD)、扫描电镜(SEM)及能谱仪(EDS)等对氧化产物成分、形貌及结构进行分析。结果表明:热处理过程中S30432钢喷丸样品形变层组织形貌无明显变化;氧化过程中,样品喷丸形变层内晶粒发生再结晶长大;氧化2000 h后,样品喷丸形变层内晶粒尺寸及碎化晶层厚度基本相同。不同温度热处理的S30432钢喷丸样品在高温水蒸汽中均生成由Cr_2O_3、(Fe,Cr)_2O_3、FeCr_2O_4以及少量Fe_3O_4和Fe_2O_3组成的富Cr氧化物薄膜。730～800℃热处理对S30432喷丸不锈钢抗高温水蒸汽氧化性能无明显影响。
The oxidation behavior of shot blasted S30432 stainless steel samples with different heat treatment in 90%H_2O+10%Ar atmosphere at 620 ℃ were investigated, microstructure of shot blasted deformed layers was observed by optical microscope(OM), and the oxidation kinetics curves were obtained by measuring the thickness of oxidation film at different time during the oxidation test. The composition, morphology and structure of oxidation products were studied by means of X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS) analysis. The results show that the microstructure of the deformed layer of the S30432 steel shot blasted sample has no obvious change during the heat treatment, and the recrystallization and growth of the fragmented grains in the deformed layer of each sample occur during the oxidation process. After oxidation for 2000 h, the grain size and the thickness of the fragmented grain layer in deformed layer with different heat treatment are almost the same. An Cr rich oxide film forms on the sample surfaces with different heat treatment in high-temperature steam atmosphere, which is mainly composed of Cr_2O_3,(Fe,Cr)_2O_3, FeCr_2O_4, and a small amount of Fe_3O_4 and Fe_2O_3. The heat treatment at 730-800 ℃ has no obvious effect on the high temperature steam oxidation resistance of the shot blasted S30432 stainless steel.
The oxidation behavior of shot blasted S30432 stainless steel samples with different heat treatment in 90%H_2O+10%Ar atmosphere at 620 ℃ were investigated, microstructure of shot blasted deformed layers was observed by optical microscope(OM), and the oxidation kinetics curves were obtained by measuring the thickness of oxidation film at different time during the oxidation test. The composition, morphology and structure of oxidation products were studied by means of X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectrometer(EDS) analysis. The results show that the microstructure of the deformed layer of the S30432 steel shot blasted sample has no obvious change during the heat treatment, and the recrystallization and growth of the fragmented grains in the deformed layer of each sample occur during the oxidation process. After oxidation for 2000 h, the grain size and the thickness of the fragmented grain layer in deformed layer with different heat treatment are almost the same. An Cr rich oxide film forms on the sample surfaces with different heat treatment in high-temperature steam atmosphere, which is mainly composed of Cr_2O_3,(Fe,Cr)_2O_3, FeCr_2O_4, and a small amount of Fe_3O_4 and Fe_2O_3. The heat treatment at 730-800 ℃ has no obvious effect on the high temperature steam oxidation resistance of the shot blasted S30432 stainless steel.
引文
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[19] 贾建民,Montgomery M.超超临界机组锅炉用不锈钢管表面冷作硬化处理对其抗蒸汽氧化性能的影响[J].热力发电,2009,38(6):32-37.JIA Jian-min,Montgomery M.Influence of cold work hadening surface of austenitic stainless steel tubes used in ultrasupercrtical boilers upon the tubes steam oxidation behavior[J].Thermal Power Generation,2009,38(6):32-37.
[20] Peng X,Yan J,Zhou Y,et al.Effect of grain refinement on the resistance of 304 stainless steel to breakaway oxidation in wet air[J].Acta Materialia,2005,53(19):5079-5088.
[21] 李铁藩.金属高温氧化和热腐蚀[M].北京:化学工业出版社,2003.
[22] 崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2009.
[2] 黄丽琴,刘光明,张民强,等.Super304H和HR3C奥氏体钢在模拟锅炉高硫气氛中的腐蚀行为[J].材料热处理学报,2017,38(9):155-161.HUANG Li-qin,LIU Guang-ming,ZHANG Min-qiang,et al.Corrosion behavior of Super304H and HR3C austenitic steels in simulated flue-gas boiler environments with high sulfur concentration[J].Transactions of Materials and Heat Treatment,2017,38(9):155-161.
[3] 郭岩,唐丽英,周荣灿,等.晶粒尺寸和表面状态对S30432钢蒸汽氧化行为的影响[J].动力工程学报,2011,31(8):644-648.GUO Yan,TANG Li-ying,ZHOU Rong-chan,et al.Effect of grain size and surface state on steam oxidation behaviour of S30432 steel[J].Journal of Chinese Society of Power Engineering,2011,31(8):644-648.
[4] 赵慧传,唐丽英,贾建民,等.喷丸处理对S30432锅炉管抗蒸汽氧化性能的影响[J].中国电力,2014,47(4):9-13.ZHAO Hui-chuan,TANG Li-ying,JIA Jian-min,et al.Influences of shot blasting on steam oxidation resistance of S30432 boiler tubes[J].Electric Power,2014,47(4):9-13.
[5] 李茂东,倪进飞,王彩福,等.T92钢在高温水蒸气中的氧化行为[J].表面技术,2014(3):10-14.LI Mao-dong,NI Jin-fei,WANG Cai-fu,et al.Oxidation behavior of T92 steel in high-temperature water-vapor atmosphere[J].Surface Technology,2014(3):10-14.
[6] 刘正东,程世长,杨钢,等.中国超超临界火电机组用S30432钢管研制[J].钢铁,2010,45(6):1-6.LIU Zheng-dong,CHENG Shi-chang,YANG Gang,et al.Research and development of S30432 steel tubes in China used for ultra supercritical (USC) power plants[J].Iron and Steel,2010,45(6):1-6.
[7] 李荣斌,王相虎,尚海龙,等.复合喷丸工艺对S30432钢表面应力与组织的影响[J].热加工工艺,2012,41(4):148-149.LI Rong-bin,WANG Xiang-hu,SHANG Hai-long,et al.Effect of composite shot peening on residual stress and microstructure of S30432 steel[J].Hot Working Technology,2012,41(4):148-149.
[8] 李丹,李冬升,戴起勋,等.超超临界火电用Super304H不锈钢管的组织分析[J].金属热处理,2010,35(5):93-95.LI Dan,LI Dong-sheng,DAI Qi-xun,et al.Microstructure analysis of Super304H steel pipe used for ultra-super-critical boiler[J].Heat Treatment of Metals,2010,35(5):93-95.
[9] Abe F.Research and development of heat-resistant materials for advanced USC power plants with steam temperatures of 700 ℃ and above[J].Engineering,2015,1(2):211-224.
[10] 赵慧传,王彩侠,贾建民,等.变形对奥氏体不锈钢管喷丸效果的影响[J].中国电机工程学报,2012,32(20):126-130.ZHAO Hui-chuan,WANG Cai-xia,JIA Jian-min,et al.Influences of deformation on shot blasting effect of austenite stainless steel tubes[J].Proceedings of the CSEE,2012,32(20):126-130.
[11] 岳增武,李辛庚.喷丸处理提高奥氏体耐热钢抗氧化性能的研究及应用[J].材料热处理学报,2013,34(1):157-162.YUE Zeng-wu,LI Xin-geng.Research and application of shot peening on oxidation resistance of austenitic steels in steam[J].Transactions of Materials and Heat Treatment,2013,34(1):157-162.
[12] 岳增武,傅敏,李辛庚,等.内壁喷丸处理对TP304H耐热钢锅炉管抗水蒸汽氧化性能的影响[J].中国腐蚀与防护学报,2012,32(2):137-140.YUE Zeng-wu,FU Min,LI Xin-geng,et al.Effect of shot peening treatment on steam oxidation resistance of TP304H reheater tube[J].Journal of Chinese Society for Corrosion and Protection,2012,32(2):137-140.
[13] 王彩侠,贾建民,赵慧传,等.加热温度对奥氏体不锈钢管内壁喷丸处理效果的影响[J].热力发电,2011,40(12):87-91.WANG Cai-xia,JIA Jian-min,ZHAO Hui-chuan,et al.Influence of heating temperature upon shot-blasting treatment on internal surface of austenitic stainless steel tubes[J].Thermal Power Generation,2011,40(12):87-91.
[14] 赵雷,乔汉文,梁军,等.焊接参数对T92/S30432异种钢焊接接头室温力学性能的影响[J].机械工程材料,2015,39(1):32-38.ZHAO Lei,QIAO Han-wen,LIANG Jun,et al.Effects of welding parameters on room temperature mechanical properties of T92/S30432 dissimilar welded joint[J].Materials for Mechanical Engineering,2015,39(1):32-38.
[15] 王彩侠,贾建民,赵慧传,等.S30432奥氏体钢管喷丸强化形变层组织和特性[J].中国电力,2011,44(8):43-47.WANG Cai-xia,JIA Jian-min,ZHAO Hui-chuan,et al.Structure and characteristics of shot-peened strengthening of internal surface of austenitic stainless steel S30432 tube[J].Electric Power,2011,44(8):43-47.
[16] Hur D H,Choi M S,Lee D H,et al.Effect of shot peening on primary water stress corrosion cracking of alloy 600 steam generator tubes in an operating PWR plant[J].Nuclear Engineering and Design,2004,227(2):155-160.
[17] Minami Y,Tooyama A,Seki M,et al.Steam-oxidation resistance of shot blasted stainless steel tubing after 10-year service[J].1996,(75):1-10.
[18] Li X,He J.Effect of shot blasting on oxidation behavior of TP304H steel at 610-770 ℃ in water vapor[J].Materials Letters,2006,60(3):339-344.
[19] 贾建民,Montgomery M.超超临界机组锅炉用不锈钢管表面冷作硬化处理对其抗蒸汽氧化性能的影响[J].热力发电,2009,38(6):32-37.JIA Jian-min,Montgomery M.Influence of cold work hadening surface of austenitic stainless steel tubes used in ultrasupercrtical boilers upon the tubes steam oxidation behavior[J].Thermal Power Generation,2009,38(6):32-37.
[20] Peng X,Yan J,Zhou Y,et al.Effect of grain refinement on the resistance of 304 stainless steel to breakaway oxidation in wet air[J].Acta Materialia,2005,53(19):5079-5088.
[21] 李铁藩.金属高温氧化和热腐蚀[M].北京:化学工业出版社,2003.
[22] 崔忠圻,覃耀春.金属学与热处理[M].北京:机械工业出版社,2009.