蒸气循环氧化对汽车用15CrMoG耐热钢表面组织和氧化行为的影响
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摘要
目前,采用蒸气循环氧化对汽车用15CrMoG钢进行性能研究的报道较少。对Ar气环境下氧化的15CrMoG钢表面进行蒸气循环氧化(Steam cycle oxidation,SCO)测试,分析了SCO处理对其增重动力学、表层氧化物以及氧化皮结构的影响。结果表明:随着SCO处理时间增加,耐热钢表面增重的结果表现出单调增加的变化趋势,且表现出线性增加规律; 1 000 h的SCO处理后的氧化增重为4.25 mg/cm2;经100 h的SCO处理后,表面生成了具有不同尺寸的颗粒形氧化产物; 1 000 h氧化后,得到了尺寸更加粗大的氧化物晶须,晶须中含有较高的Fe元素,属于Fe氧化物;当SCO处理时间达到500 h,氧化皮的结构分层现象已经很显著;经过1 000 h的SCO处理后,耐热钢表面形成了60 mm厚的氧化皮。
At present,there are fewer reports on the effect of steam cycle oxidation( SCO) on automotive 15 CrMoG steel. The 15 CrMoG steel surface oxidized in Ar gas environment was tested by SCO,and the influences of SCO treatment on the weight gain kinetics,surface oxide and oxidation skin structure were analyzed. Results showed that with the increase of SCO treatment time,the surface weight gain of heat-resistant steel exhibited monotonous increase,following a linear law. After SCO treatment for 1 000 h,the final oxidation gain was 4. 25 mg/cm2.Furthermore,granular oxidation products with different sizes were generated on the surface after SCO treatment for 100 h. When the oxidation process was carried out for 1 000 h,oxide whiskers with larger and thicker size were obtained,which contained higher Fe element and belonged to Fe oxide. When SCO processing time reached 500 h,the structural stratification of oxide scale became already significant. After SCO treatment for 1 000 h,an oxide film with a thickness of 60 mm was formed on the surface of heat-resistant steel.
At present,there are fewer reports on the effect of steam cycle oxidation( SCO) on automotive 15 CrMoG steel. The 15 CrMoG steel surface oxidized in Ar gas environment was tested by SCO,and the influences of SCO treatment on the weight gain kinetics,surface oxide and oxidation skin structure were analyzed. Results showed that with the increase of SCO treatment time,the surface weight gain of heat-resistant steel exhibited monotonous increase,following a linear law. After SCO treatment for 1 000 h,the final oxidation gain was 4. 25 mg/cm2.Furthermore,granular oxidation products with different sizes were generated on the surface after SCO treatment for 100 h. When the oxidation process was carried out for 1 000 h,oxide whiskers with larger and thicker size were obtained,which contained higher Fe element and belonged to Fe oxide. When SCO processing time reached 500 h,the structural stratification of oxide scale became already significant. After SCO treatment for 1 000 h,an oxide film with a thickness of 60 mm was formed on the surface of heat-resistant steel.
引文
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[2]吴明洋.100t LF Si-Ca脱氧低铝锅炉管用钢15CrMoG夹杂物分析[J].特殊钢,2018,39(1):65-67.
[3]田晓,徐慧,秦承鹏,等.锅炉过渡段水冷壁15Cr Mo G钢连接管安装阶段环向开裂的原因[J].机械工程材料,2017,41(7):105-110.
[4]朱志平,陆海伟,汤雪颖,等.不同水工况下超临界机组水冷壁管材料的腐蚀特性研究[J].中国腐蚀与防护学报,2014,34(3):243-248.
[5] YAN P,LIU Z D,BAO H S,et al. Effect of tempering temperature on the toughness of 9Cr-3W-3Co martensitic heat resistant steel[J]. Mater Des,2014,66(54):874-879.
[6] YU X L,JIANG Z Y,ZHAO J W,et al. Effect of a grainrefined microalloyed steel substrate on the formation mechanism of a tight oxide scale[J]. Corros Sci,2014,122(85):115-121
[7]杨卜,王成彦,李敦钫,等.杂质元素对锌蒸气氧化产物形貌的影响分析[J].材料导报,2010,24(12):53-57.
[8]马强,梁平,杨首恩,等.TP347H钢高温水蒸气氧化研究[J].材料热处理学报,2009,30(5):172-176.
[9]邓勇,刘盛波,彭芳芳,等. 600MW超临界锅炉TP347H屏式过热器管高温蒸气氧化腐蚀探讨[J].腐蚀与防护,2009,30(2):124-127.