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为提高焦罐内衬板的使用寿命,借助光学显微镜、扫描电镜、Photoshop和Image tool图像处理软件从铸态显微组织、热疲劳裂纹的表面及截面形貌以及热疲劳裂纹损伤因子等方面对Cr17Mn10耐热钢的耐热疲劳性能进行分析。探讨了热疲劳裂纹的萌生及扩展规律。结果表明:在经高温1100℃和室温水冷循环300次下,Cr17Mn10耐热钢的耐热疲劳性较好。试样裂纹主要是在碳化物-基体相界面、铁素体-奥氏体的相界面以及晶界处萌生。细而深且密度较大的裂纹对于松弛弹性应变能有利,而单一的粗大裂纹易变宽变深,对材料的耐热疲劳性能不利。
In order to improve the service life of the coke oven liner, the microstructure of the as-cast microstructure, the surface of the thermal fatigue crack, the cross-sectional morphology and the thermal fatigue crack damage factor were analyzed by means of optical microscope, scanning electron microscope, Photoshop and Image tool image processing software Cr17Mn10 heat-resistant steel fatigue resistance analysis. The initiation and propagation of thermal fatigue crack were discussed. The results show that the heat-resistant fatigue resistance of Cr17Mn10 heat-resistant steel is better under high temperature of 1100 ℃ and room temperature water-cooling cycle of 300 times. The crack in the specimen mainly occurs at the carbide-matrix interface, the ferrite-austenite phase interface and the grain boundary. Thin, deep, and dense cracks are good for relaxation elastic strain, whereas a single coarse crack becomes wider and deeper, which is unfavorable to the thermal fatigue resistance of the material.