The failure of a gear shaft was analyzed by SEM analysis, macrograph, metallographical examination, mechanical test, chemical analysis and etc. 摘要采用扫描电镜、低倍检验、金相检验、力学试验和化学分析等方法，分析了人字齿轮轴发生劈裂的原因。
From the macrograph of the W-coating after heat treatment can see abscission of W-coating ,and which deposited 5 hours is very serious. 涂层的表面有延伸的微裂纹，钨涂层的宏观照片显示沉积了钨涂层5个小时的试样热处理后有严重的脱落现象。
The macrograph, micrograph and fracture surface of a failiure conduit of the primary reformer were analyzed with optical microscope and SEM. 用光学显微镜、扫描电镜对一段炉下集气管鼓胀破裂的导淋管的宏观、微观组织，断口形貌进行了分析。
In addition,The general macrograph characters of spalling of bonding layer and shallow working lining,and their causes were described. 总结了轧辊磨损预报模型的研究现状,并详细介绍了典型的磨损预报模型,最后展望了冷轧辊研究工作的方向。
Abstract The failure of a gear shaft was analyzed by SEM analysis, macrograph, metallographical examination, mechanical test, chemical analysis and etc. 摘要 采用扫描电镜、低倍检验、金相检验、力学试验和化学分析等方法，分析了人字齿轮轴发生劈裂的原因。
Analyzes from this kind of cigarette shredded tobacco moisture content different smoke appraises the similar total macrograph volatile chemical composition. 从该种卷烟烟丝含水率不同的烟支中都分析鉴定出同样的总粒相物挥发性化学成分。
