摘要
通过宏观形貌特点、断裂面形态特征和微观金相组织检验特点等三个方面,对水冷壁管横向裂纹进行失效机理分析,推断出水冷壁管横向裂纹失效的共因是水冷壁管运行超温导致向火侧材料屈服强度降低这一共因,从而提出采用水冷壁管变系数热应力计算模型替代传统的常系数热应力计算模型的计算方法。结果表明,变系数热应力计算模型能较准确跟踪管壁温度的变化率。
By three aspects of macro-topographic characteristics, the morphological characteristics of fi＇acture surface, microscopic metallographic examination, the water wall tube transverse crack failure mechanism was analyzed. The results show that the common cause of water wall tube transverse crack failure is that the flame facing side water wall pipe running over-temperature leading to the decrease of material yield strength, which can put forward the water wall tube variable coefficient thermal stress calculation model instead of conventional constant coefficient of thermal stress calculation model. The results show that the variable coefficients of thermal stress calculation model can accurately track the rate of the change of wall temperature.
出处
《热加工工艺》
CSCD
北大核心
2013年第10期83-86,共4页
Hot Working Technology
基金
广西高等学校"特色专业及课程一体化建设项目"(GXTSZY-123)
中央财政支持高等职业学校专业建设发展资助项目资助(2012)
关键词
水冷壁管
横向裂纹
失效机理
变系数热应力计算模型
water wall tube
transverse crack
failure mechanism
thermal stress calculation model with variable coefficient
