摘要
通过对已累积运行15万h后F12钢主蒸汽管道取样弯管的持久强度以及高温蠕变裂纹开裂和扩展速率的试验研究,应用积累的F12钢高温持久性能数据,确定原始材料的LarsonMiller方程,并据此方程和弯管的持久性能数据,统计估算取样弯管的剩余寿命和等效运行应力;再应用高温蠕变裂纹开裂和扩展寿命评估法,计算取样弯管在等效运行应力条件下的高温蠕变裂纹开裂和扩展寿命,并对其进行剩余寿命评估;最后根据弯管的显微组织对预测结果进行了验证。结果表明:用Larson-Miller参数法评估得到的主蒸汽管道的剩余寿命为73 515h,等效运行应力为103.97MPa;用蠕变裂纹开裂和扩展寿命评估法得到的剩余寿命为153 354h;该主蒸汽管道仍可正常运行近10a;预测结果与试验验证结果一致。
Experimental study were carried out on creep-rupture strength and high-temperature creep crack initiation and propagation rate （CCGR） for sampling bend of main steam pipe with an accumulated operation time of 150 000 hours. The Larson-Miller equation of original material was determined based on statistical data of high temperature creep-rupture strength of F12 steel. The residual life and an equivalent operating stress of sampling blend were estimated by Larson-Miller equation and creep-rupture strength datas of the sampling blending, and then a high-temperature creep crack initiation and propagation life evaluation method was used to compute the high- temperature creep crak initiation and propagation life of the sampling blend under equivalent stress condition, meanwhile, the residual life was evaluated. At last, the prediction results were verified by microstructure of the sampling blend. The results show that the main steam pipe might had a residual life of 73 515 hours with an equivalent operating stress of 103. 97 MPa based on Larson-Miller method, while using creep crack initiation and propagation life evaluation method, the residual life was 153 354 hours. The main steam pipe could operate normally for nearly ten years in safety. The prediction results was agreement with the experimental results.
出处
《机械工程材料》
CAS
CSCD
北大核心
2014年第1期90-95,108,共7页
Materials For Mechanical Engineering
关键词
F12钢
主蒸汽管道
持久性能
剩余寿命
F12 steel
main steam pipe
creelp-rupture strength
residual life
