Transactions of Materials and Heat Treatment

Title：Research on surface uniformity control of runner plate for 700 MW hydrogenerator

Authors： LUO Jin-ping ZHONG Yue-xian MA Qing-xian YUAN Chao-long

Unit： Tsinghua University

KeyWords： forging heat treatment large runner plate 25CrMo4 hardness uniformity

ClassificationCode：TG316

year,vol(issue):pagenumber：2013,38(5):7-12

Abstract：

The large runner plate is a bottleneck of complete localization of China-made hydrogenerator. 25CrMo4 is used for a China-designed runner plate of 700MW hydrogenerator. To ensure hardness uniformity of runner surface is one of the main technical difficulties. The effects of forging temperature, strain,strain rate, temper temprature and depth of quenching on microstructure and hardness uniformity of 25CrMo4 were investigated by simulation forging and heat-treating test. The result shows that high strain rate of forging at high temperature is favourable for grain refinement, and mixed crystal may be a reason for big hardness difference on runner surface. Temper temperature and depth of quenching affect hardness obviously in heat treatment.To achieve a hardness difference less than 30 HB, the range of temperature variation must be less than 40 ℃ and the difference of depth of quenching between any point of runner surface must be limited to 30 mm.

Funds：

“十一五”国家科技支撑计划项目（2007BAF02B02，2007BAF02B07）

罗晋平（1977-），男，博士

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