锻压技术

700 MW级水轮发电机镜板镜面均匀性控制研究

英文标题：Research on surface uniformity control of runner plate for 700 MW hydrogenerator

作者：罗晋平钟约先马庆贤袁朝龙

单位：清华大学

分类号：TG316

出版年,卷(期):页码：2013,38(5):7-12

摘要：

大型水轮发电机组镜板制造是制约我国水电装备国产化的瓶颈之一。某700 MW级国产化机组镜板采用25CrMo4材料锻造而成，保证镜板面的硬度均匀性是其主要技术难点之一。本文采用热模拟锻造及热处理实验，深入研究了锻造温度、应变量、应变速率、回火温度和淬火深度对25CrMo4的微观组织及硬度均匀性的影响。结果表明：锻造时，在高温下采用大变形速率有利于细化晶粒，而混晶可能导致镜板面硬度超差；热处理时，回火温度和淬火深度对硬度的影响明显，只有镜板面上各点回火温度波动小于40 ℃，淬火深度的差异小于30 mm时，硬度差才可能满足小于30 HB的要求。

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.

基金项目：

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

罗晋平（1977-），男，博士

参考文献：

［1]JB/T 7023-2002. 水轮发电机镜板锻件技术条件[S].JB/T 7023-2002. Specification for runner plate forgings for hydrogenerator[S].
［2]叶健松,徐祖耀. 35CrMo钢动态再结晶的实验研究与数值模拟[J]. 轧钢, 2004，(5): 23-27.Ye J S,Xu Z Y. Experimental research and numerical simulation of dynamic recrystallization of 35CrMo steel [J]. Steel Rolling, 2004,(5): 23-27.
［3]杨辉,吴任东,朱倩,等. 21CrMo10钢高温塑性变形性能[J]. 塑性工程学报, 2010,(6): 88-92.Yang H,Wu R D,Zhu Q,et al. Plastic-deformation properties of 21CrMo10 at high temperature
［J]. Journal of Plasticity Engineering, 2010,(6):88-92.
［4］刘鑫,钟约先,马庆贤,等. 30Cr2Ni4MoV钢多道次变形条件下的动态再结晶行为[J]. 塑性工程学报, 2010,(2):115-119.Liu X,Zhong Y X,Ma Q X,et al. Research on the dynamic recrystallization behavior of 30Cr2Ni4MoV LP rotor steel under multi-pass deformation[J]. Journal of Plasticity Engineering, 2010,(2):115-119.
［5］刘鑫,钟约先,马庆贤,等. 低压转子钢30Cr2Ni4MoV动态再结晶行为研究[J]. 中国机械工程, 2010,(5): 603-606.Liu X,Zhong Y X,Ma Q X,et al.Research on dynamic recrystallization behavior of 30Cr2Ni4MoV rotor steel [J]. China Mechanical Engineering, 2010,(5):603-606.
［6］高维林,白光润,栾瑰馥,等. 金属热变形中动态再结晶的临界判据[J]. 东北工学院学报, 1993,(1): 49-53.Gao W L,Bai G R,Luan G F, et al. A criterion for dynamic recrystallization in metals hot working [J]. Journal of Northeast University of Technology, 1993,(1): 49-53.
［7］王进,陈军,张斌,等. 35CrMo结构钢热塑性变形流动应力模型[J]. 上海交通大学学报, 2005,(11): 48-50.Wang J,Chen J,Zhang B,et al. Steel during hot forming [J]. Journal of Shanghai Jiaotong University, 2005,(11):48-50.
［8］毛卫民,赵新兵. 金属的再结晶与晶粒长大[M]. 北京: 冶金工业出版社, 1994.Mao W M,Zhao X B. Recrystallization and Grain-growth of Metals [M].Beijing:Metallurgical Industry Press, 1994.

［9］朱峰,曹起骧,徐秉业. ASME SA508-3钢的再结晶晶粒细化规律
［J］. 塑性工程学报, 2000,(1): 1-3.

Zhu F, Cao Q X, Xu B Y. The regulation of recrystallization softening on steel of ASME SA508-3
［J］. Journal of Plasticity Engineering, 2000,(1):1-3.

［10］金朝阳,崔振山. 变形温度对动态再结晶行为的影响
［J］. 扬州大学学报:自然科学版, 2011,(2): 60-64.

Jin Z Y,Cui Z S. The effect of deformation temperature on dynamic recrystallization
［J］. Journal of Yangzhou University:Natural Science Edition, 2011,(2):60-64.

［11］吴新丽,牛靖,董俊明. 回火温度对25Cr2Ni4MoV钢组织和性能的影响
［J］. 热加工工艺, 2008,(20): 76-78.

Wu X L,Niu J,Dong J M. Effect of tempering temperature on microstructure and properties of 25Cr2Ni4MoV steel
［J］. Hot Working Technology, 2008,(20):76-78.

［12］李继红,李岩,张海存,等. 回火温度对40CrNiMo7钢组织与性能的影响
［J］. 金属热处理, 2011,(7): 28-31.

Li J H,Li Y,Zhang H C,et al. Influence of tempering temperature on microstructure and mechanical properties of 40CrNiMo7 steel
［J］. Heat Treatment of Metals, 2011,(7):28-31.

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