热处理对转轮残余应力分布规律研究  

Research on Distribution Law of Residual Stress for Hydro Turbine Runners

作　　者：王滨滨 董文哲 WANG Bin-bin;DONG Wen-zhe(Harbin Vocational and Technical University)

机构地区：[1]哈尔滨职业技术大学,黑龙江哈尔滨150000

出　　处：《电站系统工程》2025年第2期45-46,49,共3页Power System Engineering

基　　金：黑龙江省教育科学规划课题“发展新质生产力背景下一体两翼产教融合校企合作模式研究”(课题编号:ZJB1424103);2024年度中国机械工业教育协会课题“高职焊接专业依托产教融合人才培养模式研究”(项目编号:ZJJX24CZ012)资助。

摘　　要：转轮中残余应力的形成原因非常复杂,涉及到叶片铸造、加工应力、结构应力、焊接应力和热处理等多个方面。为了研究某电站转轮叶片易裂部位焊接应力的分布规律,对转轮同种材料焊接钢板进行两种方法测试应力数值,对比观察确定了盲孔法的可行性。通过实测组装前的打磨叶片,研究了热处理温度对焊态应力的影响。研究结果表明热处理后转轮焊缝附近的应力分布发生变化,应力曲线重新平衡,呈现均匀降低的状态,同时应力区域的分布还受到几何结构和空间位置的影响。The causes of residual stress in the impeller are very complex,involving multiple aspects such as blade casting,machining stress,structural stress,welding stress,and heat treatment.In order to study the distribution law of welding stress in the vulnerable parts of the turbine blades of a certain power plant,two methods were first used to test the stress values of welded steel plates of the same material for the turbine,and the feasibility of blind hole method was determined through comparative observation.The effect of heat treatment temperature on welding stress was studied by measuring the polished blades before assembly.The research results indicate that the stress distribution near the weld seam of the runner changes after heat treatment,and the stress curve rebalances,presenting a uniformly reduced state.At the same time,the distribution of the stress area is also affected by the geometric structure and spatial position.

关 键 词：焊接 裂纹 应力 热处理 

分 类 号：TG44[金属学及工艺—焊接] TH14[一般工业技术—材料科学与工程]