摘要
通过研究汽轮机转子焊接模拟件接头的低周疲劳性能,可为评估转子启停、转速或负荷变化等工况条件下的安全性提供参考。测试了25Cr2Ni2MoV和30Cr2Ni4MoV两种焊接转子模拟件接头室温下的低周疲劳性能,发现在较大应变幅作用下,塑性是其接头低周疲劳寿命的主要影响因素,而两种接头均具有良好的塑性储备,对疲劳寿命有利;与文献报道的30Cr2Ni4MoV锻件相比,在失效载荷相同的条件下,两种材料的埋弧焊接头可承受的弹性应变幅高于锻件,塑性应变幅略低于锻件。从整体上看,两种材料的焊接接头疲劳循环参数相近,均具有良好的低周疲劳性能。
The low cycle fatigue property of the welded joint has a great influence on the safety of turbine rotor, especially in the case of start-up and speed changing. The low cycle fatigue property of the rotor joint＇ simulating part has been studied according to the actual material （25Cr2Ni2MoV and 30Cr2Ni4MoV ） and manufacturing process. The plasticity is found to be the main factor influencing the low cycle fatigue life of welded joint when suffering large strain. Besides, the two kind of welded joints exhibit excellent plasticity, which is advantageous to their fatigue life. In addition, comparing with forged steel of 30Cr2Ni4MoV, the elastic strain of the welded joint is greater than that of forging and the plastic strain is almost equal, provided that the fatigue life is the same. Generally, the two kind of welded joints have both similar cycle parameters and outstanding low cycle fatigue property.
出处
《热力透平》
2012年第4期256-260,共5页
Thermal Turbine
基金
上海市科学技术委员会上海市科技人才计划项目(11XD1421000)
