【作者】 李轶非； 蔡志鹏； 潘际銮； 刘霞； 乔尚飞； 沈红卫；

【Author】 LI Yifei 1,Cai Zhipeng 1,Pan Jiluan 1,Liu Xia 2,Qiao Shangfei 2,Shen Hongwei(1 Department of Mechanical Engineering,Tsinghua University,Beijing,100084) 2(2 Process Department of Turbine Works,Shanghai Electric Power Generation Equipment Co.,Ltd.Shanghai,200240)

【机构】 清华大学机械工程系； 上海汽轮机厂工艺处；

【摘要】 研究了汽轮机低压焊接转子用25Cr2Ni2MoV转子钢贝氏体焊缝韧性影响因素。对贝氏体焊缝进行不同温度下的冲击韧性试验,采用热模拟的方法重点研究焊缝层间区域。结果表明,焊缝整体冲击韧性良好。断口观察发现,层间局部区域呈现撕裂棱较多的准解理形貌,焊缝层间区域为韧性薄弱环节。进一步研究发现,裂纹扩展沿焊缝局部富碳区域中的M-A组元进行,M-A组元的存在为影响韧性的主要因素之一。更多还原

【Abstract】 The toughness weak points of bainitic weld of 25Cr2Ni2MoV LP welded rotor of steam turbine were found and studied.Impact toughness test of bainitic weld in different temperatures was taken.The method of thermal simulation was used to work over the welded layers.The experimental results of impact toughness show that the weld owns good toughness.The cracks propagate in unstable manner in the layers between two adjacent beads,and the fracture is quasi-cleavage fracture.So the inter layers are relatively weak in toughness.The further investigation shows that the cracks propagate along M-A constituents in the carbon-rich areas,M-A constituents are one of the major effecting factors to toughness.更多还原