摘要
对山西漳电蒲洲热电有限公司3号锅炉水冷壁开裂管样进行了几何尺寸测量、金相分析、硬度试验、拉伸性能试验、冲击性能试验及断口分析。结果表明:水冷壁开裂管样几何尺寸正常,化学成分、母材组织、拉伸性能、冲击吸收能量均符合标准要求,管样硬度超出标准要求的上限;3号炉水冷壁管弯管开裂应为安装过程中产生的,为大应力作用下的脆性开裂,应力来源为安装过程中水冷壁管与鳍片焊接产生的较大拘束应力;弯管部位硬度高、脆性大对开裂有促进作用。
Geometrical dimension measurement, metallographic analysis, hardness test, tensile property test, impact property test and fracture analysis are carried out on the cracked tube samples of the water cooling wall of No. 3 Boiler in Shanxi Zhangdian Puzhou Thermal Power Co., Ltd. The results showed that the geometrical size of the cracked tube samples is normal;the chemical composition, base material structure, tensile property and shock absorption energy all met the standard requirements, but the hardness of the tube samples exceeded the upper limit of the standard requirements. Thus the bend cracking of water cooling wall tube of No.3 Boiler should have occurred in the installation process, which is brittle cracking under the action of large stress. The source of the stress is the comparatively large constraint stress caused by the welding of water cooling wall tube and the fin during the installation process, and the high hardness and brittleness of the bending part can promote the cracking.
作者
邵志强
SHAO Zhiqiang(Shanxi Zhangdian Puzhou Thermal Power Co”Ltd.,Yuncheng,Shanxi 044500,China)
出处
《山西电力》
2020年第2期58-61,共4页
Shanxi Electric Power
关键词
水冷壁管
脆性开裂
应力
硬度
water cooling wall tube
brittle cracking
stress
hardness
