摘要
在取自未服役与服役5万h HR3C钢管的拉伸试样上预制不同类型(V型、U型)、不同底部曲率半径(0.10,0.13,0.25,0.85mm)和不同长度(0.25,0.50,0.75,1.00mm)的缺口,通过拉伸试验研究了钢管的缺口敏感性。结果表明:未服役HR3C钢管无缺口敏感性,服役后钢管发生脆化,对缺口较为敏感;脆化态钢管对V型缺口的敏感性大于对U型缺口的,特别是对角度较大、底部曲率半径较小(0.10~0.25mm)、长度较长(0.50~1.00mm)的V型缺口较为敏感;当缺口应力集中系数大于3.5时,脆化态HR3C钢管的缺口敏感性较大。
Notches with different types(V,U),different root curvature radii(0.10,0.13,0.25,0.85 mm)and different length(0.25,0.50,0.75,1.00 mm)were pre-made in tensile samples from HR3 Csteel tube before and after service for 50000 h,and then the notch sensitivity of the steel tube was studied by tensile tests.The results show that the unserviced HR3 Csteel tube had no notch sensitivity.After service,the steel tube was embrittled,and therefore became sensitive to notches.The embrittled steel tube had higher sensitivity to the Vnotch than to the U-notch,especially being sensitive to the V-notches with a relatively large angle,relatively small root curvature radii(0.10-0.25 mm)and relatively long length(0.50-1.00 mm).When the stress concentration factor was greater than 3.5,the notch sensitivity of embrittled HR3 Csteel tube was high.
作者
宋利
SONG Li(Huazhong Electric Power Test Research Institute,China Datang Group Science and Technology Research Institute Co.,Ltd,Zhengzhou 450001,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2020年第2期13-17,共5页
Materials For Mechanical Engineering
关键词
HR3C钢管
脆化
拉伸性能
缺口敏感性
应力集中系数
HR3C steel tube
embrittlement
tensile property
notch sensitivity
stress concentration factor
