刘敏
,
王勇
,
刘广瑞
,
唐慕尧
,
孟繁森
中国腐蚀与防护学报
采用数值模拟和残余应力实测方法,研究水冷法改善1Cr18Ni9Ti奥氏体不锈钢管和20钢圆管的多层对焊残余应力分布的有效性。结果表明水冷法可有效调整圆管的焊接残余应力分布,使圆管内表面的焊接缝附近区域获得双向压缩残余应力。应力腐蚀敏感性实验结果表明,水冷法可显著提高焊接圆管的抗应力腐蚀性能。
关键词:
圆管
,
Welded joint
,
Water cooling method
,
Stress corrosion
,
Residual stress distribution
Kaijin HUANG
,
Dawen ZENG
,
Changsheng XIE
,
Desheng XU
材料科学技术（英）
A 3D unsteady state numerical model of heat transfer in the circumferential laser oxygen cutting of pipes was developed. In order to minimize the computing time required for solving the finite difference equations as much as possible, the alternating direction implicit (ADI) method was adopted. Based on the characteristics of the pipe cutting process, the periodic boundary condition was applied to calculate the temperature distribution in the θ direction and the self-adaptive grid technology was also used. The mathematical model takes account of the temperature-dependent thermal properties of the pipe. The calculated kerfs width and the heat-affected zone (HAZ) were compared with the experimental results.
关键词:
Laser cutting
,
null
,
null
