Effect of Ms Temperature on Residual Stress in Welded Joints of High-Strength Steels
Effect of Ms Temperature on Residual Stress in Welded Joints of High-Strength Steels
复制标题
MS温度对高强钢焊接接头残余应力的影响
DOI：
10.1007/bf03263490
复制
发表时间：
2010
影响因子：
2.1
通讯作者：
H. Suzuki
中科院分区：
文献类型：
--
作者：
C. Shiga;H. Yasuda;K. Hiraoka;H. Suzuki
高强钢焊接接头焊后热应力受相变膨胀应力的影响很大，特别是焊缝金属低温区的马氏体相变。为了量化与热应力相关的残余应力的量，在具有Ms温度非常低的焊缝金属的焊接接头中进行中子衍射分析。在Ms温度约为60 °C的焊缝金属对接接头中，观察到焊缝中心处约为−400 MPa的压缩残余应力，焊趾处约为−75 MPa。残余应力分布与常规焊缝金属的残余应力分布有很大不同，常规焊缝金属的残余应力约为400-500 MPa。结合前人的研究成果，讨论了残余压应力的形成机理以及约束应力和应力诱发相变对残余压应力的影响。结果表明，在70 mm左右的焊缝长度范围内，低Ms焊缝金属引起的残余应力降低量约为11-15 MPa/单位长度。
Thermal stress in the weld joints of high-strength steels after welding receives a great influence of dilatation stress during phase transformation, especially martensitic transformation of the low temperature region in weld metal. In order to quantify the amount of residual stress linked with thermal stress, neutron diffraction analyses were carried out in the welded joints having weld metals with very reduced Ms temperatures. In the butt joint of weld metal with an Ms temperature of about 60 °C, compressive residual stresses of about −400 MPa at the weld centre and of about −75 MPa at the toe were observed. The residual stress distributions were quite different from those of conventional weld metals, which have a tensile residual stress of about 400–500 MPa. The formation mechanism of compressive residual stress and the effect of restraint stress and stress-induced transformation on it are discussed, including previous data. It can be concluded that the reduction amount of residual stress induced by low Ms weld metal is about 11–15 MPa per unit length within about 70 mm weld length.