S141 Residual Stresses and In-Situ Measurement of Phase Transformation in Low Transformation Temperature (LTT) Welding Materials
S141 Residual Stresses and In-Situ Measurement of Phase Transformation in Low Transformation Temperature (LTT) Welding Materials
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S141 低转变温度 (LTT) 焊接材料中的残余应力和相变现场测量
DOI：
10.1154/1.2951824
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发表时间：
2008
影响因子：
0.5
通讯作者：
J. Gibmeier
中科院分区：
文献类型：
--
作者：
T. Kannengiesser;A. Kromm;M. Rethmeier;J. Gibmeier
在这项研究中进行的调查，使用创新的高强度填充材料，特别是降低Ms/Mf温度已经证明，不同的转变温度可能会显着影响焊接残余应力。首次应用高能同步辐射技术，通过能谱衍射原位研究了马氏体起始温度降低对焊接残余应力的影响。这样同样可以确定相变温度。利用同步加速器白色束衍射，在同一实验中分析了马氏体和奥氏体相中的相特异性残余应力。研究了镍含量在8%~ 12%之间变化的低相变温度焊接材料。使用高强度基材S690，采用手工电弧焊，在两个焊道中产生对接焊缝。对焊缝纵向和横向的残余应力进行了分析。结果清楚地表明，残余应力分布一般表现出由焊缝金属的相变引起的幅度减小。特别是在从焊缝金属到热影响区的过渡区中，在马氏体相中确定了高达-350 MPa的相对高的压缩残余应力。奥氏体相中的应力大小和分布受镍含量和相关残余奥氏体量的强烈影响。
The investigations carried out in this study using innovative high strength filler materials with specifically lowered Ms/Mf-temperatures have demonstrated that different transformation temperatures may significantly affect the welding residual stresses. For this kind of filler materials for the first time high energy synchrotron radiation was applied in order to characterise the effect of lowered martensite start temperatures on the welding residual stresses in-situ by means of energy dispersive diffraction. This way likewise the phase transformation temperatures could be determined. Using synchrotron white beam diffraction the phase-specific residual stresses in the martensitic and the austenitic phase were analysed within the same experiment. Low transformation temperature welding material with varying nickel content between 8 % and 12 % was investigated in this study. Butt welds using the high strength base material S690 applying manual metal arc welding were produced in two passes. Residual stress analysis was carried out in longitudinal as well as transverse direction to the weld line. The results clearly indicate that the residual stress distributions show in general a decrease in magnitude caused by phase transformation of the weld metal. Particularly in the transition region from the weld metal to the heat affected zone relatively high compressive residual stresses up to -350 MPa were determined in the martensitic phase. The stress magnitude and distribution in the austenitic phase is strongly influenced by the nickel content and the amount of associated retained austenite.