Assessment of hot cracking behaviour in welds
Assessment of hot cracking behaviour in welds
复制标题
焊缝热裂纹行为评估
DOI：
10.3139/146.110545
复制
发表时间：
2011
影响因子：
0.8
通讯作者：
B. Redmer
中科院分区：
文献类型：
--
作者：
T. Kannengiesser;M. Rethmeier;P. Portella;U. Ewert;B. Redmer
摘要金属材料生产加工过程中的热裂纹评定是保证焊接结构安全的必要前提。这里提出的热裂纹调查进行了一项研究的一部分，旨在开发的Cr/Ni低转变温度填料材料。低相变温度合金为焊接高强度钢提供了可能性。在所描述的实验中采用了外部加载的改进的可变横向约束热裂纹试验。借助于施加在试样表面的光学显微镜来评价抗热裂性。热裂敏感性和Cr/Ni合金含量之间的比例关系被解释为改变凝固动力学和由扩大的凝固间隔。内部裂纹路径和三维结构的材料体积中的裂纹网进行了检查，使用X射线计算机断层扫描。确定了不同材料深度和不同外接矩形体积下的裂纹总长度。随着Cr/Ni合金含量的增加，试样体积的热裂纹敏感性也增加。
Abstract Hot crack assessment during production and processing of metallic materials is an essential prerequisite for the safety of welded structures. The hot cracking investigations presented here were carried out as part of a study aimed at the development of Cr/Ni low transformation temperature filler materials. Low transformation temperature alloys open up the possibility for welding high strength steels. The externally loaded Modified Varestraint Transvarestraint hot cracking test was employed in the experiments described. The hot cracking resistance was evaluated with the help of light microscopy applied at the specimen surface. The proportionality between hot cracking susceptibility and Cr/Ni alloy content was explained by the altered solidification kinetics and by the enlarged solidification interval. The internal crack paths and the three-dimensional structure of the crack net in the material volume were examined using X-ray computer tomography. The total crack lengths for different material depths and circumjacent rectangular volumes, respectively, were be determined. An increasing hot cracking susceptibility with increasing Cr/Ni alloy content was also be established for the specimen volume.