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Solidification Cracking Assessment of LTT Filler Materials by Means of Varestraint Testing and µCT

机译：用变压试验和µCT评估LTT填充材料的凝固裂纹

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摘要

Investigations of the weldability of metals often deal with hot cracking, as one of the most dreaded imperfections during weld fabrication. The hot cracking investigations presented in this paper were carried out as part of a study on the development of low transformation temperature (LTT) weld filler materials. These alloys allow to mitigate tensile residual stresses that usually arise during welding using conventional weld filler materials. By this means, higher fatigue strength and higher lifetimes of the weld can be achieved. However, LTT weld filler materials are for example, high-alloyed Cr/Ni steels that are susceptible to the formation of hot cracks. To assess hot cracking, we applied the standardized modified varestraint transvarestraint hot cracking test (MVT), which is well appropriate to evaluate different base or filler materials with regard to their hot cracking susceptibility. In order to consider the complete material volume for the assessment of hot cracking, we additionally applied microfocus X-ray computer tomography (µCT). It is shown that by a suitable selection of welding and MVT parameter the analysis of the complete 3D hot crack network can provide additional information with regard to the hot cracking model following Prokhorov. It is now possible to determine easy accessible substitute values (e.g., maximum crack depth) for the extent of the Brittleness Temperature Range (BTR) and the minimum critical strain .
机译：金属的可焊性研究经常涉及热裂纹，这是焊缝制造过程中最可怕的缺陷之一。本文介绍的热裂纹研究是对低相变温度（LTT）焊接填充材料的开发进行研究的一部分。这些合金可以减轻通常在使用传统焊缝填充材料进行焊接过程中产生的拉伸残余应力。通过这种方式，可以获得更高的疲劳强度和更长的焊接寿命。但是，LTT焊接填充材料例如是易产生热裂纹的高合金Cr / Ni钢。为了评估热裂，我们应用了标准的改进型varestraint跨变应变热裂测试（MVT），该测试非常适合于评估不同基础或填充材料的热裂敏感性。为了考虑评估热裂痕的完整材料量，我们另外应用了微焦点X射线计算机断层扫描（µCT）。结果表明，通过适当选择焊接和MVT参数，对完整3D热裂纹网络的分析可以提供有关遵循Prokhorov的热裂纹模型的其他信息。现在可以确定脆性温度范围（BTR）和最小临界应变的容易获得的替代值（例如，最大裂纹深度）。

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