The fracture mechanism of W-Eurofer brazed joints was studied by in-situ SEM three-point bending tests using two different notched sample configurations. The objective of these tests was to analyze and understand the possible mechanical and fracture behavior of the joint during service life. The results showed that the mechanical behavior of this dissimilar brazed joint is very sensitive to defects on the tungsten side. When the notch is located in the tungsten base material, the stress concentration located in this material causes a fast crack propagation from the notch to W-braze interface, causing premature joint failure. However, when the notch is made in the Eurofer base material, the stronger Eurofer-braze interface and toughening behavior of the steel completely change the fracture mechanism, leading to improved mechanical behavior of the brazed joint.

W-Eurofer钎焊接头的断裂机理通过原位研究SEM三点弯曲测试，使用两种不同的带缺口样品配置。这些测试的目的是分析和了解使用寿命期间接头可能的机械和断裂行为。结果表明，这种不同的钎焊接头的机械性能对钨侧的缺陷非常敏感。当凹口位于钨基材料中时，位于该材料中的应力集中会导致从凹口到W钎焊界面的快速裂纹扩展，从而导致接头过早失效。但是，当在Eurofer基础材料上开槽时，较强的Eurofer-钎焊界面和钢的增韧行为完全改变了断裂机理，从而改善了钎焊接头的机械性能。