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本文利用 H-800透射电镜,在已研制成功的以奥氏体为基体的沉淀硬化A_1堆焊合金中,观察了裂纹的动态扩展.提出了在平面应力状态下,裂纹在奥氏体加部分莱氏体钢中扩展的模型.观察结果表明,在以奥氏体为基体的合金中,裂纹的扩展是通过在裂纹前沿诱发小裂纹并相互连接而进行的.裂纹的诱发位置,不仅在相界面,而且许多情况在裂纹尖端塑性区内的基体上,同时可以在前端连续发生,形成链节状诱发裂纹.在扩展过程中,遇到第二相时,有两种情况,知果第二相为共格相时绕行(即钻“空子”),而非共格相时,沿相界扩展.这一结果比较圆满地解释了以奥氏体为基体的合金的断裂现象,为研制新型耐热、耐磨合金提供了理论基础.
In this paper, H-800 transmission electron microscopy, in the successful development of austenite-based precipitation hardened A_1 surfacing alloy, the dynamic expansion of the crack was observed in the plane stress state, the crack in austenite plus part Lean steel. The observations show that in austenite-based alloys, crack propagation is induced by the initiation of small cracks at the crack front and interconnection. The location of the crack initiation, not only in phase Interface, and many cases in the crack tip plastic zone within the matrix, at the same time can be continuous at the front end, the formation of chain-like induced crack in the expansion process, when the second phase, there are two cases, known fruit second When the phase is coherent, the phase boundary (ie, “hole”) is drilled rather than the coherent phase and extends along the phase boundary. This result provides a more complete explanation of the fracture behavior of the austenite- For the development of new heat-resistant, wear-resistant alloy provides a theoretical basis.