提出了用非常规的圆截面小锥度光滑试样研究腐蚀疲劳(CF)裂纹扩展行为的新方法,即MST法(Multipe Small-angle-cone-specimen Test)。以黄铜在Mattson溶液中的腐蚀疲劳为例介绍了本方法的试验程序和结果。本方法所需要的试验装备简单、省时间、费用低,便于观察裂纹扩展与显微组织的关系,并且可测定多裂纹体系中表面裂纹朝纵深方向的扩展速率,在试验过程中不必停机及清洗试件使裂纹扩展的电化学环境和力学条件不受干扰,比较切合CF的真实情况。
Multiple Small-angle-cone-specimen Test (MST) was proposed for the investigation of corrosion fatigue crack growth. Corrosion fatigue of H68 brass in Mattsson solution was examined to illustrate the experimental procedure as well as results of the new method. Comparing with CT, CCT, WOL specimens and replica method, the new method showed several advantages: (1) Growth behavior of multitude surface cracks on different transverse sections can be examined simultaneously; (2) Both electrochemical environment and mechanical condition can be maintained during the test without disturbance; (3) It is convenient to study the relationship between crack growth path and micro-structure; (4) The experimental equipment required is easy to get. Both time and expenses can be saved for measurements.
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