本文用金相显微镜和扫描电镜对 Ti-5Al-2.5Sn 合金在近中性3.5%NaCl 水溶液中 SCC 裂纹形核带的微观形貌进行了观察。通过金相显微镜、透射电镜、X 光衍射仪和离子探针等手段对 SCC断口的研究,证明了 SCC 裂纹尖端生成的氢确实进入了钛合金基体,并且裂纹前端最大三向应力区域形成了 fct 型和 bcc 型氢化物沉淀,导致了 SCC 的快速发展。在实验事实的基础上,对 SCC 过程中氢的来源、输运、氢起作用的位置,以及内氢的作用等问题进行了讨论。
The micro-morphology of the initiation zone of SCC of Ti-5A1-2.5Sn alloy in 3.5% NaCl solution has been inspected by OM and SEM.A study of the SCC crack's details by OM,TEM,X-ray diffractometer and ion microanaly- zer has also been made.Based upon the results of these experiments,it is pro- ved that the hydrogen generated during SCC has really penetrated into the metal matrix,then concentrated at the maximum of triaxial stress in front of the crack tip,and precipitated as hydride particles of fct and bee lattice, resulting in rapid development of SCC.The source,transportation and acting position of hydrogen,as well as the role of internal hydrogen in SCC of tita- nium alloy have been discussed.
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