METAL ALLOYS FOR FASTENERS OF HYBRID JOINTS

Abstract

The characteristics of metal alloys used for manufacturing fasteners for hybrid joints are considered. Alloys that can be used in the manufacturing embedded elements when creating hybrid joints are recommended as following: alloy steels (30ХГСА, 12Х18Н10Т), aluminum (Д16, В95) and titanium alloys (BT1, BT5, BT6, etc.). The peculiarities of their strengthening heat treatment were analyzed, the influence of polymer binder formation process on the properties of metal elements of transverse or longitudinal joints was considered. Practical recommendations are given on the use of metal alloys as fastening elements of hybrid joints: when creating a hybrid joint for manufacturing embedded elements, it is recommended to use the following alloys – alloy steels (30ХГСА, 12Х18Н10Т), aluminum alloys (D16, B95), titanium alloys (ВТ1, ВТ5, ВТ6 etc.). If the curing temperature of polymer binder is 200 C and above, then it is recommended to use alloyed steels, titanium alloys as a material for manufacturing transversal or longitudinal joining elements; if the hardening temperature of polymer binder is up to 150 C, it is recommended to use aluminum alloys as a material for manufacturing transversal or longitudinal joining elements. To improve mechanical properties of alloy steels, aluminum and titanium alloys it is necessary to carry out heat treatment – quenching and tempering for steels; quenching and natural aging or quenching and artificial aging for aluminum alloys; annealing or quenching and artificial aging for titanium alloys. Before the introduction of metal elements into the composite structure, they must be heated to ensure easier penetration of fastening elements into composite.