Softening of High-Strength Steel for Laser Assisted Clinching
Softening of High-Strength Steel for Laser Assisted Clinching
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DOI：
10.4028/www.scientific.net/amr.966-967.617
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
J. Osten;Paul Söllig;M. Reich;J. Kalich;U. Füssel;O. Kessler
中科院分区：
文献类型：
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作者：
J. Osten;Paul Söllig;M. Reich;J. Kalich;U. Füssel;O. Kessler
目前，钢材的常规铆接仅限于抗拉强度低于 800 N/mm2，断裂伸长率高于 14%。为了实现高强度钢的铆接，可以在接头处对板材进行局部加热，以提高延展性。因此，应保持接头外部的材料特性。这可以通过短时激光加热来实现。对模压硬化钢22MnB5 的短时回火行为进行了分析。通过变形膨胀仪中的热机械分析研究了短时间热处理期间的机械性能。由此，应建立激光辅助铆接，并产生有效的形状闭合和力闭合连接。结果，模压硬化钢 22MnB5 首次可以通过激光辅助进行铆接。
The conventional clinching of steels is currently limited to tensile strength less than 800 N/mm2 and to elongation at fracture more than 14 %. To realise the clinching of high-strength steels, the sheet can be heated locally at the joint, to improve ductility. Thereby the material characteristics outside the joint should be maintained. This could be achieved by means of short-time laser heating. The short-time tempering behaviour of press hardened steel 22MnB5 has been analysed. The mechanical properties during a short-time heat treatment were investigated by thermo-mechanical analysis in a deformation dilatometer. Thereby laser-assisted clinching shall be established and an efficient form-closed and force-closed connection shall be produced. As a result, the press hardened steel 22MnB5 could be clinched by laser assistance for the very first time.