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首页> 外文期刊>Journal of Materials Engineering and Performance >Ductile Damage and Fatigue Behavior of Semi-Finished Tailored Blanks for Sheet-Bulk Metal Forming Processes
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Ductile Damage and Fatigue Behavior of Semi-Finished Tailored Blanks for Sheet-Bulk Metal Forming Processes

机译：钣金成型过程中半成品量身定制的毛坯的延性损伤和疲劳行为

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摘要

To produce parts from sheet metal with thickened functional elements, bulk forming operations can be employed. For this new process class, the term sheet-bulk metal forming has been established recently. Since sheet-bulk metal forming processes such as orbital forming generates triaxial stress and strain states, ductile damage is induced in the form of voids in the microstructure. Typical parts will experience cyclic loads during service, and thus, the influence of ductile damage on the fatigue life of parts manufactured by orbital forming is of interest. Both the formation and growth of voids were characterized following this forming process and then compared to the as-received condition of the ferritic deep drawing steel DC04 chosen for this study. Subsequent to the forming operation, the specimens were fatigued and the evolution of ductile damage and the rearrangement of the dislocation networks occurring during cyclic loading were determined. It was shown, that despite an increased ductile damage due to the forming process, the induced strain hardening has a positive effect on the fatigue life of the material. However, by analyzing the fatigued specimens a development of the ductile damage by an increasing number of voids and a change in the void shape were detected.
机译：为了从具有加厚的功能元件的金属薄板生产零件，可以采用整体成型操作。对于这种新的工艺类别，最近已经建立了术语“块状金属成型”。由于诸如轨道成形之类的大块金属成形过程会产生三轴应力和应变状态，因此会在微结构中以空隙的形式诱发延性破坏。典型零件在使用期间会承受周期性载荷，因此，延性损坏对通过轨道成形制造的零件的疲劳寿命的影响是令人关注的。在此成形过程之后，对空隙的形成和生长都进行了表征，然后将其与本研究中选择的铁素体深冲钢DC04的现状相比较。成形操作之后，使试样疲劳，并确定在循环加载过程中发生的韧性损伤的演化和位错网络的重排。结果表明，尽管由于成形过程而增加了延展性破坏，但诱发的应变硬化却对材料的疲劳寿命产生积极影响。然而，通过分析疲劳的样品，检测到由于增加的空隙数量导致的延展性破坏的发展以及空隙形状的变化。

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