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Cyclic deformation and fatigue behaviors of Hadfield manganese steel

机译：哈德菲尔德锰钢的循环变形和疲劳行为

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摘要

The cyclic deformation characteristics and fatigue behaviors of Hadfield manganese steel have been investigated by means of its ability to memorize strain and stress history. Detailed studies were performed on the strain-controlled low cycle fatigue (LCF) and stress-controlled high cycle fatigue (HCF). Initial cyclic hardening to saturation or peak stress followed by softening to fracture occurred in LCF. Internal stress made the dominant contribution to the fatigue crack propagation until failure. Effective stress evolution revealed the existence of C-Mn clusters with short-range ordering in Hadfield manganese steel and demonstrated that the interaction between C atoms in the C-Mn cluster and dislocation was essential for its cyclic hardening. The developing/developed dislocation cells and stacking faults were the main cyclic deformation microstructures on the fractured sample surface in LCF and HCF, which manifested that fatigue failure behavior of Hadfield manganese steel was induced by plastic deformation during strain-controlled or stress-controlled testing.
机译：哈德菲尔德锰钢具有记忆应变和应力历史的能力，研究了其周期性变形特性和疲劳行为。对应变控制的低周疲劳（LCF）和应力控制的高周疲劳（HCF）进行了详细研究。 LCF中发生了最初的循环硬化，达到饱和或峰值应力，然后软化到断裂。内部应力是导致疲劳裂纹扩展直至失效的主要因素。有效的应力演化揭示了哈德菲尔德锰钢中短程有序的C-Mn团簇的存在，并表明C-Mn团簇中C原子之间的相互作用和位错对其循环硬化至关重要。 LCF和HCF断裂样品表面上主要的循环变形微观结构是位错单元的发育/发展，这表明哈德菲尔德锰钢的疲劳破坏行为是由应变控制或应力控制测试中的塑性变形引起的。

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