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首页> 外文期刊>Journal of Materials Research >Low-cycle fatigue behavior and life prediction of fine-grained 316LN austenitic stainless steel
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Low-cycle fatigue behavior and life prediction of fine-grained 316LN austenitic stainless steel

机译：细粒度316LN奥氏体不锈钢的低循环疲劳行为和寿命预测

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摘要

Grain refinement has been applied to enhance the materials strength for miniaturization and lightweight design of nuclear equipment. It is critically important to investigate the low-cycle fatigue (LCF) properties of grain refined 316LN austenitic stainless steels for structural design and safety assessment. In the present work, a series of fine-grained (FG) 316LN steels were produced by thermo-mechanical processes. The LCF properties were studied under a fully reversed strain-controlled mode at room temperature. Results show that FG 316LN steels demonstrate good balance of high strength and high ductility. However, a slight loss of ductility in FG 316LN steel induces a significant deterioration of LCF life. The rapid energy dissipation in FG 316LN steels leads to the reduction of their LCF life. Dislocations develop rapidly in the first stage of cycles, which induces the initial cyclic hardening. The dislocations rearrange to form dislocations cell structure resulting in cyclic softening in the subsequent cyclic deformation. Strain-induced martensite transformation appears in FG 316LN stainless steels at high strain amplitude (△∈/2 = 0.8%), which leads to the secondary cyclic hardening. Moreover, a modified LCF life prediction model for grain refined metals predicts the LCF life of FG 316LN steels well.
机译：谷物改进已应用，以提高核设备小型化和轻质设计的材料强度。探讨谷物精制316LN奥氏体不锈钢的低循环疲劳（LCF）性能进行结构设计和安全评估是至关重要的。在本作工作中，通过热机械过程生产一系列细粒粒细粒（FG）316LN钢。在室温下在完全反转的应变控制模式下研究了LCF性能。结果表明，FG 316LN钢展示了高强度和高延展性的良好平衡。然而，FG 316LN钢中的延展性的轻微损失会导致LCF寿命的显着劣化。 FG 316LN钢中的快速耗散导致其LCF寿命的减少。位错在循环的第一阶段迅速发展，这诱导了初始环状硬化。脱位重新排列以形成脱位细胞结构，导致随后的循环变形中的环状软化。应变诱导的马氏体转化出现在高应变幅度的FG 316LN不锈钢中（△△/ 2 = 0.8％），这导致二次环状硬化。此外，用于晶粒精制金属的改进的LCF寿命预测模型预测FG 316LN钢的LCF寿命。

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  • 来源
    《Journal of Materials Research》 |2020年第24期|3180-3191|共12页
  • 作者

    Zhe Zhang; An Li; Yanping Wang; Qiang Lin; Xu Chen;

  • 作者单位

    School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China;

    School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China;

    School of Chemical Engineering Inner Mongolia Polytechnic University Hohhot 010051 China;

    School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China;

    School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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