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首页> 外文期刊>Materials Science and Engineering >Low-cycle fatigue behaviors of two heats of SA508 Gr.la low alloy steel in 310℃ air and deoxygenated water-Effects of dynamic strain aging and microstructures
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Low-cycle fatigue behaviors of two heats of SA508 Gr.la low alloy steel in 310℃ air and deoxygenated water-Effects of dynamic strain aging and microstructures

机译：SA508 Gr.la低合金钢在310℃空气和脱氧水中两次加热的低周疲劳行为-动态应变时效和微观组织的影响

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摘要

The low cycle fatigue (LCF) resistances of two heats of SA508 Gr.la low alloy steel, heat FP with a ferrite-pearlite microstructure and heat BA with a bainite microstructure, were compared in 310℃ air and deoxygenated water. The LCF life of heat FP was shorter than that of heat BA in 310℃ deoxygenated water while the LCF life of both heats was comparable in 310℃ air. Such behaviors were explained considering the dynamic strain aging (DSA) behaviors in both environments and their microstructures. Based on cyclic stress and tensile behaviors, it was found that heat BA showed higher degree of DSA than heat FP in 310℃ air, but both showed similar degree of DSA in 310℃ deoxygenated water because the degree of DSA was reduced by absorbed hydrogen. In case of microstructure, heat FP had a lower fatigue cracking resistance due to the stress concentration effect in ferrite-pearlite interface. As a result, in 310℃ air, where the effect of DSA was large enough to override the microstructure effect, LCF life of heat BA was similar to that of heat FP. On the other hand, LCF life of heat BA was longer than that of heat FP in 310℃ deoxygenated water, where the effect of DSA was not so significant.
机译：在310℃的空气和脱氧水中，比较了SA508 Gr.la低合金钢的两种热，具有铁素体-珠光体组织的FP和具有贝氏体组织的BA的低循环疲劳强度。在310℃的脱氧水中，FP的LCF寿命短于BA的LCF寿命，而在310℃的空气中，两种热量的LCF寿命相当。考虑了在两种环境及其微结构中的动态应变老化（DSA）行为，对此类行为进行了解释。根据循环应力和拉伸行为，发现在310℃空气中，热BA的DSA程度高于热FP，但在310℃的脱氧水中，热BA的DSA程度相近，因为被吸收的氢降低了DSA的程度。在微结构的情况下，由于铁素体-珠光体界面中的应力集中效应，热FP具有较低的抗疲劳裂纹性。结果，在310℃的空气中，DSA的影响足够大以至可以抵消微观结构的影响，热量BA的LCF寿命类似于热量FP的LCF寿命。另一方面，在310℃的脱氧水中，热BA的LCF寿命比热FP的LCF寿命长，而DSA的影响不那么显着。

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  • 来源
    《Materials Science and Engineering》 |2013年第15期|41-50|共10页
  • 作者

    Hun Jang; Jeong-Hyeon Kim; Changheui Jang; Jae Gon Lee; Tae Soon Kim;

  • 作者单位

    Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro. Yuseong-gu, Daejeon, 305-701, Republic of Korea;

    Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro. Yuseong-gu, Daejeon, 305-701, Republic of Korea;

    Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro. Yuseong-gu, Daejeon, 305-701, Republic of Korea;

    Central Research Institute, Korea Hydro and Nuclear Power Co., Ltd., 1312 Gil, 70. Yuseongdaero, Yuseong-gu, Daejeon, 305-343, Republic of Korea;

    Central Research Institute, Korea Hydro and Nuclear Power Co., Ltd., 1312 Gil, 70. Yuseongdaero, Yuseong-gu, Daejeon, 305-343, Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Low alloy steels; Low cycle fatigue; Dynamic strain aging; Deoxygenated water; Bainite; Ferrite-pearlite;

    机译：低合金钢;低周疲劳;动态应变时效;脱氧水;贝氏体铁素体珠光体;

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