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Study on preheating and annealing treatments to biomimetic non-smooth cast iron sample with high thermal fatigue resistance

机译:高抗热疲劳仿生非光滑铸铁样品的预热和退火处理研究

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摘要

According to the previous studies, biomimetic non-smooth samples fabricated by laser melting had superior resistance to thermal fatigue compared with smooth sample. In order to improve the treating technology for biomimetic non-smooth surface of cast iron samples so as to enhance their thermal fatigue resistance further, preheating and annealing were applied in the procedure. Moreover, the effects of preheating and annealing treatments on the microstructure and microhardness of the biomimetic non-smooth units were also investigated. The results indicated that the cracks and holes in non-smooth units caused by laser processing could be avoided by preheating at an appropriate temperature, and the residual stresses in non-smooth units were eliminated largely through annealing. Of all samples tested, those preheated at 250℃ during laser processing and then annealed had the best thermal fatigue resistance.
机译:根据先前的研究,与光滑样品相比,通过激光熔化制成的仿生非光滑样品具有更好的抗热疲劳性能。为了改进仿生非光滑铸铁样品表面处理技术,以进一步提高其抗热疲劳性能,在该过程中进行了预热和退火处理。此外,还研究了预热和退火处理对仿生非光滑单元的组织和显微硬度的影响。结果表明,在适当的温度下进行预热可以避免激光加工引起的非光滑单元中的裂纹和孔洞,通过退火消除了非光滑单元中的残余应力。在所有测试样品中,在激光加工过程中预热至250℃,然后退火的样品具有最佳的抗热疲劳性能。

著录项

  • 来源
    《Materials Science and Engineering》 |2009年第2009期|294-301|共8页
  • 作者单位

    The Key Lab of Automobile Materials, The College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China The Research Center of Materials, QHD Weight Equipment Co. Ltd., Harbin Power Plant Equipment Cooperation, Qinhuangdao 066206, PR China;

    The Key Lab of Automobile Materials, The College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China;

    The Key Lab of Automobile Materials, The College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China;

    The Key Lab of Automobile Materials, The College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China;

    The Key Lab of Automobile Materials, The College of Materials Science and Engineering, Jilin University, Changchun 130025, PR China;

    The Key Lab of Terrain Machinery Bionics Engineering, The Ministry of Education, Jilin University, Changchun 130025, PR China;

    The Key Lab of Terrain Machinery Bionics Engineering, The Ministry of Education, Jilin University, Changchun 130025, PR China;

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

    thermal fatigue; preheating; annealing; biomimetic; non-smooth; cast iron;

    机译:热疲劳预热退火;仿生;不光滑铸铁;

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