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Restoration of impact properties of internal crack healing in a low carbon steel

机译：恢复低碳钢内部裂纹愈合的冲击性能

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摘要

In this paper, a new model of internal crack presetting was presented via a butt-joint and compression method. Restoration of impact properties of internal crack healing in a low carbon steel was investigated using a 300 J pendulum impact testing machine. The results show that impact properties of crack healing zone dramatically increase from 900 ℃ to 1000 ℃. Recrystallization in the crack healing zone promotes the rapid restoration of impact properties of internal crack healing. Percentage recovery of impact properties after crack healing treatment increases with increasing healing temperature and holding time in the temperature range 900-1100 ℃, while impact properties deteriorate at 1200 ℃ due to the formation of reticular ferrite and grain coarsening near the crack healing zone. Additionally, a new phenomenon is discovered: when internal cracks are disappeared completely, tensile properties of crack healing zones can be restored completely but their impact properties are only partially achieved. Post-fracture analysis indicates that in the initial healing stage the Charpy fracture exhibits massive brittle dimples and unhealed regions, and the ultimate fracture mode of the center region presents cleavage and ductile dimple mixed fracture.
机译：本文通过对接和压缩方法提出了一种新的内部裂纹预置模型。使用300 J摆锤冲击试验机研究了低碳钢内部裂纹愈合的冲击性能恢复。结果表明，裂纹愈合区的冲击性能从900℃急剧增加到1000℃。裂纹愈合区中的再结晶促进内部裂纹愈合的冲击性能的快速恢复。在900-1100℃的温度范围内，裂纹愈合后冲击性能的恢复百分率随修复温度的升高和保温时间的增加而增加，1200℃时冲击性能下降是由于裂纹愈合区附近网状铁素体的形成和晶粒的粗化。此外，发现了一种新现象：当内部裂纹完全消失时，裂纹恢复区的拉伸性能可以完全恢复，但其冲击性能只能部分实现。断裂后分析表明，夏比骨折在愈合的初期表现出块状脆性酒窝和未愈合的区域，而中心区域的最终断裂模式则表现为乳沟和韧性酒窝混合断裂。

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  • 来源
    《Materials Science and Engineering》 |2017年第13期|433-440|共8页
  • 作者

    Ruishan Xin; Qingxian Ma; Dongdong Guo; Weiqi Li;

  • 作者单位

    Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China,Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing 100084, China;

    Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China,Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing 100084, China;

    Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China,Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing 100084, China;

    Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China,Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing 100084, China;

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  • 正文语种 eng
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  • 关键词

    Restoration; Impact properties; Crack healing; Charpy fracture; Brittle dimple fracture; Cleavage and ductile dimple mixed fracture;

    机译：恢复;冲击性能;裂纹愈合;夏比骨折;酒窝脆性断裂;乳沟和延性酒窝混合骨折;

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