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Open AccessArticle

The Effects of Homogenizing and Quenching and Tempering Treatments on Crack Healing

by Yao Qiu 1,2, Ruishan Xin 3,4, Jianbin Luo 1,2 and Qingxian Ma 1,2,*
1
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
2
Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Tsinghua University, Beijing 100084, China
3
Ansteel Beijing Research Institute, Beijing 102211, China
4
HBIS Group Technology Research Institute, Shijiazhuang 050023, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(4), 427; https://doi.org/10.3390/met10040427 (registering DOI)
Received: 29 February 2020 / Revised: 16 March 2020 / Accepted: 24 March 2020 / Published: 25 March 2020
After thermal deformation and heat treatment, it can be observed that there are small, newly formed grains in the crack healing zone, which indicates that the internal crack is fully healed. However, in our previous study, the impact properties of the internal healing zone could only be partially healed. In this study, the process of homogenizing treatment was adopted to achieve grain size homogeneity. The effects of homogenizing treatment and quenching and tempering treatment on crack healing were also systematically analyzed. With the same heat treatment method, SA508-3 samples, which were subjected to multi-pass deformation, had a higher percentage recovery than those that underwent uniaxial compression. The percentage recovery of the crack healing zone was significantly improved after the process of homogenizing treatment. The impact property of the crack healing zone could be fully restored after homogenizing treatment followed by quenching and tempering treatment. However, after several episodes of heating, the grain-boundary strength decreased, and the impact value was relatively low.
Keywords: crack healing; impact property; homogenizing treatment; quenching and tempering treatment crack healing; impact property; homogenizing treatment; quenching and tempering treatment
MDPI and ACS Style

Qiu, Y.; Xin, R.; Luo, J.; Ma, Q. The Effects of Homogenizing and Quenching and Tempering Treatments on Crack Healing. Metals 2020, 10, 427.

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