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A new method to study the effect of M–A constituent on impact toughness of IC HAZ in Q690 steel

Published online by Cambridge University Press:  11 June 2015

Zhenshun Li ,
Lei Tian ,
Bin Jia  and
Shengli Li
Zhenshun Li*
Affiliation:
School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China; and Linyi Branch, Shandong Special Equipment Inspection Institute, Linyi 276007, People's Republic of China
Lei Tian
Affiliation:
School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
Bin Jia
Affiliation:
School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
Shengli Li*
Affiliation:
School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
*
a)Address all correspondence to this author. e-mail: lishengli@sdu.edu.cn
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Abstract

This paper details an investigation into the effect of martensite–austenite (M–A) constituent on impact toughness of intercritical heat-affected zone (IC HAZ) in Q690 steel, a low carbon bainitic steel. Large samples with uniform microstructure similar to that of the actual IC HAZ were achieved through combinations of heat treatments. The samples were heated to temperature between 750 and 830 °C for 30 min and then quenched in water. After these heat treatments, hard martensite islands distribute along the boundaries of soft matrix, and the size of martensite islands increases with heating temperature. The microstructure is quite similar to that of the IC HAZ. Using these large samples, the impact toughness could be measured conveniently. It was found that the embrittlement of the IC HAZ depends on the deformability and size of the M–A constituent. When the size of the M–A constituent whose deformability is low exceeds a critical value (2.0 μm), the embrittlement of the IC HAZ occurs.

Keywords

M–A constituentheat treatmentintercritical heat-affected zoneimpact toughness
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1973 - 1978
Copyright
Copyright © Materials Research Society 2015 

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References

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