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Metals 2016, 6(11), 256; doi:10.3390/met6110256

The Role of the Bainitic Packet in Control of Impact Toughness in a Simulated CGHAZ of X90 Pipeline Steel

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1,2,* and 1,2
1
Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2
National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
3
Research and Development Center of WISCO, Wuhan 430080, China
*
Author to whom correspondence should be addressed.
Academic Editor: Soran Birosca
Received: 3 September 2016 / Revised: 17 October 2016 / Accepted: 20 October 2016 / Published: 27 October 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
View Full-Text   |   Download PDF [4908 KB, uploaded 27 October 2016]   |  

Abstract

X90 pipeline steel was processed with the simulated coarse grain heat affect zone (CGHAZ) thermal cycle with heat input varying from 30 kJ/cm to 60 kJ/cm, the microstructures were investigated by means of optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD), and transmission electron microscope (TEM), and the impact properties were evaluated from the welding thermal cycle treated samples. The results indicate that the microstructure is primarily composed of lath bainite. When decreasing the heat input, both bainite packet and block are significantly refined, and the toughness has an increased tendency due to the grain refinement. The fracture surfaces all present cleavage fracture for the samples with different heat inputs. Moreover, the average cleavage facet size for the CGHAZ is nearly equal to the average bainite packet size, and the bainitic packet boundary can strongly impede the crack propagation, indicating that the bainitic packet is the most effective unit in control of impact toughness in the simulated CGHAZ of X90 pipeline steel. View Full-Text
Keywords: coarse grain heat affected zone (CGHAZ); impact toughness; bainitic packet; EBSD; cleavage facet coarse grain heat affected zone (CGHAZ); impact toughness; bainitic packet; EBSD; cleavage facet
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MDPI and ACS Style

Guo, B.; Fan, L.; Wang, Q.; Fu, Z.; Wang, Q.; Zhang, F. The Role of the Bainitic Packet in Control of Impact Toughness in a Simulated CGHAZ of X90 Pipeline Steel. Metals 2016, 6, 256.

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