Crack Propagation Behavior during DWTT for X80 Pipeline Steel Processed via Ultra-fast Cooling Technique

doi:10.11901/1005.3093.2016.055

Chinese Journal of Materials Research

2017, Vol. 31

Issue (10): 728-736 DOI: 10.11901/1005.3093.2016.055

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Crack Propagation Behavior during DWTT for X80 Pipeline Steel Processed via Ultra-fast Cooling Technique

Jinhua ZHAO¹, Xueqiang WANG^1,², Jian KANG¹, Guo YUAN¹(

), Hongshuang DI¹

1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
2 Shougang Qian'an Iron&Steel Co., Ltd, Qian'an 064404, China

Cite this article:

Jinhua ZHAO, Xueqiang WANG, Jian KANG, Guo YUAN, Hongshuang DI. Crack Propagation Behavior during DWTT for X80 Pipeline Steel Processed via Ultra-fast Cooling Technique. Chinese Journal of Materials Research, 2017, 31(10): 728-736.

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Abstract

The microstructure and crystallographic features of X80 pipeline steel of 18.4 mm in thickness, which was prepared by ultra-fast cooling (UFC) technique, were characterized by means of optical microscope, electron scanning microscopy, and EBSD technique. The performance of the steel by drop weight tear test (DWTT) was investigated in terms of the crack propagation and the morphology of fractured surfaces, while the mechanism related with the crack arresting ability of the steel resulted from UFC treatment was revealed . The results show that the microstructure of the steel is primarily composed of AF, CB, and M/A island, and the area fractions of AF and CB are ~83%, and ~17%, respectively. The effective grain size is ~3.5 μm, and the fraction of high-angle boundary is ~40.9%. The steel with higher fractions of AF and small-sized M/A island possesses smaller effective grain size, which is beneficial to the crack arresting ability of the steel. The mechanisms related to the enhancement of the crack arresting property may be ascribed to that the UFC promots the formation of AF, and increases the amount of small-sized M/A island by increasing cooling rate. Additionally, the variant selection during bainite transformation is weakened by UFC. Thus, the effective grain size is decreased, and the density of high-angle boundary is increased.

Key words: microstructure structure defects and properties ultra-fast cooling AF transformation X80 pipeline steel crack arresting mechanism

Received: 13 January 2016

ZTFLH:

TG142

Fund: Supported by National Science-technology Support Plan Projects of China (No.2012BAF04B01), and National Natural Science Foundation of China (No.51504063)

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	Jinhua ZHAO
	Xueqiang WANG
	Jian KANG
	Guo YUAN
	Hongshuang DI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.055 OR https://www.cjmr.org/EN/Y2017/V31/I10/728

Table 1 Chemical composition of experimental steel (%, mass fraction)

Fig.1 Schematic diagram of DWTT specimen

Fig.2 Schematic diagram of observation section for crack propagation

Fig.3 Microstructural characterization at mid-thickness (a) optical micrograph; (b) morphological micrograph

Fig.4 EBSD analysis data of experimental steel (a) orientation distribution map; (b) distribution of grain boundary; (c) distribution of misorientation between different grains; (d) variation trend of misorientation along Line 1, and Line 2

Fig.5 Crystallization relationship between different AF (a) orientation distribution map and (b) pole figure of {001}

Table 2 Crystallographic orientation relationship of different grains showing in Fig.5a

Table 3 Mechanical Properties of experimental steel

Fig.6 DWTT fracture of studied X80 pipeline steel

Fig.7 Fracture of DWTT residual sample of studied X80 hot strip: (a)-(d) corresponds to P1 to P4

Fig.8 Crack propagation path at initiation and transition process

Fig.9 Crack propagation path at stable fracture zone

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