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Chinese Journal of Materials Research  2018, Vol. 32 Issue (1): 33-41    DOI: 10.11901/1005.3093.2016.791
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Fracture Behavior of Thick X80 Pipeline Steel Plates at -25℃
Liang HONG1, Xiurong ZUO1(), Yinglun JI1, Ge MA1, Junyuan DONG1, Lei CHEN2
1 School of Physical Engineering, Key Laboratory of Materials and Physics (Zhengzhou University), Ministry of Education, Zhengzhou 450052, China
2 School of Mechatronic Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450052, China
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Liang HONG, Xiurong ZUO, Yinglun JI, Ge MA, Junyuan DONG, Lei CHEN. Fracture Behavior of Thick X80 Pipeline Steel Plates at -25℃. Chinese Journal of Materials Research, 2018, 32(1): 33-41.

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Abstract  

The effect of microstructure on tearing fracture behavior for thick plates of X80 pipeline steel was assessed at -25 oC by means of drop-weight tear tester (DWTT),as well as optical microscopy and scan electron microscopy (SEM). The result shows that the volume fraction of acicular ferrite reduced gradually in the thickness direction and reached a minimum level at the center of the plate, whilst more volume fraction of granular bainite (GB), polygonal-like ferrite (PF) and quasi-polygonal-like ferrite (QF) appeared. The higher volume fraction of acicular ferrite of the plate is, the larger tearing share area will be. In addition, the existence of PF and QF, and large size martensite-austenite (MA) could lead to the initiation of cleavage crack, and reduce the fracture toughness of the plate. During the crack propagation process, microstructures near the main crack deformed and elongated seriously, but the hard and brittle MA can hardly deform, resulting in the growth of voids and formation of micro cracks. The secondary crack is always reflected by or arrested on acicular ferrite boundaries, which demonstrates that the acicular ferrite has good toughness, and thereby retards the crack propagation effectively.
Key words:  metallic materials      pipeline steel      X80      drop-weight tear test      fracture behavior      microstructure     
Received:  30 December 2016     
ZTFLH:  TG142.1  
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Liang HONG
Xiurong ZUO
Yinglun JI
Ge MA
Junyuan DONG
Lei CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.791     OR     https://www.cjmr.org/EN/Y2018/V32/I1/33

C Mn P S Si Ni+Cr+Cu+Mo Nb+Ti
0.05 1.54 0.010 0.001 0.25 0.386 0.056
Table 1  Chemical compositions of the X80 pipeline steels (%, mass fraction)
Fig.1  Shape and dimensions of DWTT specimen
Fig.2  Optical fractographs of DWTT specimens at -25oC
Sample Share area/% Ductile fracture area/% Initial cleavage
fracture area/%		 Inverse cleavage
fracture area/%
1# 91 86.2 1.2 12.6
2# 67 56.1 25.7 18.2
Table 2  Area fraction of fracture area of the DWTT specimens (tested at -25oC)
Fig.3  Band structures of the 1# and 2# specimens in different thickness (a, c) 1/4 thickness and 1/2 thickness of 1# specimen; (b, d) 1/4 thickness and 1/2 thickness of 2# specimen
Fig.4  SEM micrographs of the 1# and 2# specimens in different thickness (a, c, e) surface, 1/4 thickness and 1/2 thickness of 1# specimen; (b, d, f) surface, 1/4 thickness and 1/2 thickness of 2# specimen
Sample Position AF/% GB/% PF+QF/% BF/% MA/%
1# Surface 79.97 10.07 3.54 — 6.42
1/4 thickness 76.16 8.75 6.20 — 8.89
1/2 thickness 58.59 18.44 9.37 2.91 10.69
Average 71.57 12.42 6.37 0.97 8.67
2# Surface 71.62 5.74 11.07 0.9 10.67
1/4 thickness 72.81 8.05 7.70 1.0 10.44
1/2 thickness 54.61 20.25 15.30 2.0 7.84
Average 66.35 11.34 11.35 1.30 9.65
Table 3  Volume fraction of AF, GB, PF+QF, and MA in the X80 pipeline steels
Fig.5  Optical micrographs of MA constituents of the 1# and 2# specimens in different thickness (a, c, e) surface, 1/4 thickness and 1/2 thickness of 1# specimen; (b, d, f) surface, 1/4 thickness and 1/2 thickness of 2# specimen
Fig.6  The size distribution of MA constituents of the 1# and 2# specimens (a) the number of MA constituents on per unit area; (b) the number fraction of MA constituents with different size
Fig.7  SEM micrographs of the crack propagation and microstructure beneath the DWTT specimen (a) distribution of microstructures and voids; (b) high magnification images of the area in Fig.a; (c) main crack and microstructure around cleavage fracture region; (d) voids and micro cracks around the region of share lip
Fig.8  SEM micrographs of the secondary crack beneath the main crack of DWTT specimen (a) crack propagate through MA island and defect at grain boundary; (b) crack propagate in AF; (c) crack terminated around AF and MA island
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