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Chinese Journal of Materials Research  2018, Vol. 32 Issue (8): 561-566    DOI: 10.11901/1005.3093.2018.107
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Small Size Specimen Evaluation Method for Fracture Toughness KIC of High Strength Steel
Qiqiang DUAN1,2, Bin WANG2, Peng ZHANG1,2(), Ruitao QU1,2(), Zhefeng ZHANG1,2
1 University of Chinese Academy of Sciences, Beijing 100049, China.
2 Materials Fatigue and Fracture Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
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Qiqiang DUAN, Bin WANG, Peng ZHANG, Ruitao QU, Zhefeng ZHANG. Small Size Specimen Evaluation Method for Fracture Toughness KIC of High Strength Steel. Chinese Journal of Materials Research, 2018, 32(8): 561-566.

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Abstract  

ABSTRAT In the present study, the 0Cr13Ni8Mo2Al precipitation hardening high strength steel was selected as the experimental material, and the fracture morphologies and the relevant mechanisms of fracture toughness specimens with different sizes were studied. Results show that, according to the difference of fracture mechanisms, the tensile fracture region of fracture toughness specimens can be divided into crack slow propagation zone (cleavage zone) and fast propagation zone (dimple zone); and the fracture energy is mainly consumed in the crack slow propagation zone. A small size specimen evaluation method for fracture toughness KIC was established in this study, and the relative error between the fracture toughness KIC value obtained with this method and that with the standard specimen is 9%. This means that the fracture toughness KIC value of the metallic materials obtained with the small size specimen evaluation method is very reliable.
Key words:  metallic materials      high strength steel      small size specimen      fracture mechanisms      fracture toughness KIC     
Received:  16 January 2018     
ZTFLH:  TG142  
Fund: Supported by National Natural Science Foundation of China (Nos. 51331007, U1664253 & 51771205)
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Qiqiang DUAN
Bin WANG
Peng ZHANG
Ruitao QU
Zhefeng ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.107     OR     https://www.cjmr.org/EN/Y2018/V32/I8/561

Materials Yield strength,
σy /MPa		 Fracture toughness,
KIC /MPam1/2		 Thickness,
B/mm		 Maximum load required for test, Fmax /kN
CM400 2583 32 0.38 0.04
40CrNiMoA 1334 90 11.4 16.4
30SiMn2MoVA 1216 113 21.6 53.8
14MnMoNbB 834 159 90.9 653.6
30Cr2MoV 549 148 181.7 1719.4
18MnMoNiCr 490 276 793.2 29246.5
Table 1  Mechanical properties of several steels[4, 5] and conditions required for fracture toughness KIC test
Serial number Thickness,
B/mm		 Width,
W/mm		 Span,
S/mm
B25 25.07 50.07 200
B12-1 11.97 23.99 96
B12-2 12.02 24.03 96
B8-1 7.99 16.02 64
B8-2 8.04 16.10 64
B6-1 6.03 12.00 48
B6-2 6.03 12.03 48
B4-1 4.04 8.00 32
B4-2 4.01 8.07 32
Table 2  Dimensions of fracture toughness specimens
Serial number Pre-crack length, a /mm FQ /kN KQ /MPam1/2 Whether to satisfy the criterion (Yes/No)
B25 26.35 57.02 118 Yes
B12-1 11.78 20.14 113 No
B12-2 11.91 18.53 105 Yes
B8-1 7.71 9.42 93 No
B8-2 7.83 9.56 95 No
B6-1 6.05 5.66 92 No
B6-2 6.21 3.79 64 No
B4-1 4.06 2.78 84 No
B4-2 4.56 1.74 63 No
Table 3  The experimental results of fracture toughness
Fig.1  Force-displacement curves of fracture specimens with different dimensions
Fig.2  Macroscopic fracture morphologies of fracture toughness specimens with different dimensions (a) B4; (b) B6; (c) B8; (d) B12; (e) B25
Fig.3  Microscopic fracture morphologies of fracture toughness specimens
Fig.4  Schematic of fracture surface for crack slow propagation region
Fig.5  Relationship between the specimen thickness (B) and KQ
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