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Chinese Journal of Materials Research  2017, Vol. 31 Issue (7): 481-488    DOI: 10.11901/1005.3093.2017.159
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Cyclic Creep Behavior of 11.5CrNbTi and 15Cr0.5MoNbTi Ultra Pure Ferritic Stainless Steels
Caihong YING1,2, Lijia CHEN1(), Tianlong LIU1, Lianquan GUO2
1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2 School of Science, Shenyang University of Technology, Shenyang 110870, China
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Caihong YING, Lijia CHEN, Tianlong LIU, Lianquan GUO. Cyclic Creep Behavior of 11.5CrNbTi and 15Cr0.5MoNbTi Ultra Pure Ferritic Stainless Steels. Chinese Journal of Materials Research, 2017, 31(7): 481-488.

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Abstract  

Cyclic creep tests at 650°C for both 11.5CrNbTi and 15Cr0.5MoNbTi ultra pure ferritic stainless steels were conducted under the stress-controlled mode , the effect of hold time introduced at the maximum applied stress on the deformation and fracture behaviors of the ferritic stainless steels was investigated. The results show that with prolonging the hold time, the minimum cyclic creep rate increases, and the cyclic creep life and the cycle number to fracture decrease for both stainless steels. Under the same conditions, the cyclic creep resistance of the 15Cr0.5MoNbTi stainless steel is higher than that of the 11.5CrNbTi stainless steel. The cyclic creep fracture mode for two stainless steels is transgranular fracture. With prolonging the hold time, the quantity of creep voids increases and the effect of creep damage gets enhanced. The microstructures after the cyclic creep are composed of sub-grains. The deformation mechanism of cyclic creep is mainly the dislocation slip and cross slip.
Key words:  metallic materials      ultra pure ferritic stainless steel      cyclic creep      hold time      fracture mode      deformation mechanism     
Received:  02 March 2017     
ZTFLH:  TG142  
Fund: Supported by National Natural Science Foundation of China (No. 51134010)
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Caihong YING
Lijia CHEN
Tianlong LIU
Lianquan GUO

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.159     OR     https://www.cjmr.org/EN/Y2017/V31/I7/481

Steel Cr Mo Nb Ti C N Ni Mn Si Fe
11.5CrNbTi 11.5 ─ 0.19 0.16 ≤0.030 ≤0.020 ≤0.3 ≤1.0 ≤1.0 Bal.
15Cr0.5MoNbTi 15 0.5 0.45 0.3 ≤0.030 ≤0.020 ≤0.3 ≤1.2 ≤1.2 Bal.
Table 1  Chemical composition of the ferritic stainless steel(mass fraction, %)
Fig.1  Geometry of cyclic creep specimen (unit: mm)
Fig.2  Stress cycling waveform adopted in cyclic creep test
Fig.3  Cyclic creep curves of 11.5CrNbTi and 15Cr0.5MoNbTi stainless steels at maximum applied stress of 60 MPa (a-c), 70 MPa (d-f) and 80 MPa (g-i) with hold time of 10 min (a, d, g), 30 min (b, e, h) and 60 min (c, f, i)
Material σmax/ MPa th/min ε˙min/×10-4h-1 tf/h Nf/cycle
11.5CrNbTi 60 10 3.57 253.0 1508
30 3.72 171.9 343
60 4.19 131.2 131
70 10 7.49 71.6 427
30 8.71 65.7 131
60 9.00 54.1 54
80 10 10.67 45.0 269
30 10.73 37.1 74
60 11.90 29.1 29
15Cr0.5MoNbTi 60 10 0.57 429.8 2562
30 1.14 378.1 756
60 1.82 252.5 252
70 10 1.98 201.6 1209
30 2.56 149.3 298
60 3.68 102.1 102
80 10 3.16 84.2 502
30 5.21 65.1 130
60 6.89 43.0 43
Table 2  Results of cyclic creep tests for 11.5CrNbTi and 15Cr0.5MoNbTi stainless steels
Fig.4  Schematic precipitation pinning and dislocation bowing under inelastic mechanism
Fig.5  Crack propagation region of 11.5CrNbTi (a, b, c) and 15Cr0.5MoNbTi (d, e, f) stainless steel after cyclic creep at maximum applied stress of 60 MPa with hold time of 10 min (a, d), 30 min (b, e) and 60 min (c, f)
Fig.6  Crack propagation region of 11.5CrNbTi (a, b, c) and 15Cr0.5MoNbTi (d, e, f) stainless steel after cyclic creep at maximum applied stress of 80 MPa with hold time of 10 min (a, d), 30 min (b, e) and 60 min (c, f)
Fig.7  Microstructures of 11.5CrNbTi stainless steel before cyclic creep (a) and after cyclic creep at maximum applied stress of 80 MPa with hold time of 10 min (b), 30 min (c) and 60 min (d)
Fig.8  Microstructures of 11.5CrNbTi stainless steel after cyclic creep at maximum applied stress of 60 MPa and 70 MPa: (a) 60 MPa, 10 min hold time; (b) 70 MPa, 60 min hold time
Fig.9  Microstructures of 15Cr0.5MoNbTi stainless steel before cyclic creep (a) and after cyclic creep at maximum applied stress of 80 MPa with hold time of 10 min (b), 30 min (c) and 60 min (d)
Fig.10  Microstructures of 15Cr0.5MoNbTi stainless steel after cyclic creep at maximum applied stress of 60 MPa and 70 MPa: (a) 60 MPa, 10 min hold time; (b) 70 MPa, 60 min hold time
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