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Effect of heat treatment and cooling rate on microstructure and properties of T92 welded joint

Chengyong Ma
Chengyong Ma
, 
Zhiquan Wu
Zhiquan Wu
, 
Yanchang Qi
Yanchang Qi
 e 
Xin Zhang
Xin Zhang
   | 04 ago 2023
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Pubblicato online: 04 ago 2023
Pagine: 124 - 139
Ricevuto: 11 ago 2021
Accettato: 28 ott 2022
DOI: https://doi.org/10.2478/msp-2023-0005
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© 2023 Chengyong Ma et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Schematic diagram of multi-layer welding
Schematic diagram of multi-layer welding

Fig. 2.

Location of deposited metal impact and tensile specimens
Location of deposited metal impact and tensile specimens

Fig. 3.

Sketch map of tensile samples processing
Sketch map of tensile samples processing

Fig. 4.

Size of thermal expansion sample
Size of thermal expansion sample

Fig. 5.

Deposited metal microstructure: a-50 μm, b-20 μm
Deposited metal microstructure: a-50 μm, b-20 μm

Fig. 6.

Holding temperature of heat treatment at 740°C: (a) 2 h, (b) 4 h, (c) 8 h
Holding temperature of heat treatment at 740°C: (a) 2 h, (b) 4 h, (c) 8 h

Fig. 7.

Holding temperature of heat treatment at 760°C: (a) 2 h, (b) 4 h, (c) 8 h
Holding temperature of heat treatment at 760°C: (a) 2 h, (b) 4 h, (c) 8 h

Fig. 8.

Holding temperature of heat treatment at 800°C: (a) 2 h, (b) 4 h, (c) 8 h
Holding temperature of heat treatment at 800°C: (a) 2 h, (b) 4 h, (c) 8 h

Fig. 9.

Second phase of deposited metal: (a) Tempering area, (b) Non-tempering area
Second phase of deposited metal: (a) Tempering area, (b) Non-tempering area

Fig. 10.

Average impact toughness of deposited metalheat treatment curves
Average impact toughness of deposited metalheat treatment curves

Fig. 11.

Average hardness of deposited metal-heat treatment curves
Average hardness of deposited metal-heat treatment curves

Fig. 12.

Fiber fracture rate of deposited metals-heat treatment curve
Fiber fracture rate of deposited metals-heat treatment curve

Fig. 13.

Impact fracture morphology at tempered 740°C: (a) 2 h, (b) 4 h, (c) 8 h
Impact fracture morphology at tempered 740°C: (a) 2 h, (b) 4 h, (c) 8 h

Fig. 14.

Impact fracture morphology at tempered 760°C: (a) 2 h, (b) 4 h, (c) 8 h
Impact fracture morphology at tempered 760°C: (a) 2 h, (b) 4 h, (c) 8 h

Fig. 15.

Impact fracture morphology at tempered 800°C: (a) 2 h, (b) 4 h, (c) 8 h
Impact fracture morphology at tempered 800°C: (a) 2 h, (b) 4 h, (c) 8 h

Fig. 16.

Microstructure morphology of weld simulation t8/5: (a) 5 s, (b) 10 s, (c) 20 s, (d) 70 s
Microstructure morphology of weld simulation t8/5: (a) 5 s, (b) 10 s, (c) 20 s, (d) 70 s

Fig. 17.

Relationship between impact toughness of weld and t8/5
Relationship between impact toughness of weld and t8/5

Fig. 18.

Relationship between hardness of weld and t8/5
Relationship between hardness of weld and t8/5

Fig. 19.

Impact fracture morphology of thermal simulation t8/5: (a) 5 s, (b) 10 s, (c) 20 s, (d) 70 s
Impact fracture morphology of thermal simulation t8/5: (a) 5 s, (b) 10 s, (c) 20 s, (d) 70 s

The chemical composition of welding wires (wt%)

C Mn Nb B Ni Cr N Si Mo W V
0.100 0.890 0.0350 0.003 0.680 8.790 0.073 0.220 0.780 1.570 0.200

The chemical composition of deposited metal (wt%)

C Mn Nb B Ni Cr N Si Mo W V
0.099 1.010 0.033 0.004 0.660 8.338 0.070 0.180 0.68 1.310 0.170

Fiber fracture rate of deposited metals

Tempering temperature (°C) Holding time (h) Fiber fracture rate /%
T = 2h T = 4h T = 8h
740 Measured value 20; 22; 24 36; 37; 41 82; 83; 86
Average value 22 38 84
760 Measured value 35; 35; 43 52; 54; 51 48; 55; 50
Average value 84 86 89
780 Measured value 86; 84; 88 87; 85; 86 89; 88; 85
Average value 86 86 87

Welding parameters

Welding Beads Welding current/A Welding voltage/V Welding speed/(cm·min–1) Interlayer temperature/°C Heat input/KJ/cm
1 250 12 14 25 12.86
2 250 12 14 96 12.86
3 250 12 14 170 12.86
4 250 12 14 226 12.86
5 250 12 14 240 12.86
6 250 12 14 190 12.86
7 250 12 14 190 12.86
8 250 12 14 190 12.86
– – – – – –
28 250 12 14 190 12.86
29 250 12 14 190 12.86
30 250 12 14 190 12.86
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