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

Ma, Chengyong; Wu, Zhiquan; Qi, Yanchang; Zhang, Xin

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

Materials Science-Poland

Volume 41 (2023): Issue 1 (March 2023)

By:

Chengyong Ma, Zhiquan Wu, Yanchang Qi and Xin Zhang

Open Access

|Aug 2023

Figures & Tables

Schematic diagram of multi-layer welding

Location of deposited metal impact and tensile specimens

Sketch map of tensile samples processing

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

Holding temperature of heat treatment at 740°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

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

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

Average impact toughness of deposited metalheat treatment curves

Average hardness of deposited metal-heat treatment curves

Fiber fracture rate of deposited metals-heat treatment curve

Impact fracture morphology at tempered 740°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

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

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

Relationship between impact toughness of weld and t8/5

Relationship between hardness of weld and t8/5

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

DOI: https://doi.org/10.2478/msp-2023-0005 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331

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Language: English

Page range: 124 - 139

Submitted on: Aug 11, 2021

Accepted on: Oct 28, 2022

Published on: Aug 4, 2023

Published by: Sciendo

In partnership with: Paradigm Publishing Services

Publication frequency: 4 times per year

Keywords:

Related subjects:

Materials sciences, other,

Nanomaterials,

Functional and smart materials,

Materials characterization and properties

© 2023 Chengyong Ma, Zhiquan Wu, Yanchang Qi, Xin Zhang, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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

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The chemical composition of welding wires (wt%)

The chemical composition of deposited metal (wt%)

Fiber fracture rate of deposited metals

Welding parameters

Paradigm

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