Fracture Toughness of Weld Metal of 440 MPa Grade High-strength Steel

doi:10.11901/1005.3093.2023.164

Chinese Journal of Materials Research

2024, Vol. 38

Issue (2): 151-160 DOI: 10.11901/1005.3093.2023.164

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Fracture Toughness of Weld Metal of 440 MPa Grade High-strength Steel

ZENG Daoping¹^,², AN Tongbang¹(

), ZHENG Shaoxian², DAI Haiyang¹, CAO Zhilong¹, MA Chengyong¹

^1.Welding Research Institute of Iron and Steel Research Institute, Beijing 100081, China
^2.School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Cite this article:

ZENG Daoping, AN Tongbang, ZHENG Shaoxian, DAI Haiyang, CAO Zhilong, MA Chengyong. Fracture Toughness of Weld Metal of 440 MPa Grade High-strength Steel. Chinese Journal of Materials Research, 2024, 38(2): 151-160.

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Abstract

Weld joints of 440 MPa grade high-strength steel were prepared via metal active-gas welding technique with a homemade Si-Mn-Ni gas-shielded solid welding wire as filler. Then the fracture toughness of the weld metals was studied by impact test, fatigue crack growth rate test, and crack tip opening displacement test at different temperatures, aiming to clarify the relation of microstructure and fracture toughness, so that to provide data support for the engineering application of the welding wire. The results show that the ductile-brittle transition temperature of the weld metal is about -48.4^oC; With the increase of constant amplitude load (13~17 kN), the number of load cycles(N) and the fatigue life decreases continuously. Moreover, when the stress intensity factor range (ΔK) keeps the same, the fatigue crack growth rate (da/dN) decreases gradually with the increase of constant amplitude load; The CTOD value (δ) of weld metal is 0.481~0.781 mm, the effective characteristic value (δ_0.2BL) is 0.5103 mm, and the dispersion coefficient of CTOD value(δ) is only 16.5%, The weld metal has good fracture toughness and meets the technical requirements of marine engineering; Acicular ferrite has the strong ability to block crack propagation, thus improving fracture toughness, while quasi-polygonal ferrite has the weak ability to block crack propagation and M-A constituent is easy to induce microcracks, thus reducing fracture toughness.

Key words: metallic materials 440 MPa grade high-strength steel weld metal fracture toughness microstructure

Received: 16 March 2023

ZTFLH:

TG442

Corresponding Authors: AN Tongbang, Tel: 18201639982, E-mail: anran30002000@sina.com

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	ZENG Daoping
	AN Tongbang
	ZHENG Shaoxian
	DAI Haiyang
	CAO Zhilong
	MA Chengyong

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.164 OR https://www.cjmr.org/EN/Y2024/V38/I2/151

Table 1 Chemical composition of test plate and solder wire (mass fraction,%)

Table 2 Mechanical properties of test plate and weld metal

Fig.1 Schematic diagram of test palte specification

Fig.2 Location diagram of organization observation and performance test (a) organization observation, (b) performance tests

Fig.3 Dimension diagram of CT sample and CTOD sample (a) CT sample, (b) CTOD sample

Fig.4 Photos of weld metal microstructure (a) columnar crystal (OM), (b) columnar crystal (TEM), (c) interpass (OM), (d) interpass (TEM)

Fig.5 Photos of M-A constituent and microhardness in weld metal (a) columnar crystal, (b) interpass, (c) microhardness

Table 3 Impact absorption energy of series temperature

Fig.6 Boltzmann function fitting curve

Fig.7 Impact fracture morphology (a) -40^oC, (b) -60^oC

Fig.8 a-N curve and da/dN-ΔK curve for different constant amplitude loads (a) a-N curve, (b) da/dN-ΔK curve

Table 4 Results of fatigue crack growth rate tests

Fig.9 Fracture morphology for different constant amplitude loads (a) ealy stage of 13 kN, (b) intermediate stage of 13 kN, (c) later stage of 13 kN, (d) ealy stage of 17 kN, (e) intermediate stage of 17 kN, (f) later stage of 17 kN

Table 5 Original crack length

Table 6 Termination crack length

Table 7 Results of CTOD tests

Fig.10 Resistance curve of δ-Δa

Fig.11 Fracture morphology of CTOD sample (a) micromorphology, (b) prefabricated fatigue crack zone, (c) fatigue crack growth zone, (d) secondary fatigue crack zone, (e) impact fracture zone

Fig.12 Crack propagation morphology on the longitudinal section of the imapact fracture at -40^oC (a) schematic diagram of observation position, (b) effect of AF on main crack growth, (c) high magnification image of the area in Fig.b, (d) secondary crack propagation in AF, (e) effect of QF on crack growth; (f) high magnification image of the area in Fig.e, (g) M-A constituent induced microcrack

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