Effect of Deep Cryogenic Treatment on the Microstructure and the Corrosion Resistance of AZ61 Magnesium Alloy Welded Joint

Gong, Xiaoyuan; Wu, Zhaohui; Fang, Zhao

doi:10.3390/met7050179

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…Ramesh et al [24] measured an improvement of 69% in the corrosion resistance of rebar steel following DCT due to the increase of the perlite phase. Gong et al [25] improved the corrosion resistance to NaCl via an immersion test of AZ61 magnesium alloy welded joints after deep cryogenic treatment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cryogenic Treatment on Wear Resistance and Microstructure of AISI A8 Tool Steel

Jimbert¹,

Iturrondobeitia²,

Ibarretxe³

et al. 2018

Metals

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The effects of deep cryogenic treatment (DCT) on the wear behavior of different tool steels have been widely reported in the scientific literature with uneven results. Some tool steels show a significant improvement in their wear resistance when they have been cryogenically treated while others exhibit no relevant amelioration or even a reduction in their wear resistance. In this study, the influence of DCT was investigated for a grade that has been barely studied in the scientific literature, the AISI A8 air-hardening medium-alloy cold work tool steel. Several aspects were analyzed in the present work: the wear resistance of the alloy, the internal residual stress, and finally the secondary carbide precipitation in terms of lengths and occupied area and its distribution into the microstructure. The results revealed a reduction in the wear rate of about 14% when the AISI A8 was cryogenically treated before tempering. The number of carbides that precipitated into the microstructure was 6% higher for the cryogenically treated samples, increasing from 0.68% to 0.73% of the total area they covered. Furthermore, the distribution of the carbides into the microstructure was more homogenous for the cryogenically treated samples. Author Contributions: Methodology, P.J.; Investigation, P.J.; Project administration, P.J.; Writing-original draft, P.J.; Software, M.I.; Data curation, M.I. and J.I.; Validation, R.F.-M.; Writing-review and editing, R.F.-M. and J.I.

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Section: Introductionmentioning

confidence: 99%

Influence of Cryogenic Treatment on Wear Resistance and Microstructure of AISI A8 Tool Steel

Jimbert¹,

Iturrondobeitia²,

Ibarretxe³

et al. 2018

Metals

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“…Deep Cryogenic Treatment (DCT) exerts a significant influence on both the grain morphology of welded joints and the precipitation of phases [27,28]. Given that these precipitates exert a strong impact on the properties of aluminum alloy, a variety of characterization methods, including SEM, XRD, EDS, and TEM, are employed to identify and distinguish these precipitates.…”

Section: Effect Of Dct On Precipitatesmentioning

confidence: 99%

Effect on microstructure and mechanical properties of friction stir welded 5A06 aluminum alloy joints by deep cryogenic treatment

Du,

Qiao,

Wang

et al. 2024

Mater. Res. Express

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In order to improve the comprehensive mechanical properties of the welded joints of the 5A06 aluminum alloy, friction stir welded (FSW) joints were subjected to deep cryogenic treatment (DCT). The microstructure and mechanical properties were characterised using metallographic microscopy, X-ray diffractometer (XRD), energy spectrometer, microhardness tests, and tensile tests. The experimental results show that DCT refines the structure significantly due to the large temperature difference. This refinement results from an increase in Mg atoms within the α-Al solid solution through the precipitation of Al atoms, forming the Al3Mg2 phase. This enhancement in plasticity is achieved through dispersion distribution. Moreover, as the treatment time of DCT increases, the mechanical properties of the welded joint also improve significantly. With an extended treatment time of DCT, the microhardness of the welded joints reaches its peak, leading to an average microhardness increase of up to 6.9% compared to welded joints without DCT. Additionally, the tensile properties of the welded joints reach 385.3MPa, marking a 7.4% increase in tensile strength compared to joints without DCT. These experimental results underscore the significant impact of DCT on improving the welded joints.

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“…The more refined α-grains and strengthening precipitates (Mg 17 Al 12 ) are the reasons for the higher hardness in the DCT as compared with the SCT. Gong et al [42] reported that the DCT improved the hardness in the fusion and HAZ regions of AZ61 Mg welded joints. Even though cryogenic treatment the HAZ region shows inferior hardness when compared to all the SZ regions and it may be due to the presence of eutectic phase.…”

Section: Microhardness Studies Of Fsw and Post Cryogenic Treated Jointsmentioning

confidence: 99%

Influence of Post Weld Cryogenic Treatment on the Ballistic Penetration Resistance of Friction Stir-Welded AZ31B Magnesium Alloy

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Influence of post weld cryogenic treatment conditions (deep and shallow) on the ballistic resistance of friction stir welded (FSW) AZ31B magnesium alloy has been investigated. AZ31B welded joints which were prepared by using friction stir welding process were subjected to two types of cryogenic treatment conditions. The microstructural investigation of cryogenic treated joints showed the formation of Mg17Al12 precipitates and conversion of coarse eutectic phase into thin discontinues phase along with halos. In addition, superior microhardness values were noticed for the cryogenically treated joints compared with non-treated joints and base metal. High velocity ballistic experiments were conducted on cryogenically treated and non-treated weld targets using 7.62 mm deformable projectiles at an initial velocity of 450 ± 10 m/s. At the stir zone, the depth of penetration (DOP) of the projectile into the deep cryogenic treated (DCT) target was observed to be 11% and 34 % lesser than the shallow cryogenic treated (SCT) and FSW targets. Thus increase in the ballistic resistance was observed for the post-weld cryogenic treated FSW joints compared to non-treated FSW joints. SEM investigation of the projectile impacted DCT targets showed the formation of cracks, dimples and micro voids at the crater region. It is also noticed that, the Stir Zone (SZ) and Heat Affected Zones (HAZ) of the DCT target has effectively absorbed the ballistic impact energy of the projectile by a ductile fracture and hence DCT can be used to improve the ballistic penetration resistance of the FSW joints at the SZ and HAZ regions.

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Effect of Deep Cryogenic Treatment on the Microstructure and the Corrosion Resistance of AZ61 Magnesium Alloy Welded Joint

Cited by 13 publications

References 9 publications

Influence of Cryogenic Treatment on Wear Resistance and Microstructure of AISI A8 Tool Steel

Influence of Cryogenic Treatment on Wear Resistance and Microstructure of AISI A8 Tool Steel

Effect on microstructure and mechanical properties of friction stir welded 5A06 aluminum alloy joints by deep cryogenic treatment

Influence of Post Weld Cryogenic Treatment on the Ballistic Penetration Resistance of Friction Stir-Welded AZ31B Magnesium Alloy

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