Effect of laser clad repair on the fatigue behaviour of ultra-high strength AISI 4340 steel

Sun, Shoujin; Liu, Qianchu; Brandt, Milan; Luzin, Vladimir; Cottam, Ryan; Janardhana, Madabhushi; Clark, Graham

doi:10.1016/j.msea.2014.03.077

Cited by 123 publications

(35 citation statements)

References 21 publications

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“…Regarding this, the heat treatment (HT) was adopted, so that the LSFed microstructure of 300M steel became uniform to significantly improve the tensile strength to meet the forgings standard . Similar results were also presented in LSFed 1Cr12Ni2WMoVNb steel and AISI4340 steel . However, the elongation and percentage reduction of area of LSFed HSLA steels were still low through HT .…”

Section: Introductionsupporting

confidence: 83%

Austenitizing Behavior of Laser Solid Formed Ultrahigh-Strength 300 M Steel

Liu

Lin

Song

et al. 2017

steel research int.

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The influence of austenitizing treatment on the microstructure and mechanical properties of laser solid formed (LSFed) 300M steel is investigated within the austenitizing temperature range of 870–1050 °C. It is found that the dendritic segregation in 300M steel deposits (formed in the laser solid forming) gradually reduces with the increase of the austenitizing temperature, and even completely disappears when the austenitizing temperature reaches 1050 °C. Besides, the austenite grains and martensite packets in the LSFed 300M steel deposits changes little when the austenitizing temperature rises from 870 to 950 °C, but significantly coarsenes at the austenitizing temperature above 950 °C. The tensile test shows that the tensile strength of the samples reaches 2325 MPa after austenitizing heat treatment at 870 °C and, then, decreases slightly with the increase of the austenitizing temperature. For yields strength, it decreases slightly when the austenitizing temperature reaches 870–950 °C, while sharply decreases when the austenitizing temperature is above 950 °C. Moreover, a little effect of austenitizing temperature on the elongation and percentage reduction of area of the LSFed 300M steel is exhibited.

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Section: Introductionsupporting

confidence: 83%

Austenitizing Behavior of Laser Solid Formed Ultrahigh-Strength 300 M Steel

Liu

Lin

Song

et al. 2017

steel research int.

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“…Compared with conventional thermal spraying, vacuum brazing, TIG welding, MIG welding and other rehabilitation technologies, laser cladding repairing technique can not only be used to produce metallurgically well-bonded coating with small heat-affected-zone (HAZ), fine microstructures and minimal distortion [1][2], but also produce repaired coatings with special physical and chemical properties, such as wear resistance, corrosion resistance, anti-oxidation, anti-fatigue and so on [3][4][5][6]. Typical classification of laser cladding is related with the real-time application of the precursor material: preplaced coating or injection of precursor material of coating.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and mechanical properties of multiple-layer laser cladding coating of 308L stainless steel

Liu

et al. 2015

Applied Surface Science

130

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“…Tempered martensite broadly appears darker compared to the un-tempered martensite in an etched sample [22]. Martensite tempering due to laser heating for deposition of successive layers resulted in decomposition of martensite into ferrite and cementite [11]. Thus, the microhardness in the overlap zone of the specimen is lower compared to that of the hardness for non-overlap zone.…”

Section: Cracksmentioning

confidence: 95%

Extreme High-Speed Laser Material Deposition (EHLA) of AISI 4340 Steel

Zhang

Bultel

et al. 2019

Coatings

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A variant of conventional laser material deposition (LMD), extreme high-speed laser material deposition (German acronym: EHLA) is characterized by elevated process speeds of up to 200 m/min, increased cooling rates, and a significantly reduced heat affected zone. This study focuses on the feasibility of using EHLA to apply material onto Fe-based substrate materials with AISI 4340 as a filler material. We studied how three different build-up strategies-consisting of one, three, and five consecutive deposited layers and hence, different thermal evolutions of the build-up volume-influence the metallurgical characteristics such as microstructure, porosity, hardness, and static mechanical properties. We propose a thermo-metallurgical scheme to help understand the effects of the build-up strategy and the thermal evolution on the microstructure and hardness. The tensile strength of the build-up volume was determined and is higher than the ones of forged AISI 4340 material.Coatings 2019, 9, 778 2 of 16 layer and substrate. The applied powder particles bond to the substrate by mechanical clamping, which leads to tensile residual stresses and reduces the fatigue life of the deposited layers. Wu et al. [7] studied the feasibility of repairing AISI 4340 components through friction stir processing (FSP). In this study filling blocks were used as filling material. The filler blocks were first fixed to the substrate by electron beam welding, then the filler blocks were joined to the material to be repaired using a friction stirrer. The results showed no defects in the repaired zone. The measured maximum tensile strength was 91.8% compared to that of a forged structure and a ductile-brittle fracture was observed.LMD has also widely been used to repair parts made of this low-alloy steel. LMD can be used to repair and functionalize surfaces thanks to its advantages, such as the metallurgical bonding between the deposited layer and the substrate [8], the defined and well controlled energy deposition [9], and the reduced heat affected zone (HAZ) [10]. Shi et al. [11] used laser cladding as a repair process for AISI 4340. They investigated the tensile strength of the samples after cladding. The specimens were prepared by adding a notch with the dimensions of 13.73 mm in length and 0.7 mm in thickness to the center of a plate-shaped substrate, and filling the notch with the AISI 4340 filler by LMD. Then, the excess cladded layer was removed by a CNC machine to generate a flat surface finish. The specimens were taken out from the plate and machined by wire cutting. Tensile test results indicated that the elongation of the specimen was 0.6%. An explanation for the brittleness was given by the detection of untempered martensite in the cladded area and the HAZ zone, which leads to high hardness and low ductility and toughness. Chew et al. [12] investigated the fatigue performance after cladding AISI 4340 on substrates out of the same material. The authors prepared the specimens by adding a pre-clad groove, filling the groove with AISI 43...

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Effect of laser clad repair on the fatigue behaviour of ultra-high strength AISI 4340 steel

Cited by 123 publications

References 21 publications

Austenitizing Behavior of Laser Solid Formed Ultrahigh-Strength 300 M Steel

Austenitizing Behavior of Laser Solid Formed Ultrahigh-Strength 300 M Steel

Microstructure evolution and mechanical properties of multiple-layer laser cladding coating of 308L stainless steel

Extreme High-Speed Laser Material Deposition (EHLA) of AISI 4340 Steel

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