Effect of laser reheat post-treatment on the microstructural characteristics of laser-cladded ultra-high strength steel

Rashid, Rizwan Abdul Rahman; Nazari, Keivan A.; Barr, Cameron; Palanisamy, Suresh; Orchowski, Nicholas; Matthews, Neil; Dargusch, Matthew S.

doi:10.1016/j.surfcoat.2019.05.021

Cited by 40 publications

(14 citation statements)

References 28 publications

(36 reference statements)

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“…In all cases, the microhardness of the CL is higher than that of the substrate. As shown in Figure e, the microhardness of the HAZ near the CL–substrate interface is quite high (≈400 HV 0.2 ), which is attributed to the martensite laths formed during cooling . Moving from the CL–substrate interface to the substrate, the microhardness of the HAZ, which is composed of coarse bainite and ferrite (shown in Figure f), decreases sharply to 160 HV 0.2 .…”

Section: Resultsmentioning

confidence: 91%

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Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

Liu

Huang

Bao

et al. 2020

steel research int.

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Herein, single-pass laser-cladded 2205 duplex stainless steel is fabricated on the surface of Q235 carbon steel at different laser powers in the range of 1.7À2.7 kW. The relationships between laser powers and geometrical characteristics, microstructure, microhardness, and corrosion resistance of the cladded layers (CLs) are analyzed. The results show that with the increase in laser power, the width and height of the bead increase, and the dilution rate and depth of the molten pool also significantly increase. Furthermore, the shape of ferrite gradually transforms from coarse to slender and eventually turns into a discontinuous vermicular shape. It is found that the CL obtained at a laser power of 2.3 kW has higher average microhardness and exhibits better corrosion resistance than the other samples (%20 times better than that of the carbon steel substrate), with its corrosion potential and corrosion current density of À0.146 V and 0.13 μA cm À2 , respectively.

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Section: Resultsmentioning

confidence: 91%

“…Therefore, each area of the CL exhibits a different microstructure. Due to the heat input during the laser cladding process, the HAZ has undergone significant microstructural changes . As shown in Figure e, acicular martensite and coarse ferrite replace the ferrite and pearlite in the original substrate.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

Liu

Huang

Bao

et al. 2020

steel research int.

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“…Measurements were undertaken in two cross-sections of each specimen (e.g., 1.1. and 1.2. for Specimen 1). Rahman Rashid et al [56] proved that decreasing hardness can result from tempered martensite occurring in the HAZ. The same results were observed during our investigation.…”

Section: Hardness Hv10 Measurementsmentioning

confidence: 99%

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Tomków

Janeczek

2020

Applied Sciences

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In this paper the influence of in situ local heat treatment performed by additional stitches on the weldability of high-strength low-alloy (HSLA) S355J2C+N steel was tested. The investigated steel is characterized by high susceptibility to cold cracking. It is necessary to find a method to improve the quality of welded joints. The local heat treatment was applied as an effect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made by the use of covered electrodes in the water environment. For testing weldability, Tekken test specimens were made. Then, the different number of the pad welds with different overlapping were laid on the face of the tested welds. Non-destructive (NDT) visual and penetrant tests were undertaken. During the NDT, imperfections like shape mistakes and spatters were found. Then, metallographic macro- and microscopic testing were performed. The macroscopic observations proved that water environment can generate imperfections like cracking and pores. However, for specimens with additional stitches the number of imperfections decreased. Microscopic tests proved that the proposed technique affected the structure of the heat-affected zone (HAZ). The specimens without the application of additional stitches are characterized by brittle bainitic and martensitic structure. Specimens, in which the additional stitches were applied, contain tempered martensite, fine ferrite and fine pearlite in their HAZ. It was also observed that the number of cracks decreased for in situ local heat-treatment specimens. The final step was Vickers HV10 hardness measurement. These measurements confirmed previous results. The heat from additional stitches affected the steel by significantly decreasing the hardness by 80–100 HV10. The results of experiments showed that the heat from pad welds provided microstructural changes in heat-affected zones and a decrease in the susceptibility to cold cracking, which results in improvement in the weldability of HSLA steel in wet welding conditions.

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“…In the laser cladding process, there are a series of complex physical and chemical reactions. In this process, not only the composition of the coating material, the performance of the coating material and the performance of the matrix itself, but also the laser process parameters have a significant impact on the quality of the cladding layer [34][35][36].…”

Section: Principle and Characteristics Of Laser Cladding Methodsmentioning

confidence: 99%

Technical Characteristics and Wear-Resistant Mechanism of Nano Coatings: A Review

et al. 2020

Coatings

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Nano-coating has been a hot issue in recent years. It has good volume effect and surface effect, and can effectively improve the mechanical properties, corrosion resistance and wear resistance of the coatings. It is important to improve the wear resistance of the material surface. The successful preparation of nano-coatings directly affects the application of nano-coatings. Firstly, the preparation methods of conventional surface coatings such as chemical vapor deposition and physical vapor deposition, as well as the newly developed surface coating preparation methods such as sol-gel method, laser cladding and thermal spraying are reviewed in detail. The preparation principle, advantages and disadvantages and the application of each preparation method in nano-coating are analyzed and summarized. Secondly, the types of nano-coating materials are summarized and analyzed by inorganic/inorganic nanomaterial coatings and organic/inorganic nanomaterial coatings, and their research progress is summarized. Finally, the wear-resistant mechanism of nano-coatings is revealed from three aspects: grain refinement, phase transformation toughening mechanism and nano-effects. The application prospects of nano-coatings and the development potential combined with 3D technology are prospected.

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Effect of laser reheat post-treatment on the microstructural characteristics of laser-cladded ultra-high strength steel

Cited by 40 publications

References 28 publications

Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

Microstructure and Electrochemical Corrosion Behaviors of Laser‐Cladded 2205 Duplex Stainless Steel

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Technical Characteristics and Wear-Resistant Mechanism of Nano Coatings: A Review

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