Effect of Aluminum on Microstructure and Mechanical Properties of Weld Metal of Q960 Steel

Zou, Zongxuan; Zhengjun, Liu; Ai, Xingyu; Wu, Dan

doi:10.3390/cryst12010026

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…With the addition of Mg, the content of AF increased, while the formation of FSP was restrained due to the competitive growth relation between AF and FSP. [ 37,38 ] The formation of AF increased with the increase of Mg content from 0 to 0.003%, and the AF microstructure presents obvious interlocked shape. When Mg content was 0.0053%, there was more bainite formation.…”

Section: Resultsmentioning

confidence: 99%

Evolution of Inclusions and Microstructure in Ca‐La‐Treated C‐Mn Steel with Different Mg Contents

Wang

Song

Mao

et al. 2022

steel research int.

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Herein, the effect of Mg content on inclusions and microstructure of Ca‐La‐treated steel is investigated. Inclusions mainly consist of oxide cores, La‐containing parts, and sulfides in the final quenched samples. Oxide cores are Ca‐Al‐O in Mg‐free sample, whereas those in Mg‐bearing samples change from Mg‐Ca‐Al‐O and Mg‐Al‐O to MgO with the increasing Mg content. Increasing Mg content from 0 to 0.003%, the number density of inclusions increases while mean size decreases due to the formation of fine Mg‐containing inclusions. When Mg content is 0.0053%, the formation of sulfides (MgS and CaS) with high contact angle promotes the aggregation of inclusions, which results in the decrease of number density of inclusions and the increase of inclusions size. Effective inclusions are predominantly composed of oxide cores and MnS shells. A large amount of acicular ferrite (AF) is obtained in low and medium Mg content samples due to the formation of a mass of effective inclusions. High Mg content leads to the formation of MgS and CaS and suppresses the precipitation of MnS, which decreases the effectiveness of inclusions to induce the formation of AF.

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Section: Resultsmentioning

confidence: 99%

Evolution of Inclusions and Microstructure in Ca‐La‐Treated C‐Mn Steel with Different Mg Contents

Wang

Song

Mao

et al. 2022

steel research int.

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“…The pivotal factors for achieving outstanding strength and toughness in deposited metal for low-alloy high-strength steel involve appropriate composition design and optimization of welding parameters. [9,10] Once the welding material's composition is established, the performance of the deposited metal is primarily governed by the welding process. Heat input is critical in welding operations as it directly affects the weld, heat-affected zone (HAZ), and grain size.…”

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confidence: 99%

Effect of Heat Input on the Metal Microstructure and Mechanical Properties of Q960 High‐Strength Steel Solid Core Welding Wire

Zhu,

Min,

Xiao

et al. 2024

steel research int.

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The self‐developed Q960 high‐strength steel solid wire with different heat input is welded by MIG welding to solve the problem of insufficient low‐temperature toughness of Q960 steel weld. The effect of heat input on the microstructure and mechanical properties of butt welding deposited metal is studied in depth. The results show that the microstructure of deposited metal is composed of granular bainite (GB), degenerate upper bainite (DUB), martensite (M), and acicular ferrite (AF). DUB and M play key roles as strengthening phases, whereas GB and AF serve as primary toughening phases. Elevated heat input leads to a progressively rougher microstructure in the deposited metal. AF and DUB increase first and then decrease, GB increases and M decreases slightly. The inclusions conducive to AF nucleation are mainly composed of oxides of Mn, Si, Ti, and Mn sulfide with sizes between 100 and 500 nm. At a 14 kJ cm−1 heat input, the complex phase microstructure effectively refines the grain, and the high‐angle grain boundaries and ferrite interlocking structure optimize the strength and toughness balance of the deposited metals. The tensile strength measures 958 MPa, with the highest elongation at 19% and an average impact toughness of 50 J at −40 °C.

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Influence of Aluminum on the Retained Austenite Content and Stresses in the Surface Layer of Steel after a Hybrid Low‐Pressure Carburizing Process with Metallization

Kowalczyk,

Dybowski,

Januszewicz

et al. 2024

Adv Eng Mater

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The article presents a unique method of modifying the surface layer properties of low‐alloy steels. This method consists of the simultaneous saturation of the surface layer with aluminum and carbon. A hybrid heat treatment process is used, which integrates diffusion metallization with low‐pressure carburizing (LPC). An aluminum coating is applied to the surface of the steel by physical vapour deposition or slurry method to saturate the surface layer with aluminum. The steel is then annealed to create a diffusion layer and subjected to LPC. Gas quenching in nitrogen and low‐temperature tempering are performed after carburization. This surface treatment tenfold reduces the amount of retained austenite in the carburized layer. This is particularly critical for carburized steels that include austenite‐stabilizing elements, such as nickel and manganese. This causes an increase in surface hardness. It also changes the state of residual stress compared to ordinary LPC to one that is more favorable from the point of view of operation—compressive stresses are generated in the technological surface layer.

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Effect of Aluminum on Microstructure and Mechanical Properties of Weld Metal of Q960 Steel

Cited by 6 publications

References 22 publications

Evolution of Inclusions and Microstructure in Ca‐La‐Treated C‐Mn Steel with Different Mg Contents

Evolution of Inclusions and Microstructure in Ca‐La‐Treated C‐Mn Steel with Different Mg Contents

Effect of Heat Input on the Metal Microstructure and Mechanical Properties of Q960 High‐Strength Steel Solid Core Welding Wire

Influence of Aluminum on the Retained Austenite Content and Stresses in the Surface Layer of Steel after a Hybrid Low‐Pressure Carburizing Process with Metallization

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