Effect of Molybdenum on the Impact Toughness of Heat-Affected Zone in High-Strength Low-Alloy Steel

Wu, Xiaoyan; Ping, Xiao; Wu, Sung‐Mao; Yan, Chunliang; Ma, Xiaoqing; Liu, Zengxun; Chen, Wei; Zhu, Lingkai; Zhang, Qingjun

doi:10.3390/ma14061430

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…The samples used for microscopic observation are corroded with 4% nitric acid alcohol. The carbon replica is used to prepare the film, [ 18 ] and the copper mesh is fished and dried for transmission electron microscope observation.…”

Section: Methodsmentioning

confidence: 99%

The Influence Mechanism of HSLA Weld Metal with Different Composition on High‐Temperature Strength

et al. 2022

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In order to study the influence mechanism of HSLA weld metal with different composition on high‐temperature strength, four kinds of HSLA weld metal are designed by using low‐carbon Si–Mn and Si–Mn–Ni alloy system. Different samples are prepared by simple process of normalizing and high‐temperature tempering. The experimental results show that the weld metal is mainly composed of polygonal ferrite, quasipolygonal ferrite, pearlite, and granular bainite. Ni can change the microstructure shape of reheating zone and inhibit the formation of granular bainite. When the tempering temperature is lower than 580 °C, the strength increases. After tempering at 580 °C, the tensile strength and yield strength reach the peak value. When the tempering temperature exceeds 580 °C, the strength begins to decrease. The microhardness of the two alloy systems decreases gradually from columnar crystal zone to recrystallization zone. The impact absorption energy of the four samples is greater than 200 J at 600 °C. Under different temperature conditions, the content of Ni in all second‐phase particles is less than 10%, the content of Mn is lower, and the content of Si is higher.

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Section: Methodsmentioning

confidence: 99%

The Influence Mechanism of HSLA Weld Metal with Different Composition on High‐Temperature Strength

et al. 2022

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“…It can improve the hardenability of intercritical heat affected zone (ICHAZ), which can deteriorate the impact toughness, although it has been also shown that Mo can improve the HAZ toughness [8]. Wu et al [9] showed that Mo addition can increase the number density of precipitates and also diminished the size of these precipitates, which promoted the refinement of the grain size and the enhancement of the steel toughness in Nb-Mo steel.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Simulated Heat Affected Zone of Molybdenum- and Niobium Alloyed Ultra-High-Strength Steels

Hannula,

Kaijalainen,

Kömi

2023

KEM

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Gleeble 3800-thermomechanical simulator was used to simulate the heat affected zone of quenched and tempered 0.16 wt.% C steels with variation of molybdenum-and niobium contents. The purpose of the study was to evaluate the effect of alloying content on the properties of the coarse-grained zone of HAZ region (CGHAZ) and partially re-austenitised inter-critical zone (ICHAZ) with two different t8/5 times (5 s and 15 s). Results showed that Mo and Nb decreased the amount of softening in the HAZ-region, especially with longer t8/5 -time (15 s). 0Mo steel had mixed microstructure of bainite and martensite in the CGHAZ region with t8/5 time of 15 s, which led to higher degree of softening compared to other steels. Shorter t8/5 time of 5 s produced martensitic microstructure in CGHAZ region in all cases leading to higher hardness values. Impact energy values at-40 °C were at least 34 J/cm2 in all cases. Highest hardness values in the ICHAZ-region were achieved in the case of 0.5Mo steel. Also, at-40 °C impact energy values of ICHAZ were at least 34 J/cm2 in all cases, however Mo-free steel achieved clearly higher impact energies in ICHAZ region, which is result from softer microstructure with relatively low hardness compared to other steels. Overall, it can be concluded that longer t8/5 time can be used, which corresponds to higher heat input in welding, if Mo and/or Nb alloying is used.

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Removal of Molybdate Ions in Water on a Newly Synthesized Imidazolium‐based Poly (ionic liquid)

Zhao,

Zhang,

et al. 2023

ChemistrySelect

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The natural biological water system has been seriously damaged due to the discharge of wastewater containing too much molybdenum, endangering the life and health of animals and plants. Imidazolium‐based poly (ionic liquid) was synthesized by grafting copolymers of styrene and 1‐(chloromethyl)‐4‐vinylbenzene into N‐methylimidazole, N‐ethylimidazole and N‐propyl imidazole, followed by characterization with the use of nuclear magnetic resonance spectrometer and Fourier transform infrared spectrometer. How the Imidazolium‐based poly (ionic liquid) could recover MoO42− from sewage was investigated. The pH, reaction temperature, reaction duration, adsorbent dose, and interfering ions were all tuned for MoO42− adsorption conditions. Nitric acid can regenerate the Imidazolium‐based poly (ionic liquid) loaded with MoO42−. Both the adsorption kinetics and the adsorption isotherm exhibit good agreement with the quasi second‐order kinetic model and the Langmuir isotherm model, respectively.Imidazolium‐based poly (ionic liquid) have a special reusability when compared to polyaniline‐modified bentonite, iron‐based nanomaterials, and γ‐Fe2O3 nanomaterials. The results reveal that Imidazolium‐based poly (ionic liquid) has a strong recovery effect on trace molybdenum from wastewater, which makes it an effective adsorbent with industrial application value.

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Effect of Molybdenum on the Impact Toughness of Heat-Affected Zone in High-Strength Low-Alloy Steel

Cited by 6 publications

References 33 publications

The Influence Mechanism of HSLA Weld Metal with Different Composition on High‐Temperature Strength

The Influence Mechanism of HSLA Weld Metal with Different Composition on High‐Temperature Strength

Evaluation of Simulated Heat Affected Zone of Molybdenum- and Niobium Alloyed Ultra-High-Strength Steels

Removal of Molybdate Ions in Water on a Newly Synthesized Imidazolium‐based Poly (ionic liquid)

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