Martensitic Structural Steels for Increased Strength and Wear Resistance

Ahlblom, Bertil; Hansson, Per; Narström, Torbjörn

doi:10.4028/www.scientific.net/msf.539-543.4515

Cited by 14 publications

(8 citation statements)

References 1 publication

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“…To achieve the climate goals and the associated reductions in CO 2 emissions, modern steel constructions require the use of high-strength structural steels with yield strengths of 690 MPa and more. High-strength structural steel grades have been used for several decades, particularly in mobile crane construction [1,2]. The field of application is currently being extended to wind turbine and bridge construction.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-assisted cracking in GMA welding of high-strength structural steels using the modified spray arc process

et al. 2020

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High-strength structural steels are used in machine, steel, and crane construction with yield strength up to 960 MPa. However, welding of these steels requires profound knowledge of three factors in terms of avoidance of hydrogen-assisted cracking (HAC): the interaction of microstructure, local stress/strain, and local hydrogen concentration. In addition to the three main factors, the used arc process is also important for the performance of the welded joint. In the past, the conventional transitional arc process (Conv. A) was mainly used for welding of high-strength steel grades. In the past decade, the so-called modified spray arc process (Mod. SA) has been increasingly used for welding production. This modified process enables reduced seam opening angles with increased deposition rates compared with the Conv. A. Economic benefits of using this arc type are a reduction of necessary weld beads and required filler material. In the present study, the susceptibility to HAC in the heat-affected zone (HAZ) of the high-strength structural steel S960QL was investigated with the externally loaded implant test. For that purpose, both Conv. A and Mod. SA were used with same heat input at different deposition rates. Both conducted test series showed same embrittlement index “EI” of 0.21 at diffusible hydrogen concentrations of 1.3 to 1.6 ml/100 g of arc weld metal. The fracture occurred in the HAZ or in the weld metal (WM). However, the test series with Mod. SA showed a significant extension of the time to failure of several hours compared with tests carried out with Conv. A.

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Section: Introductionmentioning

confidence: 99%

Hydrogen-assisted cracking in GMA welding of high-strength structural steels using the modified spray arc process

et al. 2020

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“…However, few studies 5) have reported on the improvement in resistance to hydrogen embrittlement of low carbon steels for welded structures even though their tensile strength exceeds 1 200 MPa nowadays. 5,6) In the present study, the effects of uniform distribution of fine cementite on toughness and hydrogen embrittlement resistance were studied using directly-quenched and tempered 1 000-1 300 MPa class low carbon steel plates for welded structures with full lath martensite structure. Cementite was refined by a combination of modified ausforming and rapid heating to the tempering temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Uniform Distribution of Fine Cementite on Hydrogen Embrittlement of Low Carbon Martensitic Steel Plates

Nagao

Hayashi²,

Oi³

et al. 2012

ISIJ International

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The effect of uniform distribution of fine cementite on resistance of ultra-high strength steels to hydrogen embrittlement was studied. The materials used were directly-quenched and tempered 1 000-1 300 MPa class low carbon steel plates for welded structures with lath martensite structure. Cementite morphology was different at different heating rates to tempering temperatures. Finer cementite was distributed in rapidly-heated steels (20°C/s) than in slowly-heated steels (0.3°C/s). The rapidly-heated steels showed higher resistance to hydrogen embrittlement than the slowly-heated steels for a slow strain rate test (SSRT), whereas they showed almost the same resistance to hydrogen embrittlement for a constant load test (CLT). The specimens fractured in a plastic region for the SSRT, on the other hand, the CLT was conducted in an elastic region. The difference in hydrogen embrittlement resistance between plastic and elastic loading methods was concluded to result from a change in the hydrogen trap state at cementite in association with plasticity. Hydrogen is more strongly trapped at and/or around the strained interfaces between the matrix and cementite after plastic deformation. A close observation of fracture surfaces, hydrogen thermal desorption analysis and hydrogen microprint technique revealed that the high resistance of the rapidly-heated and tempered steels to hydrogen embrittlement for the SSRT is due to a shift of the fracture mode from quasicleavage fracture to ductile fracture. This shift was caused by the suppression of the quasi-cleavage fracture due to less hydrogen at lath boundaries accompanied by the uniform distribution of fine cementite.

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“…Correspondingly, the steel should have high hardness which is achieved by raising the carbon content. Toughness is not only needed due to likely high-impact loading under service conditions, but also to further improve wear resistance [41,42]. Molybdenum alloying, often in combination with niobium, provides the required property spectrum of strength, hardness and toughness.…”

Section: Application Examples Of Martensitic Steelsmentioning

confidence: 99%

Molybdenum alloying in high-performance flat-rolled steel grades

et al. 2020

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Considerable progress in developing flat-rolled steel grades has been made by the Chinese steel industry over the recent two decades. The increasing demand for high-performance products to be used in infrastructural projects as well as in production of consumer and capital goods has been driving this development until today. The installation of state-of-the-art steel making and rolling facilities has provided the possibility of processing the most advanced steel grades. The production of high-performance steel grades relies on specific alloying elements of which molybdenum is one of the most powerful. China is nearly self-sufficient in molybdenum supplies. This paper highlights the potential and advantages of molybdenum alloying over the entire range of flat-rolled steel products. Specific aspects of steel property improvement with respect to particular applications are indicated.

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Martensitic Structural Steels for Increased Strength and Wear Resistance

Cited by 14 publications

References 1 publication

Hydrogen-assisted cracking in GMA welding of high-strength structural steels using the modified spray arc process

Hydrogen-assisted cracking in GMA welding of high-strength structural steels using the modified spray arc process

Effect of Uniform Distribution of Fine Cementite on Hydrogen Embrittlement of Low Carbon Martensitic Steel Plates

Molybdenum alloying in high-performance flat-rolled steel grades

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