Comparison of impact-abrasive wear characteristics and performance of direct quenched (DQ) and direct quenched and partitioned (DQ&amp;P) steels

Haiko, Oskari; Somani, Mahesh C.; Porter, David; Kantanen, P.; Kömi, Jukka; Ojala, Niko; Heino, Vuokko

doi:10.1016/j.wear.2017.12.016

Cited by 37 publications

(19 citation statements)

References 29 publications

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“…Despite aggressive test conditions-high-speed and long-time-period tests-the volume loss of the coatings was relatively low, and there is only a small opportunity to compare the achieved results with other works because of a lack of test results for thermally sprayed coatings tested under dry-pot erosive test conditions. Some results can be found in the works of N. Ojala [35][36][37][38][39], but the authors often used slurry-pot erosive tests, for which the conditions were quite different. The low volume loss was the manifestation of good adhesion of the coatings to the substrate, and particularly between the particles and the matrix.…”

Section: Resultsmentioning

confidence: 99%

Microstructure, Wear Behavior and Corrosion Resistance of WC-FeCrAl and WC-WB-Co Coatings

Brezinová

Landová

Guzanová

et al. 2018

Metals

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The paper is focused on investigating the quality of two grades of thermally sprayed coatings deposited by high-velocity oxygen fuel (HVOF) technology. One grade contains WC hard particles in an environmentally progressive Ni-and Co-free FeCrAl matrix, while the second coating contains WC and WB hard particles in a cobalt matrix. The aim of the experimental work was to determine the effect of thermal cyclic loading on the coatings' resistance to adhesive, abrasive and erosive wear. Abrasive wear was evaluated using abrasive cloth of two grit sizes, and erosive wear was evaluated by a dry-pot wear test in a pin mill at two sample angles. Adhesion wear resistance of the coatings was determined by a sliding wear test under dry friction conditions and in a 1 mol water solution of NaCl. Corrosion resistance of the coatings was evaluated using potentiodynamic polarization tests. Metallographic cross-sections were used for measurement of the microhardness and thickness and for line energy-dispersive X-ray (EDX) analysis. The tests proved the excellent resistance of both coatings against adhesive, abrasive, and erosive wear, as well as the ability of the WC-WB-Co coating to withstand alternating temperatures of up to 600 • C. The "green carbide" coating (WC-FeCrAl) can be recommended as an environmentally friendly replacement for Ni-and Co-containing coatings, but its operating temperature is strictly limited to 500 • C in air.

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Section: Resultsmentioning

confidence: 99%

Microstructure, Wear Behavior and Corrosion Resistance of WC-FeCrAl and WC-WB-Co Coatings

Brezinová

Landová

Guzanová

et al. 2018

Metals

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“…Starting from the water quenched sample, the microstructure consisted of lath-like martensite comprising packets, blocks, and sub-blocks. The darkest auto-tempered martensite was the most dominant phase in the water quenched microstructure (Figure 3b), as is typical of other commercial medium carbon steels, such as some wear-resistant steels [19][20][21][22][23]. Autotempering is desirable for this type of steel in order to improve the impact toughness in the asquenched state.…”

Section: Microstructuresmentioning

confidence: 89%

The Effect of Tempering on the Microstructure and Mechanical Properties of a Novel 0.4C Press-Hardening Steel

et al. 2019

Self Cite

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In this paper, the effects of different tempering temperatures on a recently developed ultrahigh-strength steel with 0.4 wt.% carbon content were studied. The steel is designed to be used in press-hardening for different wear applications, which require high surface hardness (650 HV/58 HRC). Hot-rolled steel sheet from a hot strip mill was austenitized, water quenched and subjected to 2-h tempering at different temperatures ranging from 150 °C to 400 °C. Mechanical properties, microstructure, dislocation densities, and fracture surfaces of the steels were characterized. Tensile strength greater than 2200 MPa and hardness above 650 HV/58 HRC were measured for the as-quenched variant. Tempering decreased the tensile strength and hardness, but yield strength increased with low-temperature tempering (150 °C and 200 °C). Charpy-V impact toughness improved with low-temperature tempering, but tempered martensite embrittlement at 300 °C and 400 °C decreased the impact toughness at −40 °C. Dislocation densities as estimated using X-ray diffraction showed a linear decrease with increasing tempering temperature. Retained austenite was present in the water quenched and low-temperature tempered samples, but no retained austenite was found in samples subjected to tempering at 300 °C or higher. The substantial changes in the microstructure of the steels caused by the tempering are discussed.

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“…[6,[14][15][16] For a further improvement in the strength of these steels, a martensitic transformation is performed by instant quenching. [4,8,17] Therefore, alloying elements such as Mn, Cr, Mo, Si, and B come to application, which, in dissolved condition, decelerate the diffusion-controlled c to a transformation and enable full martensitic strength. [18] During cooling, Mo retards the pro-eutectoid ferrite and perlite transformation [19] and prevents the Nb-precipitation to Nb(CN).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the influences of the rolling conditions and FRTs on the mechanical properties of the martensitic steel product are largely scientifically explored. [8,16,17] Nevertheless, there is a lack of research, if the rolling conditions and especially the FRTs influence both M S and hardening characteristics. To investigate the effect of the FRT on the hardenability, a rolling scenario with two different FRTs was performed on a Deformation Dilatometer Ba¨hr 805 A/D.…”

Section: Introductionmentioning

confidence: 99%

Influences of Thermomechanical Treatment and Nb Micro-alloying on the Hardenability of Ultra-High Strength Steels

Esterl

Sonnleitner

Schnitzer

2019

Metall Mater Trans A

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For the construction of mobile crane booms, ultra-high strength steels produced via thermomechanical processing (TMP) have widely substituted steels fabricated through the conventional quenching and tempering (Q+T) route. A strong deformation of the austenite grain during hot rolling followed by direct quenching (DQ) offers benefits in terms of strength and toughness. To guarantee an optimal through-hardening, alloying elements retarding the c to a transformation are used. To explore the influence of the processing route on the critical cooling rate and the hardenability, hot deformation tests were performed on a deformation dilatometer. Different cooling rates were applied after deformation corresponding to two different rolling cycles with varying finish rolling temperatures (FRTs). The obtained hardness values were compared to those received through conventional quenching after austenitization. These investigations conducted on three steels with varying micro-alloying contents showed that Nb in combination with TMP raises strength significantly, and promotes a bainitic and ferritic transformation in solid solution. When applying low FRTs and in combination with other micro-alloying elements, NbC coarsens and reduces the effect of precipitation hardening.

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Comparison of impact-abrasive wear characteristics and performance of direct quenched (DQ) and direct quenched and partitioned (DQ&P) steels

Cited by 37 publications

References 29 publications

Microstructure, Wear Behavior and Corrosion Resistance of WC-FeCrAl and WC-WB-Co Coatings

Microstructure, Wear Behavior and Corrosion Resistance of WC-FeCrAl and WC-WB-Co Coatings

The Effect of Tempering on the Microstructure and Mechanical Properties of a Novel 0.4C Press-Hardening Steel

Influences of Thermomechanical Treatment and Nb Micro-alloying on the Hardenability of Ultra-High Strength Steels

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