Relationship among fatigue life, inclusion size and hydrogen concentration for high-strength steel in the VHCF regime

Yang, Zhi; Li, S.X.; Li, Y.D.; Liu, Y.B.; Wang, Hui; Weng, Yuqing

doi:10.1016/j.msea.2009.10.056

Cited by 40 publications

(31 citation statements)

References 18 publications

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“…As pointed out by Murakami et al that hydrogen trapped by inclusion is a crucial factor that causes the VHCF failure of high‐strength steels, an expression was developed to predict the fatigue strength of high‐strength steels in the VHCF regime in our recent study, which reads

{σ_{w H 1}}^{*} = \frac{2.7 {(H V + 120)}^{15 true/ 16}}{{((), \sqrt{A_{i n c}})}^{3 / 16}},

where σ wH 1 * is the estimated fatigue strength considering the influence of hydrogen (MPa). The expression was supported by the fatigue test data of 18 kinds of high‐strength steel for over 400 specimens with different inclusion sizes and with tensile strength ranging from 1680 to 2180 MPa …”

Section: Discussionmentioning

confidence: 77%

“…13,14,20 The fatigue strength, fatigue life and the stress intensity factor range at the periphery of GBF (ΔK GBF ) were all decreased for hydrogen-charged highstrength steels with hydrogen content up to 10 ppm. [15][16][17][18][19][20] For example, increasing hydrogen content from 0.6 to 3.0 ppm decreased the fatigue strength at 2 × 10 9 cycles to nearly half of the value of uncharged condition. 20 Although different models concerning the effects of hydrogen on VHCF behaviour of high-strength steels were suggested, the fatigue behaviour and the mechanism of hydrogen influencing fatigue properties in the VHCF regime are still not well understood.…”

Section: Introductionmentioning

confidence: 99%

“…2 Therefore, the effects of hydrogen on VHCF behaviour have gained much attention. 2,[13][14][15][16][17][18][19][20] It was found that hydrogen trapped by inclusions plays a detrimental effects on the VHCF properties of highstrength steels. 13,14,20 The fatigue strength, fatigue life and the stress intensity factor range at the periphery of GBF (ΔK GBF ) were all decreased for hydrogen-charged highstrength steels with hydrogen content up to 10 ppm.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Very high cycle fatigue properties of high‐strength spring steel 60SiCrV7

Wang

Zhou

Zhang

et al. 2016

Fatigue Fract Eng Mat Struct

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The very high cycle fatigue properties of spring steel 60SiCrV7 for automotive suspension system with different hydrogen contents were studied by using ultrasonic fatigue testing and fatigue crack growth testing. The results show that the S–N curves exhibit continuous drop of fatigue lives and no obvious horizontal line exists. Similar fracture surface features were observed for all the specimens that failed mainly from internal inclusions with surrounding granular bright facet (GBF). Fatigue strength decreases remarkably with increasing hydrogen content. The applied stress intensity factor range at the periphery of GBF ΔKGBF is approximately proportional to 1/3 power of the square of GBF area. The average values of ΔKGBF for uncharged specimens are close to crack growth threshold ΔKth, which indicates that ΔKGBF could be regarded as the threshold value governing the beginning of stable fatigue crack propagation. The increase of hydrogen content tends to reduce ΔKGBF.

show abstract

{σ_{w H 1}}^{*} = \frac{2.7 {(H V + 120)}^{15 true/ 16}}{{((), \sqrt{A_{i n c}})}^{3 / 16}},

Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Very high cycle fatigue properties of high‐strength spring steel 60SiCrV7

Wang

Zhou

Zhang

et al. 2016

Fatigue Fract Eng Mat Struct

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“…The effects of microstructure, quantity and morphology of impurities and other parameters on fatigue strength have been extensively researched. Particular attention was paid to hard steels where non-metallic inclusions, mostly large defects observed on the surface, lower a material's strength under exposure to variable loads [32][33][34][35]. The effect of submicroscopic impurities on fatigue strength is much more difficult to analyze and is, therefore, less frequently investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect Of The Spacing Between Submicroscopic Oxide Impurities On The Fatigue Strength Of Structural Steel

Lipiński¹

2015

Archives of Metallurgy and Materials

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The article discusses the effect of distance between submicroscopic oxide impurities (up to 2 μm in size) on the fatigue resistance coefficient of structural steel during rotary bending. The study was performed on 21 heats produced in an industrial plant. Fourteen heats were produced in 140 ton electric furnaces, and 7 heats were performed in a 100 ton oxygen converter. All heats were desulfurized. Furthermore seven heats from electrical furnaces were refined with argon, and heats from the converter were subjected to vacuum circulation degassing.Steel sections with a diameter of 18 mm were hardened from austenitizing by 30 minutes in temperature 880°C and tempered at a temperature of 200, 300, 400, 500 and 600°C. The experimental variants were compared in view of the applied melting technology and heat treatment options. The results were presented graphically and mathematically. The fatigue resistance coefficient of structural steel with the effect of spacing between submicroscopic oxide impurities was determined during rotary bending. The results revealed that fatigue resistance coefficient k is determined by the distance between submicroscopic non-metallic inclusions and tempering temperature.Keywords: steel, structural steel, non-metallic inclusions, fatigue strength, oxide impurities, fatigue resistance coefficient, bending fatigue, bending pendulum W pracy przedstawiono wyniki badań wpływu odległości pomiędzy submikroskopowymi zanieczyszczeniami tlenkowymi, o wielkości do 2 μm, na wskaźnik odporności na zmęczenie stali konstrukcyjnej przy zginaniu obrotowym. Badania prowadzono na 21 wytopach wyprodukowanych w warunkach przemysłowych. 14 wytopów wykonano w piecach elektrycznych o pojemności 140 ton i 7 wytopów w konwertorze tlenowym o pojemności 100 ton. Wszystkie wytopy poddawano odsiarczaniu. Dodatkowo 7 wytopów pochodzących z pieca elektrycznego poddawano rafinacji argonem, zaś wytopy z konwertora odgazowaniu próżniowemu.Odcinki ze stali o średnicy 18 mm hartowano po austenityzowaniu w czasie 30 minut z temperatury 880°C i odpuszczano w temperaturach: 200, 300, 400, 500 lub 600°C. Warianty badań zestawiono uwzględniając technologię wytapiania stali opcje obróbki cieplnej. Wyniki przedstawiono w graficznej i matematycznej postaci uwzględniającej zależności wskaźnik odporności na zmęczenie przy obrotowym zginaniu z odległości pomiędzy submikroskopowymi zanieczyszczeniami. Wykazano, że wskaźnik odporności na zmęczenie k zależy od odległości pomiędzy submikroskopowymi wtrąceniami niemetalicznymi, oraz temperatury odpuszczania.

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“…Structural stresses are a function of inclusion structure. They are mostly affected by heat processing temperature when thermal stresses are formed along the inclusion-matrix (steel structure) boundary [3,[13][14][15][16][17]. The intensity and rate of micro-crack formation and stress levels that cause fatigue cracking are determined by the resistance encountered by migrating dislocations.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Production Process and Heat Processing Parameters on the Fatigue Strength of High-Grade Medium-Carbon Steel

Lipiński¹,

Wach²

2012

Archives of Foundry Engineering

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The experimental material consisted of semi-finished products of high-grade, medium-carbon constructional steel with: manganese, chromium, nickel, molybdenum and boron. The experimental material consisted of steel products obtained in three metallurgical processes: electric and desulfurized (E), electric and desulfurized with argon-refined (EA) and oxygen converter with vacuum degassed of steel (KP). The production process involved two melting technologies: in a 140-ton basic arc furnace with desulphurisation and argon refining variants, and in a 100-ton oxygen converter. Billet samples were collected to analyze: relative volume of impurities, microstructure and fatigue tests. The samples were quenched and austenitized at a temperature of 880 o C for 30 minutes. They were then cooled in water and tempered by holding the sections at a temperature of 200, 300, 400, 500 and 600 o C for 120 minutes and air-cooled. Fatigue tests were performed with the use of a rotary bending machine at a frequency of 6000 cpm. The results were statistical processed and presented in graphic form. This paper discusses the results of microstructural analyses, the distribution of the relative volume of impurities in different size ranges, the fatigue strength characteristics of different production processes, the average number of sampledamaging cycles and the average values of the fatigue strength coefficient for various heat processing options.

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Relationship among fatigue life, inclusion size and hydrogen concentration for high-strength steel in the VHCF regime

Cited by 40 publications

References 18 publications

Very high cycle fatigue properties of high‐strength spring steel 60SiCrV7

Very high cycle fatigue properties of high‐strength spring steel 60SiCrV7

Effect Of The Spacing Between Submicroscopic Oxide Impurities On The Fatigue Strength Of Structural Steel

The Effect of the Production Process and Heat Processing Parameters on the Fatigue Strength of High-Grade Medium-Carbon Steel

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