Why do steels with high carbon content break easily?

Ford
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BMW
2006-2009 New Auto Bmw Mini Cooper Clubman Convertible 1.6L Timing Kit/kit de distribución/spannrollen kit Mini cooper clubman R55 R56 1.6L 2.0L Timing Kit/kit de distribución/spannrollen kit Timing chain kit fit bmw 3 series bmw 5 series z3 e46 e34 e36 for sale/kit de distribución/kit de distribution BMW Timing Chain Kit/kit de distribución/kit de distribution Cooper Timing chain kit/kit de distribución/kit de distribution BMW E30 Timing chain kit/kit de distribución/spannrollen kit BMW 1 Timing chain kit/kit de distribución/spannrollen kit BMW 3 Series Timing chain kit/kit de distribución/kit de distribution BMW Z4 Timing chain kit/kit de distribución/kit de distribution Mini Clubman Timing chain kit/kit de distribución/spannrollen kit
Benz
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Opel
Astra Timing Chain Kit Opel Astra G Timing Chain Kit Vauxhall Astra Timing Chain Kit Vauxhall Vivaro Timing Chain Kit Vauxhall Zafira Timing Chain Kit Opel Corsa A14NET Timing Chain Kit Opel K12B Timing Chain Kit Opel Zafira Timing Chain Kit Vauxhall Signum Timing Chain Kit Opel Omega B Timing Chain Kit Opel Zafira Timing Chain Kit
Honda
Honda S2000 Timing Chain Kit Honda Timing Chain Kit Honda Civic Timing Chain Kit Honda Civic Hybrid Timing Chain Kit Honda Fit & Fit Sport Timing Chain Kit Honda City Timing Chain Kit Accord Timing Chain Kit Honda Cars Timing Chain Kit Honda Accord Timing Chain Kit S2000 2Dr Base 2.0L Ka6Mt Timing Chain Kit Honda S2000 2.0L F20C1/C2 Timing Chain Kit
Mitusibishi
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Nissan
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Toyota
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Suzuki
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Mazda
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Daihastu
Terios Timing chain kit Daihatsu Timing chain kit
Isuzu
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Hyundai
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Iveco
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Jeep
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Kia
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Chevrolet
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Citroen
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Audi
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Peugeot
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Renault
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Chrysler
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Volkswagen
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Dodge
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Fiat
Strada Timing Chain Kit Ducato Timing Chain Kit Palio Timing Chain Kit 500 Fiat Timing Chain Kit Fiat Croma Timing Chain Kit Croma Timing Chain Kit Ducato Timing Chain Kit
Acura
K24A2 Honda Parts Acura Tsx Element Timing Chain Kit 2002-2006 KA20A Honda Acura RSX Type S Timing Chain Kit for Sale 2009-2010 KA5AT KA6MT Honda Accord Timing Chain Kit
Alfa romeo
Alfa Romeo 2198CC Brera 2.2JTS 2006.1 Timing chain kit Alfa Romeo Spider (939)2.2JTS 2006.9 Balance kit Alfa Romeo Mito Timing chain kit
American motors
American Motors 2.5-U(150) 4 Cyl. 1983-1987 Timing chain kit American Motors 2.8(173) V6 1985-86 Timing chain kit
Cadillac
Cimarron Timing Chain Kit Cimarron 2.8-W(173) V6 85-88 Timing Chain Kit Cadillac Timing Chain Kit Eldorado Timing Chain Kit
Cam Phaser VVT
VVT gear for European vehicle VVT gear for American vehicle VVT gear for Asian vehicle 03C109088B 03C109088E 03C109088F VVT gear Cam phaser for Volkswagen EA111
Daimler
Daimler Jaguar Timing Chain Kit
General motors
Gm Timing Chain Kit
Hummer
Hummer Timing Chain Kit Canyon 2007-10 Timing Chain Kit Hummer H3 Timing Chain Kit Hummer 6.0L 366Ci Lq4 V8 2003-07 Timing Chain Kit
Infiniti
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Buick
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Jaguar
Jaguar Timing Chain Kit Jaguar Cars Timing Chain Kit
LTI
LTI Timing Chain Kit
Lincoln
Lincoln Timing Chain Kit Lincoln Cars Timing Chain Kit Lincoln Mkz Timing Chain Kit Milan Timing Chain Kit Contour Timing Chain Kit Auto Lincoln Timing Chain Kit Zephyr Timing Chain Kit
LDV
Ldv Timing Chain Kit
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Lotus Timing Chain Kit
Lexus
Lexus 3Gr-Fe Timing Chain Kit Toyota Land Cruiser For Sale Timing Chain Kit GS350 Timing Chain Kit Lexus Cars Timing Chain Kit Lexus 570 Timing Chain Kit
Lancia
Lancia Timing Chain Kit
Roewe
Roewe 350 1.5L Timing Chain Kit
Saab
Saab Timing Chain Kit Saab 93 Timing Chain Kit Saab 9000 Timing Chain Kit
Saturn
Saturn Timing Chain Kit Saturn Sci Timing Chain Kit Saturn Sc2 Timing Chain Kit Saturn 1.9L L4 Sl1 Timing Chain Kit

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Why do steels with high carbon content break easily? Part 1

2022-06-24

Bars with high carbon content have broken many times, such as shafts made of 45# steel, which will break after a short time of use. Taking samples from the fractured parts and conducting metallographic analysis, it is often impossible to find the cause, even if it is far-fetched to find some reasons, it is not the actual reason.

To ensure higher strength, carbon must also be added to the steel, with which iron carbides precipitate. From an electrochemical point of view, iron carbide acts as a cathode, accelerating the anodic dissolution reaction around the substrate. The increase in the volume fraction of iron carbides within the microstructure is also attributed to the low hydrogen overvoltage properties of the carbides.

The surface of the steel is easy to generate and absorb hydrogen. When the hydrogen atoms infiltrate into the steel, the volume fraction of hydrogen may increase, and finally the resistance to hydrogen embrittlement of the material is significantly reduced.

The significant reduction in corrosion resistance and hydrogen embrittlement resistance of high-strength steels not only harms the properties of the steel, but also greatly limits the application of the steel.

For example, when automobile steel is exposed to various corrosive environments such as chloride, under the action of stress, the phenomenon of stress corrosion cracking (SCC) that may occur will pose a serious threat to the safety of the car body.

The higher the carbon content, the lower the hydrogen diffusion coefficient and the higher the hydrogen solubility. Scholar Chan once proposed that various lattice defects such as precipitates (as trap sites for hydrogen atoms), potential, and pores are proportional to the carbon content. The increase of carbon content will inhibit hydrogen diffusion, so the hydrogen diffusion coefficient is also low.

Since the carbon content is proportional to the hydrogen solubility, the greater the volume fraction of carbides as hydrogen atom traps, the smaller the hydrogen diffusion coefficient inside the steel, the greater the hydrogen solubility, and the hydrogen solubility also contains information about diffusible hydrogen, so Hydrogen embrittlement susceptibility is the highest. With the increase of carbon content, the diffusion coefficient of hydrogen atoms decreases and the surface hydrogen concentration increases, which is caused by the decrease of hydrogen overvoltage on the steel surface.

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