STRESS CORROSION CRACKING BEHAVIOR OF A NEW KIND OF ULTRAHIGH STRENGTH STEEL Cr12Ni4Mo2Co14 IN ACID ENVIRONMENT

doi:10.11900/0412.1961.2016.00040

Acta Metall Sin

2016, Vol. 52

Issue (11): 1372-1378 DOI: 10.11900/0412.1961.2016.00040

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STRESS CORROSION CRACKING BEHAVIOR OF A NEW KIND OF ULTRAHIGH STRENGTH STEEL Cr12Ni4Mo2Co14 IN ACID ENVIRONMENT

Min SUN¹(

),Xiaogang LI²,Jin LI³

1 Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China;
2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 3 Department of Materials Science, Fudan University, Shanghai 200433, China ;

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Min SUN,Xiaogang LI,Jin LI. STRESS CORROSION CRACKING BEHAVIOR OF A NEW KIND OF ULTRAHIGH STRENGTH STEEL Cr12Ni4Mo2Co14 IN ACID ENVIRONMENT. Acta Metall Sin, 2016, 52(11): 1372-1378.

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Abstract

In recent years, the development of aerospace industry puts forward a higher requirement for the high strength, high toughness and good weldability of steel materials. Cr12Ni4Mo2Co14 steel is a new kind of ultrahigh strength steel, which is usually used as structure materials under complex stress/strain conditions. In this work, the stress corrosion cracking behavior of Cr12Ni4Mo2Co14 steel in acid environment was studied by slow-strain rate test (SSRT) and SEM. The results showed that the stress corrosion cracking (SCC) susceptibility of Cr12Ni4Mo2Co14 steel was enhanced by chlorine ions remarkably. The critical value of chlorine ion concentration was about 0.15%, above which, severe SCC occurred induced by chlorine ions, and the SCC cracks started from pits. The SCC mechanism of Cr12Ni4Mo2Co14 steel in acid solution containing chlorine ions can be clarified by “slide-film breaking” model. The hydrogen-charged samples of Cr12Ni4Mo2Co14 steel were sensitive to hydrogen induced cracking, and second cracks occurred on the fracture surface. The critical value of hydrogen-charged current density is 10 mA/cm² for 30 min in solutions with pH=5, above which, the losses of strength and plasticity of Cr12Ni4Mo2Co14 steel reached to the maximum. The effects of chlorine ions and hydrogen had a complex interaction which cannot be added up directly.

Key words: ultrahigh strength steel, acid environment, stress corrosion cracking(SCC), H, Cl-

Received: 26 January 2016

Fund: Supported by National Natural Science Foundation of China (No.51501041)

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	Min SUN
	Xiaogang LI
	Jin LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00040 OR https://www.ams.org.cn/EN/Y2016/V52/I11/1372

Fig.1 Stress-strain curves of Cr12Ni4Mo2Co14 steel in H₂SO₄+Na₂SO₄ solutions with different concentrations of Cl^- [Cl^-]

Fig.2 Fracture SEM images of Cr12Ni4Mo2Co14 steel in H₂SO₄+Na₂SO₄ solutions with [Cl^-] of 0.15% (a) and 0.35% (b)

Fig.3 Stress-strain curves of Cr12Ni4Mo2Co14 steel in H₂SO₄+Na₂SO₄ solutions with different hydrogen-charged current densities i_H

Fig.4 Fracture SEM images of Cr12Ni4Mo2Co14 steel with 0 mA/cm² (a), 10 mA/cm² (b) and 25 mA/cm² (c) i_H for 30 min (Inset in Fig.4b indicates secondary crack)

Fig.5 Effect of Cl^- and H on stress-strain curves (a) and fracture morphology for i_H=10 mA/cm² and [Cl^-]=0.15% (b) of Cr12Ni4Mo2Co14 steel in H₂SO₄+Na₂SO₄ solutions

Fig.6 Effect of [Cl^-] on loss of strength Δσ[Cl-], elongation Δδ[Cl-], reduction-in-area Δψ[Cl-] and crack time t_crack of Cr12Ni4Mo2Co14 steel

Fig.7 Schematics of crack propagation process of Cr12Ni4Mo2Co14 steel in acid solutions with Cl^-(a) passive film formed on the Cr12Ni4Mo2Co14 steel(b) passive film broken at the slip steps, under the tensile stress(c) the matrix steel at the broken passive film continued to dissolve (d) dissolution of the crack tip at a lower potential promoted the crack propagation process

Fig.8 Effect of i_H on loss of strength Δσ[H], elongation Δδ[H], reduction-in-area Δψ[H]and crack time of Cr12Ni4Mo2Co14 steel

Fig.9 Effects of Cl^- and H on the loss of strength Δσ[Cl-*H] for Cr12Ni4Mo2Co14 steel

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