Comparative Evaluations on Stress Corrosion Cracking Mechanism of Low Alloy Ultra-High Strength Steels in Neutral 3.5 wt% NaCl Solution

Qiang GUO; Jian-hua LIU; Mei YU; Song-mei LI

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Comparative Evaluations on Stress Corrosion Cracking Mechanism of Low Alloy Ultra-High Strength Steels in Neutral 3.5 wt% NaCl Solution

机译：低合金超高强度钢在中性3.5 wt％NaCl溶液中应力腐蚀开裂机理的比较评估

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The stress corrosion cracking (SCC) mechanism of low alloy ultra-high strength steels 30CrMnSiNi2Aand 40CrNi2Si2MoVA in neutral 3.5wt% NaCl solution is investigated by slow strain rate technique(SSRT), surface analysis technique and electrochemical measurements. At anodic polarization,30CrMnSiNi2A shows excellent SCC resistance; on the contrary, 40CrNi2Si2MoVA displays muchhigher SCC susceptibility than 30CrMnSiNi2A. At cathodic polarization potential, the steels are bothsusceptible to hydrogen induced cracking (HIC). At OCP, SCC mechanism of 30CrMnSiNi2A ismainly under control of HIC; whereas, SCC process of 40CrNi2Si2MoVA at OCP is controlled by amixed mode of HIC and anodic dissolution.

机译：通过慢应变速率技术（SSRT），表面分析技术和电化学测量，研究了中性3.5wt％NaCl溶液中低合金超高强度钢30CrMnSiNi2A和40CrNi2Si2MoVA的应力腐蚀开裂机理。在阳极极化条件下，30CrMnSiNi2A表现出优异的抗SCC性。相反，40CrNi2Si2MoVA的SCC敏感性比30CrMnSiNi2A高。在阴极极化电势下，钢都易受氢致裂纹（HIC）的影响。在OCP下，30CrMnSiNi2A的SCC机理主要受HIC控制。 OCP下40CrNi2Si2MoVA的SCC过程受HIC和阳极溶解的混合模式控制。

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《International Journal of Electrochemical Science》 |2015年第1期|共12页
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Qiang GUO; Jian-hua LIU; Mei YU; Song-mei LI;
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Comparative Evaluations on Stress Corrosion Cracking Mechanism of Low Alloy Ultra-High Strength Steels in Neutral 3.5 wt% NaCl Solution

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