Abstract
The environment-induced cracking (EIC) of as-annealed Ni3(Si,Ti) and Ni3(Si,Ti) with 2Mo has been researched as functions of applied stress, chloride ion concentration, test temperature, and pH. The investigation of EIC was carried out by applying a constant method in NaCl solutions. The EIC susceptibility of both intermetallic compounds increased with increasing test temperature and Cl− ion concentration and increased with decreasing pH. The fracture surface morphologies of Ni3(Si,Ti) was intergranular while Ni3(Si,Ti) with 2Mo was a mixture of intergranular and transgranular, and the relationship between log t f (time to failure) and log l ss (steady-state elongation rate) became the identical straight line irrespective of applied stress, chloride ion concentration, test temperature, and pH, which means that l ss becomes a relevant parameter for predicting t f. The EIC susceptibility of Ni3(Si,Ti) with 2Mo was lower than that of Ni3(Si,Ti), which showed the advantageous effect of Mo. From the results acquired, EIC of both the compounds was indicated to take place by hydrogen embrittlement (HE).
Highlights
The environment-induced cracking (EIC) of as-annealed Ni3(Si,Ti) and Ni3(Si,Ti) with 2Mo has been researched as functions of applied stress, chloride ion concentration, test temperature, and pH
The EIC behavior of as-annealed Ni3(Si,Ti) and Ni3(Si,Ti) with 2Mo in NaCl solutions was investigated as functions of applied stress, test temperature, Cl− ion concentration, and pH by applying the constant load method
The results obtained were concluded as follows: 1. From the applied stress dependence of the three parameters, it was divided into three regions: the stress-dominated, EIC (HE)-dominated, and corrosion-dominated regions, respectively
Summary
The environment-induced cracking (EIC) of as-annealed Ni3(Si,Ti) and Ni3(Si,Ti) with 2Mo has been researched as functions of applied stress, chloride ion concentration, test temperature, and pH. Ni3(Si,Ti) intermetallic compounds with L12 structure have special strength and ductility properties, that is, (1) an increase in flow strength with increasing temperature and (2) high ductility over a wide range of test temperature (Takasugi et al 1990; Takasugi and Yoshida 1991) Their strength level was extraordinarily high compared to those of other L12 ordered intermetallic compounds which have been developed as advanced high temperature materials (Kaneno et al 2008). Ni3(Si,Ti) intermetallic compounds have remarkable mechanical properties compared to those of conventional alloys such as nickelbased alloys and high-strength alloy steel and stainless steel This intermetallic compound showed an excellent oxidation resistance in air at ambient. The usefulness of investigating the environment-induced cracking of as-annealed Ni3(Si,Ti) and Ni3(Si,Ti) with 2Mo shows the effect of Mo
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