GILL AC basic electrochemical testing was used for general

GILL AC basic electrochemical testing was used for general corrosion test. Standard flat cells with an exposure area of 1 cm2 was used for experiments in aerated 3.5% NaCl solution with a scan rate of 0.166 mVs−1. Corrosion potential (Ecorr) values and corrosion rates were recorded. A Constant load type SCC test rig was used for SCC testing of both histone demethylase inhibitor metal and welds. Standard tensile and SCC specimens (Fig. 2) were machined out from the 5.2 mm rolled plate of the maraging steel and its welds as per ASTM E8 standards. 3.5% NaCl solution was used for alternate cycles of immersion of specimen. A Constant load of 50 percent yield strength value of specimen for a given condition was applied. The Yield strength values are determined from tensile test data given in Table 3. The time taken for failure of the specimen at a constant load was used to compare the different conditions of steel. The longer the time to failure is, higher will be the SCC resistance.
Results and discussion
Conclusions
Acknowledgements The authors would like to thank Dr. Amol Ghokale, Director, Defence Metallurgical Research Laboratory, Hyderabad for his continued encouragement and permission to publish this work. Financial assistance from Defence Research Development Organization (DRDO) is gratefully acknowledged.
Introduction A promising direction in arms development is an application of “reactive materials” instead of inert ones in its design. One of the first works in this direction was the experiments carried out in Ural Federal University during 1984 and 1988 [1,2]. In the USA, the first works on reactive materials were published in the late 1990s and the early 2000s. Beside USA, UK and China are also involved in research and testing of new principles of damage increase for kinetic, shaped charge and fragmentation projectiles, including the reactive materials in their design. Application of reactive materials could allow to solve a wide range of tasks in the future – from increasing the damage and effectiveness of the projectiles to enhancing their safety and reliability. One of the components of modern mixture reactive materials is fluoropolymer (TFE). Fluoropolymer has the ability to develop chemical reactions with energy released under certain conditions, not only under static loads and heating [1–3], but also under high-speed deformation together with targets containing aluminum [4–6]. The goal of the investigation is to determine the behavior of fluoropolymer under the condition of dynamic high-speed loading during its interaction with titanium alloy, and also to determine the behavior of target material.
Experimental results Projectiles with d0 = 0.013 m and elongation λ = L0/d0 = 2.4, where L0is projectile length, were used in the experiments. The experimental results are presented in Tables 1 and 2. After the experiments, the cavity parameters in targets were measured (Fig. 1). The depth h≿av, diameter d≿av, and volume W≿av of cavity were determined. The cavity in the semi-infinite target is formed by the kinetic energy of the projectile and partially by the energy released from thermochemical reaction of fluoropolymer with aluminum-based target. The energy balance equation can be written aswhere Е0 is kinetic energy of the projectile; Еch is energy released during chemical reaction and spent on cavity formation; Еep is energy spent on elastic and plastic deformation of the projectile; and Еcav is energy spent on cavity formation. The amount of energy spent on cavity formation for undeformable projectile can be determined by the amount of specific displacement work Аsp of target material.where h, hf are current and final penetration depth, respectively; F, Е0 are target resistance force and kinetic energy of the impact, respectively; Wcav is cavity volume. Fig. 2 shows the results for the experimental determination of the specific displacement work Аsp for fluoropolymer, textolite and steel projectiles. The analysis of the results shows that the specific displacement work necessary for the formation of the cavity with same volume in the fluoropolymer strikers is less than that in the steel strikers.