The mechanical improvement and "self-protection" properties are mainly needed to develop weather-resistant steel materials. In this study, A588 was given thermomechanical treatment (hot-rolling) followed by a quench-tempering process. is modified adding 1, 2, 3 wt% nickel the primary alloy. Steel made using hot rolling process at 750 ℃ for 1 hour with 70% thickness reduction. sample heat-treate...

the current study assesses the root causes of hydrogen blisters on low strength carbon steel equipment. for this purpose, some experiments including hardness test, non-destructive test (ndt), metallography, and fractograpghy are conducted. the microstructure of two blisters is assessed by means of optical microscopy and scanning electron microscopy (sem). the microstructural studies show that t...

This research studied the application of the response surface methodology (RSM) and central composite design (CCD) experiment in mathematical model and optimizes postweld heat treatment (PWHT). The material of study is a pressure vessel steel ASTM A516 grade 70 that is used for gas metal arc welding. PWHT parameters examined in this study included PWHT temperatures and time. The resulting mater...

Grain refinement through severe plastic deformation enables synthesis of ultrahigh-strength nanostructured materials. Two challenges exist in that context: First, deformation-driven grain refinement is limited by dynamic dislocation recovery and crystal coarsening due to capillary driving forces; second, grain boundary sliding and hence softening occur when the grain size approaches several nan...

The aim of the present research is to simulate the heat treatment process of the autogenous grinding (AG) shell liner of Cr-Mo steel in different quenching media (still air, air blowing, oil and water) using ABAQUS software, in order to calculate the cooling curves. In this regard, the microstructure and hardness for each arbitrary point within the mill liner's bulk could be predicted based on ...

the growth rate of carbon nanotubes in chemical vapor deposition is simulated by using a theoretical analysis of the phonon vibration of the system. simulations demonstrate that the growth rate of carbon nanotubes with larger diameters is smaller because of higher damping factors and carbon nanotube inertia. an optimum temperature for the growth rate is calculated for a carbon nanotube on fe ca...

the blending of nr and br rubber blend with n330 carbon black is studied on curing behavior and the physico-mechanical properties of a sbr rubber based tire tread compound containing n234 carbon black. the effect of sulphur and accelerator contents on different properties of rubber compound is also tested with a wide range of curing agents. partial substitution of sbr with nr shows significant ...

economic growth and development of market, stock exchange and related variables are among components which influence on business, economic activities and management of society. financial repression is among economic variables greatly influencing on financial market specifically capital market and economic growth and development; so that, this concept caused to publish financial growth and devel...

this study was conducted with different levels (0, 0.25, 0.5,1,2 g) of zingiber officinale powder per 100 g of common carp commercial diet. feed was offered for 8 weeks by the post pelleting liquid spraying method. results showed that there were significant differences in all growth parameters and body composition except in survival rate, gain weight percent (gw%) ,sgr and nfe between treatment...