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( Poonguzhali ),( Selvaraj ),( Munusamy Madhaiyan ),( Muthu Thangaraju ),( Jeoung Hyun Ryu ),( Keun Yook Chung ),( Tong Min Sa ) 한국미생물 · 생명공학회 2005 Journal of microbiology and biotechnology Vol.15 No.4
Corrosion fatigue behavior of type 316N stainless steel (SS) weldments on the damage characteristics is studied. The S–Ncurve of the fatigue life versus stress amplitude showed a specific two slope Basquin relationship. At low stress amplitude,the deformation microstructure consists mainly of planar slip dislocation structure and at high-stress amplitudes, planarmultiple slip dislocations govern the cyclic behavior. A correlation between microstructural changes and the correspondingsusceptibility of 316N SS weldment in as-welded condition towards environmental cracking in boiling acidified aqueoussolution has been presented. The objective of the present study is to investigate the environmental effects on the corrosionfatigue crack initiation of type 316N weldmetal under the influence of cyclic stress amplitude. The difference in deformationmicro mechanisms with stress amplitude in a corrosive environment is believed to be the major reason for the occurrence ofa specific bilinear Basquin relationship in the S–N curve.
Toxic gas has a median fatal concentration in the oxygen of much more than 200 parts per million (ppm) but far less than 2000 ppm by volume of gas. Many industries, mines and thermal plants emit perilous gases that are more harmful to our human life. The Proposed nanosensor senses the various perilous gases and averts many accidents. In this paper, a two-dimensional Photonic Crystal (2D-PhC) resonator and PhC-based poisonous gas sensor based on the hexagonal and square crystal lattice are built-in smart way. The PhCs are artificial constructs of any material with an occasional enunciation of refractive index (RI). It has effective light manipulation and it would be helpful to obtain light migration in the handling of sensing applications. The TE/TM wave transmission can shift as per the RI value of different gases in the PhCs. The wavelength variations obtained agree well with the Finite Difference Time Domain (FDTD) study, and the simulation is performed by the tool RSoft. The spectral variables such as quality factor (QF), sensitivity (Se), transmitted output power and detection limit (DL) are evaluated using the RI value over the spectrum of different toxic gases. The proposed square crystal structure have acquired a QF range of 500.6, high efficiency of 99%, and a better Se of 716.6 nm/RIU at 1502 nm. The designed hexagonal crystal structure have acquired a QF range of 165.8, high efficiency of 99%, and a better Se of 798.24 nm/RIU at 1630 nm respectively. The DL for both the proposed sensors is very low. So, the designed smart sensor helps promptly recognize the contaminated gases in several places. The proposed nanosensor is helpful in industrial safety, health care applications, aerospace, agricultural, transportation, environmental monitoring, thermal plants and mines.
In this work, the corrosion and creep properties of weld beads produced on AA5083-H111 alloy using SpinArc gas metalarc welding process were analyzed. For that, bead on plate welding was carried out considering welding current, filler spindiameter and filler rotation speed as input parameters. It is evident from the microstructures that change in filler spin diameterand filler rotation speed altered the shape of weld bead irrespective of welding current. Also, porosities were formed atboth side walls where the columnar dendrites grow upward while the equiaxed dendrites zone contains comparatively fewerporosities. On comparing the left and a right side wall, a higher density of porosities are observed at the right side wall andthe direction of rotation was expected to be responsible for this occurrence. The pitting morphology of both side walls wasnot similar due to the variance in concentration of Mg and a higher amount of Mg exists on the right side wall led to theprecipitation of Mg-rich rich particles result in severe corrosion. A welding current of 130 Amps, the filler rotation speed of1050 rpm and filler spin diameter of 2 mm produced a high density of dislocations and a higher number of Fe and Mn-richintermetallics at grain interiors as well as grain boundaries, thereby, results in improved corrosion and creep properties ofweld. The weld contains larger porosities results in poor corrosion and creep properties.