Intergranular Corrosion in Stabilized 310 Stainless Steel

The intergranular corrosion in stabilized 310 stainless steel polycrystals has been investigated from a view point of crystallographic structure of the grain boundary. The relative orientation of each grain was characterized by the Coincidence Site Lattice (CLS) model, and the Plane Matching model. For the quantitative characterization of corrosion, a scanning electron microscope with two secondary electron detectors was used to provide the profile of the corrosion groove. It was found that Σ= 3 boundaries and some certain CSL boundaries have a high resistance against the intergranular corrosion. The “random” boundaries were corroded in a different extent, particularly high corrosivity. It is concluded that the grain boundaries having low Σ-values do not necessarily provide low corrosivity. It is shown that the dissolution rate depending on the surface orientation of grains also plays an important role in the morphology of intergranular corrosion, and was found to be lowest at (100) and increases as the surface normal changes towards (110), and more so towards (111)

Perception analysis of living environment at Taman Melati residential area

Rapid physical development in a residential area will deteriorate living environment of the residents especially if it takes place haphazardly without applying adequate planning guidelines. It will, eventually, exert more pressure on physical infrastructure of the area. As a result, residents of the area will be subjected to dissatisfaction on the present supporting infrastructure as the demand exceeds the supply. Evidently, it may lead to poor living conditions of the area, which ultimately slow the progressiveness of the society to achieve the quality of living standards. This paper investigates residents’ perceptions on present living environmental setting at Taman Melati residential area in Kuala Lumpur. Questionnaire survey was administered to determine the perceptions of the residents on physical environmental parameters such as air, noise, streetlight illuminance, and traffic volume. The level of satisfaction of the residents on the living environment had showed nearly 64% of the respondents expressed “satisfied strongly” or “satisfied”. The level of willingness of the residents to stay further continuously at Taman Melati indicates about 56% of the respondents expressed “strongly willing” or “willing”. It is also seen that the overall satisfaction level of the residents on the living environment was high albeit satisfaction level on individual physical environmental parameters was low