In situ metallography pdf file

Insitu metallography for the plant health assessment. In situ metallography and replication is used for microstructural analysis while examining large components that cannot be easily moved or when destructive sample preparation is difficult or not permissible. It is defined as in the natural or original position. In metallography, we also study the relation of structure to properties of metals or alloys. The micrograph shows a gray iron with e type graphite. It examines the use of adhesion tests in the evaluation of stresscorrosion cracking within bimaterial interfaces. Experimental insitu metallographic investigations of industrial. In situ metallography is required when the metallurgical damage must be evaluated on industrial equipment. Figure 9 shows the result of the in situ metallography.

Testing techniques for in situ environmental testing. The kit of insitu metallography comprises of portable grinder, light grinder with variable speed controller, electrolytic. Insitu metallography insitu metallography technique was developed as an alternative, nondestructive technique to study the microstructure. There is also the need of in situ metallography when repairs of. It is also applied to assess the useful remaining life of a component already in use. There is also the need of in situ metallography when repairs of equipment are been carrying out.

In metallography, we also study the relation of structure to properties of. Macroetching is a procedure for revealing the largescale structure of a metallic specimen, that is, the structure visible with the unaided eye, by etching an appropriately prepared surface. The boiler was out of operation for maintenance and in situ metallography. Subsequently, manual surface cleaning is carried out with an utmost care and then, it is ensured that surface is free from scratches. In situ metallography was used to nondestructively assess the metallurgical condition of several tubes within a boiler. The time and temperature are indicated on the left hand corner.

Damage mechanism like creep, fatigue, stress relaxation cracking, high temperature corrosion including hydrogen attack, intergranular. In situ metallography is a knowledge based ndt technique which can provide the early warnings of onset of many damages to the process and engineering industries. Pdf in situ metallography is required when the metallurgical damage must. In situ metallography of boiler tubes page 1 of 5 in situ metallography of boiler tubes summary material. Use of insitu metallography for plant health assessment studies. Pdf in situ metallography as nondestructive test to analyze the. The kit of in situ metallography comprises of portable grinder, light grinder with variable speed controller, electrolytic etcherpolisher, microscope and variety of consumables. Hybridization means the production of hybrid by crossbreeding. Adhesion testing mechanical testing and evaluation.

The testing allows quick onsite evaluation of a components metallurgical and heat treatment condition and assists investigators in carrying out a remaining life assessment study or a. In 1860 heneryclifton sorby developed a technique for the systematic examination of metals oralloys under the microscope and can therefore lay claim to be the founder of that branch of themetallurgy known as microscopical metallography. Here it is shown the in situ metallography on a plant equipment. When metallography carried out nondestructively and at the site without destroying the component itis known as insitu metallography. In situ metallography as nondestructive test for analyzing. It could be applied to study the microstructure of a finished component without impairing the integrity of the component. Insitu metallography allows us to view the microstructure of the components without extracting crosssections. The word in situ derived from latin word meaning in position. Insitu metallography is an alternative technique for studying the microstructure without impairing the integrity of.