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Kumar Sanjeev, Pandey Chandan, Goyal Amit

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 3

506--532

This paper investigates the metallurgical behavior and mechanical properties of the P91 steel welds joint. The joint of heat-resistant P91 steel has been welded by the gas tungsten arc welding (GTAW) process using the dissimilar Inconel grade 617 filler. The P91 welds joints have been subjected to varying heat treatment regimes in the temperature range of 650–810 °C for 2 h. The normalizing-based tempering was also performed for the welded joint. The weld fusion zone (WFZ) with austenitic structure and heat-affected zones (HAZs) with martensitic structure was characterized using the optical microscope and scanning electron microscope (SEM). The detailed characterization of the weld metal and HAZ interface has also been performed for as-welded and post-weld heat treatment (PWHT) conditions. For mechanical properties of the welds joint, tensile testing and hardness testing were performed. The relationship between mechanical behavior and microstructure of the welded joint has been evaluated for as-welded and heat treatment conditions. The microstructure studies revealed the formation of an unmixed zone (UZ) close to the fusion line, and it was characterized as peninsula and island. The WFZ showed the complete austenitic mode of the solidification and revealed the austenitic structure with cellular and equiaxed grains in the center of the weld metal. The columnar and cellular dendrites were seen near the boat fusion line, i.e., interface of the weld metal and HAZ. The soft δ ferrite patches were observed near the fusion line in the area of HAZ and remain undissolved up to tempering temperature of 810 °C (PW 3). The dissolution of the ferrite patches was noticed for PW 4. The maximum and minimum tensile strength of the welds joint was measured 731 MPa and 502 MPa for PW 3 and PW 2, respectively. A uniform hardness variation in the transverse direction of the welded joint was observed for PW 3 and PW 4 conditions. The optimum combination of strength and ductility was obtained for the PW 3 condition.

Application of MADM Methods for Selecting the Best Private Institution for Professional Courses in Uttarakhand State, India

Kumar Sanjeev, Badoni Rakesh P., Mohan P. J.

Annals of Computer Science and Information Systems

2017

Vol. 10

229--233

Engineering and doctoral courses are considered to be golden professions for successful life. India is the largest Engineers' producing country, with changing technology, education system also has been changed from Gurukul to new modern technology based teaching system. Learning and knowledge are correlated terms, which go side by side and have imperative value and learning right knowledge from the best educational institute plays a vital role in one's life. IIT's, NIT's and Govt. institutes could not accommodate all the aspirants who have dreamed to be an engineer, certainly they are required to take admission in some private institutions. Due to numerous engineering institutes and universities this becomes a tedious job for both the parents and aspirants to select a perfect institution. Multi Attribute Decision Making (MADM) methods provide a ranking of the available alternatives thereby, decision of critical thinking become easier. The present paper examines the application of few MADM paradigms for selecting the most suitable academic institution, four state private universities of state Uttarakhand are considered as alternatives and evaluated and prioritized on seven major criterions. References