IDL - International Digital Library Of Technology & Research Volume 1, Issue 3, Apr 2017
Available at: www.dbpublications.org
International e-Journal For Technology And Research-2017
Study on Influence of heat treatment on Tribological properties of mild steel Mr. SriramMukunda1, AmanSuryan2, Hareesh Nair2, Sanjeev Kumar2, Siddharth sanu2 1 Asst. Professor, Dept. Of Mechanical engineering, NitteMeenakshi institute of technology 2 BE students, Dept. of Mechanical engineering, NitteMeenakshi institute of technology Bangalore, India
Keywords: heat treatment, microstructure, wear, hardness, tensile strength
Abstract:A study was made on the effect of heat treatment upon the mild steel. Total six samples were prepared for each test (hardness test, tensile test, microstructure test and wear test) from those two was tested as received and rest four were subjected to different heat treatment that are annealing and normalizing (heated on a temperature of 850 degree Celsius). The hardness of all sample was measured by Rockwell hardness testing machine. Wear measurement was done on pin-on disc wear machine. Tensometer was used to find out the ultimate stress and strain of the sample. The result of tensile test showed that the strength is decreased by heat treating and the surface hardness is also decreased by heat treatment. Microstructure of the mild steel specimens shows the grain boundary of the particles and the content of % of carbon present. It justifies the experimental results of tensile test and hardness test. Surface Hardness is the measure of resistance that any material applies. As the specimen gets soft on treating the hardness also gets decreased. Tensile strength of any specimen is specified as how much stress the material can withstand before breaking. As the metal gets soft after heat treatment the load required for breaking goes on decreasing. Wear test is carried out to see the variation in wear measurement and coefficient of friction as the mesh size of paper are varied. More soft the surface of material is more wear is seen and vice-versa.
IDL - International Digital Library
1. INTRODUCTION Sliding, Over 500 million tonnes of low carbon steels are produced yearly around the world; they are used for most of the engineering applications. Low carbon steels are utilized to produce cars body panels, tubes, domestic appliance side panels and other engineering applications because they are readily available, workable and weldable [1]. Furthermore, low carbon steel also called mild steel have carbon content below 0.2 per cent, and manganese content below 0.7 per cent, with maximum values for silicon, phosphorus and sulphur at 0.6, 0.05 and 0.05 per cent respectively. The performance of low carbon steel in service depends on inherent factors which include its grain size, presence of defects, its chemical composition, ultimate Tensile strength, etc. as well as extrinsic factors. Studies have also shown that failure of carbon steels can result from production methods, use of substandard material, poor design, manufacturing errors due to poor machining, or failure from a phenomenon called fatigue [2, 3]. Sequentially, to forestall these failures, the mechanical properties can be changed as desired by heat treatment [4]
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