Krishnan, A and Dutta, S and Subramanian, K and Panda, A K and Murugaiyan, Premkumar and Roy, R K (2018) Evaluation of Microstructural and Mechanical Behaviours of Tempered 2.25Cr-1Mo Steel Through Electromagnetic Characterization. Transactions of the Indian Institute of Metals , 71(10) (IF-1.176). pp. 2395-2402.
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The effect of tempering treatment has been investigated on water quenched P22 steel with the chemical composition of 0.13C, 0.24Si, 0.47Mn, 0.012P, 0.005S, 2.19Cr, 0.93Mo and balance Fe (all in wt%) within the temperature ranges of 650–900 °C. The microstructural, mechanical and magnetic properties of as-quenched and tempered steels have been investigated through optical and scanning electron microscopy, hardness and universal tensile testing, electromagnetic sensor (Magstar), respectively. The water quenched sample consists of fine martensitic structure with a hardness of 381 HV. With the progress of tempering, the martensite becomes coarse till 800 °C, decreasing the hardness of steel samples. The tempering at 700 °C results in martensite coarsening and precipitation of rod and globular shaped carbides; while a fraction of globular carbide is observed to increase in the matrix after 750 °C of tempering. Beyond 800 °C, the ferrite and bainite phases gradually form by replacing martensite, and the ferrite structure is prevalent after 900 °C. Due to microstructural changes, the magnetic properties are also affected as a function of tempering temperature. The coarsening of martensite causes the decrease in coercivity with increasing tempering temperature, leading to magnetic softening.
|Uncontrolled Keywords:||Microstructures;Tempering;Magnetic;Barkhausen emission ;Coercivity ;Hardness Tensile strength|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||20 Sep 2019 13:22|
|Last Modified:||20 Sep 2019 13:22|
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