| Autor: |
Dhakshanamoorthy, Ravichandar, Krishnan Bommannan, Nagashanmugam, Thangavel, Balusamy |
| Předmět: |
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| Zdroj: |
Journal of Chemical Technology & Metallurgy; 2016, Vol. 51 Issue 3, p328-334, 7p |
| Abstrakt: |
Hydrogen induced cracks were among the defects observed by ultrasonic testing of medium carbon molybdenum steel at JSW Steel Limited, Salem Works (JSWSL). To reduce hydrogen concentration and hence hydrogen cracks in steel, a slow cooling technique was employed as hydrogen tends to escape during cooling due to its smaller atomic radius and high diffusivity in a solid phase. Cooling experiments were conducted wherein a few hot rolled bars of JDM1046 grade steel were slow-cooled while other bars were air-cooled. Hardness, microscopic and ultrasonic examinations were carried out on these bars after cooling. It was found that the bars slow cooling resulted in defect free steel against 15 % - 35 % defect levels observed in air-cooled bars. The hardness measurements indicated that the slow-cooled bars exhibited reduced hardness when compared to that of the air-cooled one. The paper discusses the results of experiments conducted to facilitate the elimination of hydrogen in JDM 1046 grade steel, which finds application in making crank shafts for automobiles. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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