Evaluation of tempering behaviour in modified 9Cr–1Mo steel by magnetic non-destructive techniques
作者： Harendra Kumar , J.N. Mohapatra , Rajat Kumar Roy , R. Justin Joseyphus , Amitava Mitra
DOI: 10.1016/J.JMATPROTEC.2009.12.003
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摘要: Abstract Modified 9Cr–1Mo steels were normalized at 1050 °C/30 min and tempered over a wide range of temperatures to observe the effect tempering temperature on material properties. The revealed mechanical softening when less than lower critical (∼810 °C: Ac1). Beyond Ac1 materials strength increased drastically due formation fresh martensite. Magnetic Hysteresis Loop (MHL) Barkhausen Emissions (MBE) techniques used evaluate magnetic properties with tempering. was observed by below where decrease in coercivity an increase RMS voltage MBE found. Tempering beyond hardening MBE. Such results that could be better tool for evaluation modified steel.
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