Microstructural Evaluation of High-strength Bainitic
Steel by Nondestructive Techniques
Publication: Publication Date: 1 November 2016Testing Method: ,
Phase transformation in 28Cr3SiNiWMoV steel
was studied by utilizing different techniques.
Appropriate heat treatment cycles were employed
to understand the microstructural changes within
the high-strength steel. It was observed that the
austenite formation started at 1073 K (800 °C) and
completed at approximately 1123 K (850 °C).
Further, on cooling in the furnace from the
austenitic range, it was noted that the resultant
structure was bainitic, having hardness greater
than 450 Hv. Nondestructive analysis of the
samples treated at different heat treatment
temperatures revealed that there is a good correlation
between the metallurgical changes and the
ultrasonic longitudinal velocity. This study can be
used to evaluate the hardness of the material
without any destructive testing.
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