Effect of transformation temperature and accelerated cooling on development of strength in plain carbon steel with ferritic structure

 A. LANJEWAR, PRANAV TRIPATHI, D. SATISH KUMAR, M. SINGHAI, P. K. PATRA

 ABSTRACT

The influence of accelerated cooling and coiling temperature is studied in a microalloyed steel grade in order to investigate the strengthening owing to phase transformation in the presence of microalloying elements. A Nb-V microalloyed steel grade was deformed in the austenitic range followed by controlled quenching to simulate rolling and runout table cooling conditions. Cooling rate was varied from 100 to 150 °C/sec, while coiling temperatures were varied between 475 to 625 °C, with 25 °C step. Decrease in transformation temperature in conjunction with accelerated cooling resulted in non-equiaxed ferrite structures with array of phase morphologies. Intermediate transformation temperatures produced increase in strength concurrent with observed peak broadening in X-ray dif- fraction. In addition, microstructural modelling is done using Quench properties module of JMatPro under experi- mental conditions.

(xem chi tiết bài tiếng anh trên tạp chí  in số 81 ra tháng 12/2018)

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