In:
Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 415-417 ( 2011-12), p. 793-799
Abstract:
A novel microalloy Q & P steel with Nb and Mo is designed. The dilatometric curves of low-carton microalloyed Q & P steel with and without Nb and Mo are detected at different cooling rates on DIL-805 thermal dilatometer．The CCT curves are determined using thermal dilation measurement, microstructure observation and hardness measurement. In the Q & P process, the niobium carbide precipitate plays a precipitation strengthening effect, so the tensile strength of Q & P steel is enhanced. The results show that: The element Nb decreases the phase-transformation temperatures of ferrite and pearlite, which leads the proeutectoid ferrite and pearlite phase transformation finish lines to move to lower-right. For the low-carton Q & P steel microalloyed with Nb and Mo, when cooling rate is higher than 5°C•s －1 , the microstructures is only martensite. Its excellent hardenability is propitious to improve the strength of the Q & P steel. While, for the traditional C-Si-Mn Q & P steel, the martensite can be only obtained until the cooling rate higher than 20°C•s －1 .
Type of Medium:
Online Resource
ISSN:
1662-8985
DOI:
10.4028/www.scientific.net/AMR.415-417
DOI:
10.4028/www.scientific.net/AMR.415-417.793
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2011
detail.hit.zdb_id:
2265002-7
