Journal of Iron and Steel Research. 2014, (11) Core

Defection in Low Brittle Temperature Zone of Nb-Ti Micro-Alloyed Steel SlabChinese Full Text

XU Rui;SUN Yan-hui;ZENG Ya-nan;CAI Kai-ke;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;

Abstract: The morphologies,sizes and quantities of the precipitations in Nb-Ti micro-alloyed steel slab were studied systematically by using metallographic microscope,carbon extraction replicas,SEM and TEM.The hot ductility in low brittle temperature zone of the steel was also tested by Geelble-1500.The results show that when temperature is in the range from 950 to 700 ℃,the lowest value of RA is 25.7%.The precipitations are mainly TiN and Nb（CN）,and their sizes are about 50 nm at 950 ℃.With temperature decreasing,the quantity of the particles increases from 51 to 580/μm2 while the size decreases.At 975 ℃,the tensile strength and critical stress are58.3and 61.0 MPa respectively.Over 975 ℃,the critical stress is smaller than the tensile strength,it is difficult to produce inter-granular failure.Under 975 ℃,it is apt to produce inter-granular failure when the critical stress for grain deformation is larger than the tensile strength.

Keywords：

micro-alloyed steel; low brittle temperature zone; precipitation; critical stress;

DOI：
10.13228/j.boyuan.issn1001-0963.20140063
Series：
Subject：
Classification Code：
TG245

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Defection in Low Brittle Temperature Zone of Nb-Ti Micro-Alloyed Steel SlabChinese Full Text

XU Rui;SUN Yan-hui;ZENG Ya-nan;CAI Kai-ke;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;

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