Development of ultra-fine grained dual phase microalloyed steels through severe cold rolling and intercritical annealing

被引：0
|
作者：
Papa Rao Mondi
V. Subramanya Sarma
S. Sankaran
机构：
[1] Indian Institute of Technology Madras,Department of Metallurgical & Materials Engineering
来源：
Transactions of the Indian Institute of Metals | 2011年 / 64卷
关键词：
microalloyed steel; ultra-fine grains; cold rolling and annealing; dual phase steels;
D O I：
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学科分类号：
摘要：
A Nb-microalloyed structural steel with ferrite-pearlite microstructure was subjected to cold rolling and intercritical annealing to produce ultra-fine grained dual phase microstructure. Optical and transmission electron microscopy techniques were employed to characterise the microstructure. Initial results showed that the intercritical annealing (at 790°C for 90s) of samples rolled to a true strain of 2.4 resulted in a significant grain refinement from the average initial grain size of 20 μm to 1–2 microns. The microstructure primarily consisted of UFG ferrite matrix with homogeneously distributed islands of plate martensite with volume fraction of 27%.
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