Paper Title:
On Preparation of In Situ Composite Steel with Ultra-High Strength and its Thermal Stability
  Abstract

A new type of in-situ composite nano-multilayer plate with ultra-high strength (b 2112 MPa), Q235 steel plate with nano-layered structure of lath martensite produced by severe cold-rolling, was developed. After cold-rolling, subsequent annealing has great effect on the deformed lath morphology and grain refinement. Microstructure recrystallizing course have taken place after long time annealing at 350 °C. The recrystallization activation energy is 151 kJmol-1. Microstructure characteristics along rolling direction arrangement was decreased after annealing at 400 °C. In addition to the ultrafine ferrite grains, nano-carbides precipitated uniformly in the specimen annealed at 500 °C. Annealing at and above 600 °C resulted in coarse ferrite grains with spheroidized coarse carbides, causing grain growth. The average crystal size is about 4.7 m after annealing for 60 min at 600 °C.

  Info
Periodical
Advanced Materials Research (Volumes 152-153)
Edited by
Zhengyi Jiang, Jingtao Han and Xianghua Liu
Pages
436-440
DOI
10.4028/www.scientific.net/AMR.152-153.436
Citation
J. Zhao, H. Zhang, Z. Wang, H. Y. Zhai, Q. X. Wen, M. Wang, Y. W. Gao, "On Preparation of In Situ Composite Steel with Ultra-High Strength and its Thermal Stability", Advanced Materials Research, Vols. 152-153, pp. 436-440, 2011
Online since
October 2010
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Price
$32.00
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