Textural Changes through Grain Growth in Ti-bearing IF-steel Investigated by Orientation Imaging Microscopy and X-ray Diffraction.

• Samajdar I.

  Department MTM, Katholieke Universiteit Leuven

• Verlinden B.

  Department MTM, Katholieke Universiteit Leuven

• Houtte P. Van

  Department MTM, Katholieke Universiteit Leuven

Abstract

Textural changes were investigated using X-ray diffraction and orientation imaging microscopy (OIM). During normal grain growth, slight increase in γ-fibre (ND//<111>) was observed. Prolonged annealing and a resultant abnormal grain growth, however, decreased γ and increased α (RD//<110>). The decrease/increase in fibres were mainly caused by corresponding changes in F [{111}<112>] and I [{112}<110>] orientations, while E [{111}<110>] and H [{001}<110>] components did not change significantly. OIM characterization of grain boundary nature indicated an approximate increase in the fraction of low angle (<20°) boundaries with increasing annealing time. At the initiation of abnormal grain growth, the fraction of low angle boundaries (specially those with 1-5° misorientation) were observed to have reached a relatively large value. Such observations may fit well with a simple scheme: the transient strengthening in γ-fibre was possibly caused by normal grain growth of γ-grains. At the later stages of grain growth, the growth of the γ-grains was possibly inhibited/stopped by grains of similar orientations. This, in turn, may increase the fraction of low angle boundaries. When the fraction of low-angle/low-mobility boundaries reached a critical value, growth of certain grains (as F/E in our case) were inhibited/pinned, while few of the more favourable placed/oriented grains could grow abnormally. Measured values of 'free length', defined as the average distance between an i (where i may be F/E/I/H) and a j (where j is less than 20° misoriented with i) grain, showed the highest value for I and the lowest for F. Free length can be considered as an average distance for non-interrupted growth. Highest free length values for I, caused by the spatial locations, possibly favored abnormal grain growth of I grains.

Journal

• ISIJ International

  ISIJ International 37 (10), 1010-1015, 1997

  The Iron and Steel Institute of Japan

Keywords

• grain growth
• texture
• IF-steel
• α-fibre (I [{112}<110>] and H [{001}<110>] components)
• γ-fibre (F [{111}<112>] and E [{111}<110>] components)
• microtexture
• free length

Details

• CRID: 1390282681428903168
• NII Article ID: 10002457258
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.37.1010
• ISSN: 13475460
• ISSN: 09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/37/10/37_10_1010/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed