Connectivity of slip systems between different phases in ferrite–martensite dual-phase steels

Sakai, Shota; Morito, Shigekazu; Ohba, Takayoshi; Yoshida, Hiromi; Takagi, Shusaku

doi:10.1016/j.jallcom.2012.02.027

Cited by 9 publications

(10 citation statements)

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“…It means that the block thickness decreases with decreasing the prior austenite grain size. This is the same tendency as the results reported by Morito et al 15) for low carbon martensitic steels and by Sakai et al 12) for the DP steel produced by hot rolling and annealing.…”

Section: Microstructure Of Ca Specimensupporting

confidence: 91%

“…In Chapter 3, the results of the present research show the same tendency of the relationship between the prior austenite grain size and the block thickness as that described in previous reports such as Morito et al 15) and Sakai et al 12) The results, which were measured in the papers above, are summarized in Table 2, and the effect of the prior austenite grain size on the block thickness of martensite is shown in Fig. 13.…”

Section: Effect Of Microstructure On Prior Austenite Grainsupporting

confidence: 87%

“…Sakai et al 11,12) clarified the crystallography of martensite in the hot-rolled and annealed DP steel. However, cold rolling is usually performed after hot rolling to obtain a target thickness, surface qualities and so on to produce practical steel sheets.…”

Section: Crystallographic Analysis Of Lath Martensite In Ferrite-martmentioning

confidence: 99%

“…17) On the other hand, Sakai et al 11,12) carried out an analysis of the martensite microstructure in the DP steel and the orientation relationship between ferrite and martensite in HR specimens and annealed specimens after hot rolling (hereinafter, hot-rolled and annealed; HRA specimens). The results revealed there was a close-packed plane parallel relationship between the {110} M common close-packed planes of martensite blocks in the martensite packets, i.e.…”

Section: Orientation Relationship Between Ferrite and Martensitementioning

confidence: 99%

“…As a result of these analyses, it was found that about 30% of martensite packets had a close-packed plane parallel relationship with the adjacent ferrite. Because the percentage of martensite packets and adjacent ferrite pairs which had the close-packed plane parallel relationship was 40% in hot-rolled and annealed materials, 11,12) the close-packed plane parallel relationship between the martensite packets and their adjacent ferrite grains in the CA material is a little weak in comparison with hot-rolled and annealed materials.…”

Section: Orientation Relationship Between Ferrite and Martensitementioning

confidence: 99%

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Crystallographic Analysis of Lath Martensite in Ferrite-Martensite Dual Phase Steel Sheet Annealed after Cold-Rolling

Yoshida¹,

Takagi²,

Sakai

et al. 2015

ISIJ Int.

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Cold-rolled and annealed ferrite-martensite dual phase (DP) steel sheets are useful for automotive applications because of their excellent balance of strength and elongation. Although martensite in ferrite-martensite DP steels has important roll in the mechanical properties, the crystallography and microstructure of lath martensite in DP steels have not been investigated in detail. In this paper, the crystallography and microstructure of lath martensite in a ferrite-martensite DP steel were studied using electron microscopy and electron diffraction analysis, and the crystallographic orientation relationship between the ferrite and martensite was analyzed. The main results are as follows: (1) The lath martensite in DP steels consists of some packets, each of which contains several blocks. This structure is the same as that of lath martensite in fully martensitic steels. (2) The common parallel close-packed plane of the martensite laths in a packet tend to be parallel to the close-packed plane of the adjacent ferrite grain, whose fraction is about 30%.KEY WORDS: crystallography; lath martensite; dual phase steel; SEM/EBSD; orientation relationship between ferrite and martensite.

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Section: Microstructure Of Ca Specimensupporting

confidence: 91%

Section: Effect Of Microstructure On Prior Austenite Grainsupporting

confidence: 87%

Section: Crystallographic Analysis Of Lath Martensite In Ferrite-martmentioning

confidence: 99%

Section: Orientation Relationship Between Ferrite and Martensitementioning

confidence: 99%

Section: Orientation Relationship Between Ferrite and Martensitementioning

confidence: 99%

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