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Microstructure and cleavage in lath martensitic steels.

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Title: Microstructure and cleavage in lath martensitic steels.
Authors: Morris, John W1 (AUTHOR) jwmorris@berkeley.edu, Kinney, Chris1 (AUTHOR), Pytlewski, Ken1 (AUTHOR), Adachi, Y2 (AUTHOR)
Source: Science & Technology of Advanced Materials. 2013, Vol. 14 Issue 1, p1-N.PAG. 9p.
Subjects: Martensitic stainless steel, Grain size, Fracture mechanics, Brittle fractures
Abstract: In this paper we discuss the microstructure of lath martensitic steels and the mechanisms by which it controls cleavage fracture. The specific experimental example is a 9Ni (9 wt% Ni) steel annealed to have a large prior austenite grain size, then examined and tested in the as-quenched condition to produce a relatively coarse lath martensite. The microstructure is shown to approximate the recently identified 'classic' lath martensite structure: prior austenite grains are divided into packets, packets are subdivided into blocks, and blocks contain interleaved laths whose variants are the two Kurjumov-Sachs relations that share the same Bain axis of the transformation. When the steel is fractured in brittle cleavage, the laths in the block share {100} cleavage planes and cleave as a unit. However, cleavage cracks deflect or blunt at the boundaries between blocks with different Bain axes. It follows that, as predicted, the block size governs the effective grain size for cleavage. [ABSTRACT FROM AUTHOR]
Copyright of Science & Technology of Advanced Materials is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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  Data: Microstructure and cleavage in lath martensitic steels.
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  Data: <searchLink fieldCode="AR" term="%22Morris%2C+John+W%22">Morris, John W</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jwmorris@berkeley.edu</i><br /><searchLink fieldCode="AR" term="%22Kinney%2C+Chris%22">Kinney, Chris</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pytlewski%2C+Ken%22">Pytlewski, Ken</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adachi%2C+Y%22">Adachi, Y</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Science+%26+Technology+of+Advanced+Materials%22">Science & Technology of Advanced Materials</searchLink>. 2013, Vol. 14 Issue 1, p1-N.PAG. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Martensitic+stainless+steel%22">Martensitic stainless steel</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+size%22">Grain size</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+mechanics%22">Fracture mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Brittle+fractures%22">Brittle fractures</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this paper we discuss the microstructure of lath martensitic steels and the mechanisms by which it controls cleavage fracture. The specific experimental example is a 9Ni (9 wt% Ni) steel annealed to have a large prior austenite grain size, then examined and tested in the as-quenched condition to produce a relatively coarse lath martensite. The microstructure is shown to approximate the recently identified 'classic' lath martensite structure: prior austenite grains are divided into packets, packets are subdivided into blocks, and blocks contain interleaved laths whose variants are the two Kurjumov-Sachs relations that share the same Bain axis of the transformation. When the steel is fractured in brittle cleavage, the laths in the block share {100} cleavage planes and cleave as a unit. However, cleavage cracks deflect or blunt at the boundaries between blocks with different Bain axes. It follows that, as predicted, the block size governs the effective grain size for cleavage. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Science & Technology of Advanced Materials is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1468-6996/14/1/014208
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      – Code: eng
        Text: English
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        PageCount: 9
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    Subjects:
      – SubjectFull: Martensitic stainless steel
        Type: general
      – SubjectFull: Grain size
        Type: general
      – SubjectFull: Fracture mechanics
        Type: general
      – SubjectFull: Brittle fractures
        Type: general
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      – TitleFull: Microstructure and cleavage in lath martensitic steels.
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              M: 02
              Text: 2013
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