QUANTITATIVE ANALYSIS FOR THE DISPLACEMENT OF TENT–SHAPED SURFACE RELIEF OF LATH MARTENSITE IN Fe–BASED ALLOY

Acta Metall Sin

2009, Vol. 45

Issue (12): 1425-1434 DOI:

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QUANTITATIVE ANALYSIS FOR THE DISPLACEMENT OF TENT–SHAPED SURFACE RELIEF OF LATH MARTENSITE IN Fe–BASED ALLOY

WU Jing ¹; LIU Xinxin ¹; GU Xinfu ¹; DAI Fuzhi ¹; YANG Haitao ²; ZHANG Wenzheng ¹

1. Laboratory of Advanced Materials; Department of Materials Science and Engineering; Tsinghua University;Beijing 100084
2. Tsinghua–Foxconn Nanotechnology Research Center; Tsinghua University; Beijing 100084

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WU Jing LIU Xinxin GU Xinfu DAI Fuzhi YANG Haitao ZHANG Wenzheng. QUANTITATIVE ANALYSIS FOR THE DISPLACEMENT OF TENT–SHAPED SURFACE RELIEF OF LATH MARTENSITE IN Fe–BASED ALLOY. Acta Metall Sin, 2009, 45(12): 1425-1434.

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Abstract

Lath martensite with a dislocation substructure is one of the most common forms of martensite in structural steels. Surface relief has been regarded as an important characteristic in the martensitic transformation. Crystallographic features on surface relief are essential to get into deep insight of the long range strain field in the transformation, and explore the mechanism of the phase transformation. However, very limited experimental data on the shape strain associated with the formation of surface relief caused by the lath martensite have been reported so far, especially for the quantitative study of the displacement vector. The present investigation was carried out to study the shape deformation in the formation of the lath martensite on the austenite matrix in an Fe–20.2Ni–5.5Mn (mass fraction, %) alloy. The shape strain accompanying surface relief, such as the magnitude and direction of the displacement vector, has been concerned in a quantitative way. The morphology of the relief was studied by the optical microscope (OM) and the atomic force microcope (AFM). The orientations of the matrix grain and the lath were measured by the electron backscattered diffraction (EBSD), respectively, which was used to determine the orientation of the habit plane, and the orientation relationship (OR) between the lath martensite and its neighboring matrix. Combing the data from EBSD and AFM, it is concluded that the relief is produced by a single bcc crystal, which exhibits a tent-shaped relief. Based on an electron backscattered diffraction analysis, the ustenite/martensite orientation relationship is found to be in the closer vicinity of K–S orientation relationship, which is consistent with that in bulk materials obtained by transmissin electron microscope (TEM), and the habit plane is determined to be near (111)_f . The largest shear angle for the relief is calculated to be 27.49°, and the directions of comined displacement vector are scattered around [121]_f . However, the bserved maximum surface tilt angle is 22.41°, which is smaller than the calculated value. Considerinthe habit plane is not perpendicular to the pre–polishing surface, the measured smaller value f tilt angles is reasonable.

Key words: phase transformation lath martensitesurface relief shape strain

Received: 21 July 2009

ZTFLH:

O71

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Supported by National Natural Science Foundation of China (No.50671051)

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	WU Jing
	LIU Xin-Xin
	GU Xin-Fu
	DAI Fu-Zhi
	YANG Hai-Shou
	ZHANG Wen-Zheng

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I12/1425

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