Grain Size Effect on Microstructure Evolution and Properties of 304 Austenitic Stainless Steel

doi:10.11901/1005.3093.2019.446

Chinese Journal of Materials Research

2020, Vol. 34

Issue (3): 231-240 DOI: 10.11901/1005.3093.2019.446

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Grain Size Effect on Microstructure Evolution and Properties of 304 Austenitic Stainless Steel

SUN Jingli(

),ZHOU Haitao,CHEN Li,WU Hong,LIU Weili,YAO Fei,XU Yuling

Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600，China

Cite this article:

SUN Jingli,ZHOU Haitao,CHEN Li,WU Hong,LIU Weili,YAO Fei,XU Yuling. Grain Size Effect on Microstructure Evolution and Properties of 304 Austenitic Stainless Steel. Chinese Journal of Materials Research, 2020, 34(3): 231-240.

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Abstract

304 austenitic stainless steel was pre-heated in the conditions of different temperatures and time to produce samples with close texture but different grain size. Then the effect of the subsequent compression and heat treatment on the microstructure evolution and properties of the obtained samples was investigated. Results show that the initial grain size played an important role in the final texture of the sample after deformation and heating. The texture in the initial sample with coarse grains changed much more than that in the sample with finer grains. For the samples with close textures, grain size has greater effect on their tensile strength; For samples with different texture, the texture has greater effect on mechanical properties rather than the grain size and micro stain. During the deformation and subsequent heating, the increase of macro strain within the grains and high angle boundaries with high energies lowered the corrosion resistance of 304 steel. However, after deformation, the preferred orientation texture with four planes of close-packed lattice emerged on the samples, thereby, the corrosion resistance of the steel could be increased to some extent.

Key words: metallic materials microstructure EBSD grain size grain boundary engineering

Received: 15 September 2019

ZTFLH:

TB31

Fund: Shanghai Pujiang Program(15PJ1433600)

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	Jingli SUN
	Haitao ZHOU
	Li CHEN
	Hong WU
	Weili LIU
	Fei YAO
	Yuling XU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.446 OR https://www.cjmr.org/EN/Y2020/V34/I3/231

Fig.1 Schematic diagram describing the sample cutting direction

Fig.2 Orientation maps of R1-1# (a) and R1-2# (b)

Fig.3 Inverse pole figures of R1-1#, RD (a); R1-2#, RD (b); R1-1#, ND (c); R1-2#, ND (d); R1-1#, TD (e) and R1-2#, TD (f)

Table 1 Intial mechanical properties of pre-heated samples

Fig. 4 Map showing the microstructure of R2-1#-10% (a) band contrast, (b) IPFX+GB and (c) inverse pole figures

Fig.5 Map showing the microstructure of R2-2#-10% (a) band contrast, (b) IPFX+GB and (c) inverse pole figures

Fig.6 Map showing the microstructure of R3-1#-10% (a) IPFX+GB, (b) grain boundaries and (c) inverse pole figures

Fig. 7 Map showing the microstructure of R3-2#-10% (a) IPFX+GB, (b) grain boundaries and (c) inverse pole figures

Table 2 Length of the grain boundaries per unit area

Table 3 Fraction of special grain boundaries per unit area

Table 4 Maximum orientation distribution for different sam-ples

Table 5 Mechanical properties of deformed and heated samples

Fig.8 Surface topography after pitting experiment for specimen (a) R1-1#; (b) R1-2#; (c) R3-1#-10%; (d) R3-2#-10%

Table 6 Experiment data for the pitting corrosion test

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