Microstructural Evolution and Flow Behavior of 2205 and 2507 Duplex Stainless Steel during Double Pass Hot Compressive Deformation

doi:10.11901/1005.3093.2016.410

Chinese Journal of Materials Research

2016, Vol. 30

Issue (12): 888-896 DOI: 10.11901/1005.3093.2016.410

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Microstructural Evolution and Flow Behavior of 2205 and 2507 Duplex Stainless Steel during Double Pass Hot Compressive Deformation

Lixin WANG¹,Huabing LI²,Guoping LI¹,Zhengyou TANG^3,^*(

),Ming MA³

1. Shanxi Taigang Stainless Steel Co Ltd, Taiyuan 030003, China
2. School of Metallurgy, Northeastern University, Shenyang 110819, China
3. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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Lixin WANG,Huabing LI,Guoping LI,Zhengyou TANG,Ming MA. Microstructural Evolution and Flow Behavior of 2205 and 2507 Duplex Stainless Steel during Double Pass Hot Compressive Deformation. Chinese Journal of Materials Research, 2016, 30(12): 888-896.

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Abstract

Double passes hot compression tests of DSS2205 and SDSS2507 were conducted in order to investigate the microstructural evolution in the interval of hot deformation and its corresponding effect on the subsequent flow behavior of duplex stainless steels. The results indicated that, the higher deformation temperature(1200℃) decreased the stability of the austenite. As the holding time increased, the growth of ferritic recrystallized grains could be observed and the occurrence of γ→δ decreased the phase proportion of the austenite, which caused that the flow stress of DSSs in the second pass of hot compression decreased. In a lower temperature(1000℃), δ→γ became dominant and a large number of granular austenite formed in the grain boundary of the ferrite when the holding time increased and the growth of ferritic recrystallized grains was inhibited. During the second pass of compression, dislocations in the ferrite tangled around the phase boundaries between two phases due to the formation of granular austenite. Compared with the microstructural evolutions of DSS2205 and SDSS2507 at lower temperature, it was known that the increase of deformation resistance in the second pass deformation of DSSs was mainly related to the formation of the granular austenite.

Key words: metallic materials duplex stainless steel thermal deformation double passes hot compression flow stress static softening

Received: 19 July 2016

Fund: *Supported by National Key Technology Support Program No. 2012BAE04B01 High Technology Research and Development Program of China No. 2015AA034301 Fundamental Research Funds for the Central Universities Nos. N150204007&L1502034 National Natural Science Foundation of China No. 51574077.

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	Lixin WANG
	Huabing LI
	Guoping LI
	Zhengyou TANG
	Ming MA

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.410 OR https://www.cjmr.org/EN/Y2016/V30/I12/888

Table 1 Chemical compositions of tested steel (mass fraction, %)

Fig.1 Microstructures of DSS2205 and SDSS2507 alloys with different holding time after the first pass of compression: (a) DSS2205, 1200℃/0 s; (b) DSS2205, 1200℃/100 s; (c) DSS2205, 1100℃/0 s; (d) DSS2205, 1100℃/100 s; (e) DSS2205, 1000℃/0 s; (f) DSS2205, 1000℃/100 s; (g) SDSS2507, 1200℃/100 s; (h) SDSS2507, 1100℃/100 s; (i) SDSS2507, 1000℃/100 s

Fig.2 Volume fractions of austenite phase of DSS2205 and SDSS2507 alloys with different holding times and temperatures

Fig.3 Equilibrium phase diagram of DSS2205 (a) and SDSS2507 (b) alloys calculated by J-MAT Pro

Fig.4 Structures and morphologies of DSS2205 (a) and SDSS2507 (b) alloys with the holding time of 100 s at 1000℃

Fig.5 OM images of ferrite in DSS2205 and SDSS2507 alloys before and after holding 100 s (a) DSS2205, 1200℃/0 s; (b) DSS2205, 1200/℃/100 s; (c) DSS2205, 1000℃/0 s; (d) DSS2205, 1000/℃/100 s; (e) SDSS2507, 1200℃/100 s; (f) SDSS2507, 1000℃/100 s

Fig.6 TEM images of DSS2205 after holding for 100 s at 1200℃ (a) and 1000℃ (b)

Fig.7 Flow curves of DSS2205 and SDSS2507 under double-pass hot compression: (a) DSS2205, 1200℃; (b) SDSS2507, 1200℃; (c) DSS2205, 1100℃; (d) SDSS2507, 1100℃; (e) DSS2205, 1000℃; (f) SDSS2507, 1000℃

Fig.8 Static softening rate of DSS2205 and SDSS2507 with varying temperatures and holding time

Fig.9 Deformation resistance rate of DSS2205 and SDSS2507 between two passes with varying temperatures and holding times

Fig.10 Microstructure of DSS2205 after second pass hot deformation under the conditions of 1000℃/100 s

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