Custom 450钢热加工图及显微组织分析

doi:10.13228/j.boyuan.issn0449-749x.20200612

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Abstract In order to explore the best thermal deformation range of Custom 450 high-strength stainless steel to guide industrial production,the hot deformation test of Custom 450 steel was performed by a Gleeble-3800 thermal-mechanical simulator under the conditions of a temperature range of 900-1 200 ℃ and a strain rate range of 0.01-10 s^-1.The applicability of Prasad and Murty instability criteria in Custom 450 steel was studied,and the best thermal deformation parameter interval and plastic instability mechanism were determined. A large number of local deformation bands and "necklace" structures formed when deformed at a strain rate range from 0.2 s^-1 to 10 s^-1 and a deformation temperature range from 900 ℃ to 1 080 ℃,which was the main reason in leading to the plastic instability. The Murty instability criteria was used in constructing the processing map of Custom 450 steel because the plastic instability zone predicted by the Murty criterion are more consistent with microstructure observation. Then,the optimal hot deformation conditions were also determined as 1 050-1 200 ℃,0.1-1 s^-1,1 100-1 200 ℃,and 1-10 s^-1.

Key words： high-strength stainless steel hot deformation stress-strain curve processing map plastic instability

Received: 16 December 2020

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200612 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I6/112

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