Influence of Microbands Refined Microstructure and Two Phase Microstructure on High Temperature Fracture Behaviors of a Low Cr Alloy Steel

doi:10.11901/1005.3093.2019.428

Chinese Journal of Materials Research

2020, Vol. 34

Issue (1): 21-28 DOI: 10.11901/1005.3093.2019.428

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Influence of Microbands Refined Microstructure and Two Phase Microstructure on High Temperature Fracture Behaviors of a Low Cr Alloy Steel

CHENG Lei(

),YU Wei,CAI Qingwu

Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

CHENG Lei,YU Wei,CAI Qingwu. Influence of Microbands Refined Microstructure and Two Phase Microstructure on High Temperature Fracture Behaviors of a Low Cr Alloy Steel. Chinese Journal of Materials Research, 2020, 34(1): 21-28.

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Abstract

Two kinds of microstructure, namely the microbands refined microstructure and the martensite-ferrite two phase microstructure, were obtained for a low Cr alloy steel by using different rolling technologies, then the fracture behavior of the steel under different tensile conditions was investigated. Analysis of the strain-stress curves and the microstructures after deformation show that the increase of rolling temperature and the decrease of strain rate could reduce the tensile strength, meanwhile, the enhancing recrystallization process can release the constraint of interior slip systems on the motion of subboundaries. Abnormal increase of tensile strength at 650℃ for the two phase microstructure can be attributed to the numerous precipitation of M₇C₃ in the ferritic matrix, which balances the mechanical properties between ferrite and annealed martensite, therefore improves the tensile strength at 650℃.

Key words: metallic materials precipitation strengthening high temperature tension microbands

Received: 02 September 2019

ZTFLH:

TG335.11

Fund: National Natural Science Foundation of China(51274036);China Postdoctoral Science Foundation(2019TQ0028)

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	Lei CHENG
	Wei YU
	Qingwu CAI

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.428 OR https://www.cjmr.org/EN/Y2020/V34/I1/21

Table 1 Chemical compositions of the low Cr alloy steel (mass fraction,%)

Fig.1 Rolling strategies of process 1 and process 2 are listed in (a) and (b), respectively. Shape of the tensile specimen is presented in (c) (unit: mm)

Fig.2 SEM images of the microbands refined ferritic microstructure and the two phase microstructure are presented in (a) and (b), respectively; corresponding EBSD maps are showed in (c) and (d), respectively

Fig.3 Tensile curves of the two kinds of microstructures under different conditions are presented in (a) and (b), related work hardening rates are plotted in (c) and (d), respectively

Fig.4 Fracture morphologies of the microbands refined microstructure and the two phase microstructure under different tensile temperatures are presented in (a~d); typical textures in bcc structure, along with the original textures of the two microstructures are showed in (e)

Fig.5 Deformed characteristics of the microbands refined microstructure (a, c, e, g) and two phase microstructure (b, d, f, h) after tensioning at different conditions, and the scanning regions are 1 mm from the fracture margins

Fig.6 Inverse pole figure (IPF) of the two phase microstructure that deformed at 550℃ is presented in (a), and the electronic polished surface is showed in (b). After tension at 550℃ and 650℃, precipitation statuses of the ferritic grains in the two phase microstructure are presented in (c) and (d), respectively. EDS results of the typical precipitates are listed in (e)

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