Microstructure of Welding Seam and its Effect on Propagation of Microcracks in Nulear Gade Z3CN20-09M Sainless Seel

doi:10.11901/1005.3093.2014.220

Chinese Journal of Materials Research

2014, Vol. 28

Issue (11): 809-813 DOI: 10.11901/1005.3093.2014.220

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Microstructure of Welding Seam and its Effect on Propagation of Microcracks in Nulear Gade Z3CN20-09M Sainless Seel

Wei WANG,Kuilin LUO,Yonghao LU(

)

School of National Center for Materials Service Safety, University of Science and Technology Beijing 100083

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Wei WANG,Kuilin LUO,Yonghao LU. Microstructure of Welding Seam and its Effect on Propagation of Microcracks in Nulear Gade Z3CN20-09M Sainless Seel. Chinese Journal of Materials Research, 2014, 28(11): 809-813.

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Abstract

The microstructure of welding seam was characterized by optical microscope and SEM, and then of which the effect on crack propagation was studied by means of situ tensile test in SEM and EBSD technique for a nuclear grade stainless Z3CN20-09M. The results show that the weld seam composes of lath-shaped and island-like microstructures and different microstructures exhibited different resistance to crack propagation. Island-like microstructure has a strong resistance to the crack propagation, which can induce a deflection of the path way of crack propagation; while lath-shaped structure showed little effect on crack propagation, and the crack passed though the lath-shaped microstructure quickly without any deflection.

Key words: metallic materials nuclear grade stainless steel welding seam microstructure crack

Received: 28 April 2014

Fund:

*Supported by National Science and Technology Major Project 2011ZX06004-009.

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	Wei WANG
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	Yonghao LU

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.220 OR https://www.cjmr.org/EN/Y2014/V28/I11/809

Table 1 Chemical component of Z3CN20-09M (%, mass fraction)

Fig.1 Simulation picture of situ tensile tests sample

Fig.2 Optical micrographs of weld seam

Fig.3 Microstructure relationship between δ and γ phase in island-like and lath-like structures (a) and (b) is the pore figure of ferrite and austenite in island-like structures; (c) and (d) is the pore figure of ferrite and austenite in lath-like structures

Fig.4 EBSD analyse of microstructures in weld seam (a) SEM of weld seam; (b) Distribution graph of high-angle boundary; (c) Distribution graph of twin crystal boundary and phase boundary; (d) Distribution graph of inner stress

Fig.5 Crack progation in weld microstructures at different stage

Fig.6 Fracture morphologies of specimens in weld joint

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