Crack Propagation of Weld Joint for Steel 316LN by Impact Loading

doi:10.11901/1005.3093.2016.742

Chinese Journal of Materials Research

2017, Vol. 31

Issue (12): 939-946 DOI: 10.11901/1005.3093.2016.742

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Crack Propagation of Weld Joint for Steel 316LN by Impact Loading

Keshun DAI, Li ZHU, Han WANG, Wenkai XIAO(

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School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China

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Keshun DAI, Li ZHU, Han WANG, Wenkai XIAO. Crack Propagation of Weld Joint for Steel 316LN by Impact Loading. Chinese Journal of Materials Research, 2017, 31(12): 939-946.

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Abstract

The fracture behavior of weld join of steel 316LN by impact test was investigated in terms of macro and micro perspectives, while a numerical model based on cohesive finite element method (CFEM) was presented to describe the effect of microstructure on the fracture behavior of the weld joint of steel 316LN. Based on microstructure images acquired from the experiments, three types of typical microstructure such as equiaxial-, columnar- and dendritic sub-grains were numerically modeled. The crack propagation paths in the three types of microstructure were simulated, and which then were compared with the experimental results. It follows that the observed fracture behavior can be interpreted quite well by the prediction of the simulation.

Key words: metallic materials crack propagation cohesive finite element method sub-grains

Received: 20 December 2016

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	Keshun DAI
	Li ZHU
	Han WANG
	Wenkai XIAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.742 OR https://www.cjmr.org/EN/Y2017/V31/I12/939

Fig.1 Cast microstructures of 316LN weldment (a) and microstructure of equiaxial sub-grains in region I (b), columnar sub-grains in region II (c), and dendritic sub-grains in region III (d)

Fig.2 Charpy V impact test model

Fig.3 Bilinear cohesive law

Fig.4 Sub-grain model of equiaxed sub-grain model (a), columnar sub-grain model (b) and dendritic sub-grain model (c)

Fig.5 Nanoidentation load-depth curves

	σ₀ /10⁶ Pa	α /10⁶ Pa	β	$ε ˙ 0$	n	Density, ρ /kgm^-3	E /10⁹ Pa	ν	T_m /10⁶ Pa	W_c /10^-6 m	G_F /10³ Jm^-2
Sub-grain zone	325	1854	0.01262	0.1	0.42	7900	173.3	0.28	1480	10	14.8
Sub-grainboundary	455	2120	0.01262	0.1	0.35	7900	206.8	0.28	1800	6	10.8

Table 1 Mechanical property parameters of weldment

Fig.6 Actual extension path of crack in equiaxial-(a), columnar-(c) and dendritic sub-grains (e); simulative extension path of crack in equiaxial-(b), columnar-(d) and dendritic sub-grains (f)

Fig.7 Microvoids nucleation occurred (a), coalesced (b) and extended (c) in simulated columnar sub-grains, (d) microvoids nucleation occurred and coalesced in real columnar sub-gains

Fig.8 SEM images of impact fracture in columnar (a) and equiaxial (b) sub-grains area

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