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Experimental study of mechanical properties and fracture modes in different regions of the nickel-based welding joint based on small punch test

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Abstract

The mechanical properties and fracture mechanism in different micro-regions of the nickel-based welding joint with the ENiCrMo-3 as the electrode and 15CrMoR as the base material are studied based on small punch test (SPT) and microscopic observation. The load–displacement curves in different regions containing base metal zone (BMZ), heat-affected zone (HAZ) and welding metal zone (WMZ) are obtained by SPT, and the distribution laws of yield load Py, the maximum load Pm, the displacement corresponding to the maximum load um and the fracture energy ESP are analysed. The yield load Py and the maximum load Pm in BMZ and HAZ are similar, and both are lower than those in WMZ, while the displacement corresponding to the maximum load and the fracture energy in BMZ and HAZ are similar and larger than those in WMZ. Therefore, the WMZ is with better strength, but weaker ductility than BMZ and HAZ. The fractured SPT specimens and the metallographic observations reveal that the failure mode in BMZ is the significant circular necking forming a “C” type ductile fracture. But in WMZ, the secondary cracks combined with the primary circular crack form a “Y” type fracture morphology with the mixed brittle and ductile fracture mode. In this study, the characterizations of mechanical properties and fracture modes in different micro-regions of nickel-based welding joint are achieved by SPT, which is meaningful to comprehensively understand the fracture behaviour of the nickel-based welding joint.

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Data Availability

The date underlying this article will be shared on reasonable request to the corresponding author.

Abbreviations

P y :

Yield load (N)

P m :

Maximum load (N)

f A :

The load corresponding to point A (N)

f B :

The load corresponding to point B (N)

u m :

The displacement corresponding to the maximum load (mm)

u A :

The displacement value corresponding to point A (mm)

u B :

The displacement value corresponding to the specimen thickness (mm)

E SP :

Fracture energy (MJ)

E SPm :

The fracture energy corresponding to the maximum load of the load–displacement curve (MJ)

E SPw :

The fracture energy corresponding to the entire load–displacement curve (MJ)

P y_Mao :

Yield load derived by the method of Mao (N)

P y_CEN :

Yield load derived by the method in CEN (N)

P y_inf :

Force corresponding to the first inflexion point in SPT curves (N)

P y_t/10 :

Yield load obtained by translating the tangent line of the elastic phase curve to the right by 1/10 of the thickness of the specimen t (N)

σ y :

Yield stress (MPa)

σ y_Mao :

Yield stress in the correlation equation proposed by Mao (MPa)

σ y_Cue :

Yield stress in the correlation equation proposed by Cue (MPa)

t :

Small punch test specimen thickness (mm)

α :

Empirical fitting parameter

α 1 :

Slope

α 2 :

Intercept

D :

Lower die punching diameter (mm)

d :

Upper die punching diameter (mm)

t h1 :

The minimum thickness of the specimen in BMZ (mm)

t h2 :

The minimum thickness of the specimen in WMZ (mm)

SPT:

Small punch test

SMAW:

Shielded metal arc welding

PWHT:

Post-weld heat treatment

BMZ:

Base metal zone

HAZ:

Heat-affected zone

WMZ:

Welding metal zone

TIG:

Tungsten inert gas

A-TIG:

Activating flux TIG welding

DIC:

Digital image correlation

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Funding

This work received supports from the National Natural Science Foundation of China, grant number 52075050; Natural Science Foundation of Jiangsu Province, grant number BK20201448; and Postgraduate Research & Practice Innovation Program of Jiangsu Province, grant number, SJCX22_1427.

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Authors and Affiliations

  1. School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou, 213164, People’s Republic of China

    Xiangxuan Geng, Jian Peng, Xuedong Liu, Yi Tu & Zhichao Xue

  2. Jiangsu Province Engineering Research Center of High-Level Energy and Power Equipment, Changzhou, 213164, China

    Jian Peng & Xuedong Liu

  3. Sinopec Yangzi Petrochemical Co. Ltd, Nanjing, 210048, China

    Liangxiong Jiang

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  1. Xiangxuan Geng
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Geng, X., Peng, J., Jiang, L. et al. Experimental study of mechanical properties and fracture modes in different regions of the nickel-based welding joint based on small punch test. Weld World 67, 637–650 (2023). https://doi.org/10.1007/s40194-022-01451-w

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