Optimizing δ-ferrite structure to enhance high-temperature elongation in ER308L stainless steel deposited metal

• Autorzy: Jiang Cong , Qi Yanchang , Xu Zixin , Yang Guangchang , Ma Chengyong

Identyfikatory

DOI

10.2478/msp-2025-0018

• Języki publikacji: EN

Abstrakty

EN

As the size and weight of crucial equipment in third-generation nuclear power plants increase, the demand for high-temperature plasticity in welds has become more critical. This study examines the effect of varying δ-ferrite content on the high-temperature tensile properties of 308L austenitic stainless steel deposited metal at 350°C. The results reveal that as the δ-ferrite content decreased from 11.6 to 7.4%, the ferrite morphology shifted from continuous lathy and network structures to a discontinuous skeletal form. Correspondingly, 350°C high-temperature elongation increased from 26 to 32%, while tensile strength remained stable across all specimens, exhibiting good strength and plasticity at room temperature. The discontinuous skeletal δ-ferrite (7.4%) suppresses interfacial crack propagation during high-temperature tensile testing, thereby improving the high-temperature ductility.

Słowa kluczowe

EN

high-temperature elongation; 308L stainless steel; microstructure; welding

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2025
• Tom: Vol. 43, No. 2
• Strony: 52--62
• Opis fizyczny: Bibliogr. 31 poz, rys., tab.

Twórcy

autor

Jiang Cong

• CISRI Welding Institute, Central Iron and Steel Research Institute, Beijing 10081, China

autor

Qi Yanchang

• CISRI Welding Institute, Central Iron and Steel Research Institute, Beijing 10081, China

autor

Xu Zixin

• CISRI Welding Institute, Central Iron and Steel Research Institute, Beijing 10081, China

autor

Yang Guangchang

• CISRI Welding Institute, Central Iron and Steel Research Institute, Beijing 10081, China

autor

Ma Chengyong

• CISRI Welding Institute, Central Iron and Steel Research Institute, Beijing 10081, China

Bibliografia

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