Weld defects and precipitates of deposited metal in 9Ni steel welded joint

• Autorzy: Ma Chengyong , Qi Yanchang , Zhang Yuqing , Wu Zhiquan , Zhang Xin

Identyfikatory

DOI

10.2478/msp-2022-0007

• Języki publikacji: EN

Abstrakty

EN

Three kinds of electrode with different niobium contents were developed and compared, and the influence of alloying elements on microstructure and mechanical properties was summarized. Strong carbide elements such as Nb, Ti, and V were added to form stable precipitates. The existence of intercrystalline precipitates leads to pinning and zigzag of grain boundaries, hinders the propagation of cracks, and enhances the low temperature strength and impact toughness of the materials. The No. 1 and No. 2 ENiCrMo-6 electrodes meet the requirements of LNG (liquified natural gas) equipment. The tensile strength of the deposited metal reaches 687 MPa, while the average impact energy at −196°C is 131 J. Owing to fluctuations in the stress concentration at the junction of grain boundaries, cracks may easily form. MC carbide can retard the crack propagation. With the increase of Nb and other alloys, the strength and hardness increase gradually, but the plasticity and toughness are retarded to a certain extent.

Słowa kluczowe

EN

deposited metal; 9Ni steel; welded joint; precipitate

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2022
• Tom: Vol. 40, No. 1
• Strony: 25--48
• Opis fizyczny: Bibliogr. 24 poz., rys., tab.

Twórcy

autor

Ma Chengyong

• Welding Research Institute, General Iron and Steel Research Institute, Beijing 100044, China

autor

Qi Yanchang

• Welding Research Institute, General Iron and Steel Research Institute, Beijing 100044, China

autor

Zhang Yuqing

• Welding Research Institute, General Iron and Steel Research Institute, Beijing 100044, China

autor

Wu Zhiquan

• Institute of New Energy Technology, State Power Investment Corporation Research Institute, Beijing 102209, China

autor

Zhang Xin

• Institute of New Energy Technology, State Power Investment Corporation Research Institute, Beijing 102209, China

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