Impact Factor:6.4
DOI number:10.1016/j.msea.2018.11.131
Affiliation of Author(s):中国科学院金属研究所
Teaching and Research Group:0
Journal:Materials Science and Engineering: A
Place of Publication:荷兰
Funded by:核材料研究与开发与服役安全保障技术，国家自然科学基金
Key Words:310s austenitic weld metals; Deformation twins; Nb(C, N); Temperature dependence; Plasticity
Abstract:The deformation behaviors of 310s stainless steel weld metals (WMs) with different Nb contents are investigated under uniaxial tension at temperatures ranging from ambient temperature to 1000°C. The results show that Nb effectively improves the strength of the WMs in the whole test temperatures range. The addition of Nb causes a change in the fractures of the WMs from intergranular brittle fractures to intragranular ductile fractures at elevated temperature. Hence, elemental Nb enhances the elevated temperature plasticity of the WMs. However, as the eutectic Nb(C, N) promotes the nucleation and propagation of the cracks, Nb decreases the elongation of the WMs at temperature below 700°C. With the increase in the deformation temperature, the strength of the WMs decreases monotonously. However, the elongation of the WMs shows a nonmonotonic relationship with the temperatures. The deformation twins can occur at room temperature and improve the strength and elongation of the WMs. Meanwhile, the cracks nucleate around the eutectic Nb(C, N) at 1000°C, leading to the minimum elongation of the Nb-bearing WMs in the whole test temperature range. The differential scanning calorimetry result suggests that the melting of the eutectic Nb(C, N) may be the dominant reason for the nucleation of the cracks and result in the reduction in the elongation of the Nb-bearing WM at 1000°C.
Note:0
First Author:zhangxu
Indexed by:研究论文
Document Code:1
Discipline:Engineering
First-Level Discipline:Materials Science and Engineering
Volume:743
Issue:0
Page Number:648-655
ISSN No.:0921-5093
Translation or Not:no
CN No.:0
Date of Publication:2018-01-01