An investigation on high temperature fatigue properties of tempered nuclear-grade deposited weld metals

作者：Cao, X. Y.; Zhu, P.; Yong, Q.; Liu, T. G.; Lu, Y. H.^*; Zhao, J. C.; Jiang, Y.; Shoji, T.

来源：Journal of Nuclear Materials, 2018, 499: 317-325.

DOI：10.1016/j.jnucmat.2017.12.002

• Deposited weld metal
• Tempering
• High temperature
• Low cycle fatigue

Effect of tempering on low cycle fatigue (LCF) behaviors of nuclear-grade deposited weld metal was investigated, and The LCF tests were performed at 350 degrees C with strain amplitudes ranging from 0.2% to 0.6%. The results showed that at a low strain amplitude, deposited weld metal tempered for 1 h had a high fatigue resistance due to high yield strength, while at a high strain amplitude, the one tempered for 24 h had a superior fatigue resistance due to high ductility. Deposited weld metal tempered for 1 h exhibited cyclic hardening at the tested strain amplitudes. Deposited weld metal tempered for 24 h exhibited cyclic hardening at a low strain amplitude but cyclic softening at a high strain amplitude. Existence and decomposition of martensite-austenite (M-A) islands as well as dislocations activities contributed to fatigue property discrepancy among the two tempered deposited weld metal.

• 出版日期2018-2
• 单位北京科技大学