Influence of precipitated phases on properties during prolonged aging in TP347H steel at 700 degrees C

Wang W.; Wang Z. W.; Li W. S.; Tian J.; Zhong W. L.; Lin J. D.

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Influence of precipitated phases on properties during prolonged aging in TP347H steel at 700 degrees C

机译：沉淀阶段对700℃的TP347H钢延长衰老性能的影响

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The aging of austenitic stainless steel TP347H (18% Cr-12% Ni-1% Nb) was performed at 700 degrees C for 500, 800, 1500, 2500 and 3650h. Microstructure, precipitates and mechanical properties were examined on aged materials to analyze the impact of microstructure on mechanical properties. These tests showed that the main precipitate of the TP347 specimen was Nb(C,N) while M23C6 carbides precipitated at the aging time of 500h, with the coarsening of M23C6 and MX phases during prolonged aging. The fine and dispersive Nb(C,N) particle precipitation up to 1500h aging is a benefit for hardness and creep resistance. After aging for 3650h, sigma phase precipitated. Meanwhile, coarsening of Cr23C6 and Nb(C,N) led to creep cavity and brittle intergranular fracture. No clear change in tensile properties at room temperature during aging were observed. A distinct decline in creep properties was caused by an average diameter increase and precipitation of sigma phase and bulky Cr23C6.

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《Materials at High Temperatures》 |2017年第3期|共8页
作者
Wang W.; Wang Z. W.; Li W. S.; Tian J.; Zhong W. L.; Lin J. D.;
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作者单位

Guangdong Power Grid Co Ltd Elect Power Res Inst Guangzhou Guangdong Peoples R China;

Wuhan Univ Sch Power &

Engn Wuhan Peoples R China;

Guangdong Power Grid Co Ltd Elect Power Res Inst Guangzhou Guangdong Peoples R China;

Wuhan Univ Sch Power &

Engn Wuhan Peoples R China;

Guangdong Power Grid Co Ltd Elect Power Res Inst Guangzhou Guangdong Peoples R China;

Guangdong Power Grid Co Ltd Elect Power Res Inst Guangzhou Guangdong Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类工程材料学;
关键词
TP347H steel; precipitated phases; aging; creep resistance; sigma phase;

机译：TP347H钢;沉淀阶段;老化;抗蠕变;σ相;

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Influence of precipitated phases on properties during prolonged aging in TP347H steel at 700 degrees C

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