Relationship between Laves phase and the impact brittleness of P92 steel reevaluated

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:639

Article

Zhong, Wanli¹  Yang, Xu²  Li, Wensheng¹  Yan, Wei³  Sha, Wei⁴  Wang, Wei^1,3  Shan, Yiyin³  Yang, Ke³ 

[1] Guangdong Power Grid Co Ltd, Elect Power Res Inst, Guangzhou 510080, Guangdong, Peoples R China

[2] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[4] Queens Univ Belfast, Sch Planning Architecture & Civil Engn, Belfast BT9 5AG, Antrim, North Ireland

关键词: Steel;    Precipitation;    Fracture;    Mechanical characterization;    Electron microscopy;    Phase transformation;   

DOI  :  10.1016/j.msea.2015.05.012

来源: Elsevier

【 摘 要 】

Laves phase has been widely accepted to cause the impact brittleness of 9-12Cr martensitic heat-resistant steels after long time aging at elevated temperatures. However, in the present research, the impact toughness of the already brittle P92 steel aged at 600 degrees C for 2035 h could be restored to the original level by reheating at 700 degrees C for 1 h, with Laves phase barely changed. This interesting result strongly indicated that the presence of Laves phase might not be the real reason for the impact brittleness. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free