Microstructure and low temperature toughness of HAZ of domestic 06Ni9DR steel

被引：0
|
作者：
Li L. [1 ]
Wang X. [1 ]
Liu Z. [2 ]
Zhou C. [1 ]
Han B. [1 ]
机构：
[1] School of Materials Science and Engineering, China University of Petroleum, Qingdao
[2] PetroChina (Xinjiang) Petroleum Engineering Co., Ltd., Kelamayi
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2020年 / 41卷 / 07期
关键词：
06Ni9DR steel; Heat-affected zone; Low temperature toughness; Microstructure; Thermal simulation;
D O I：
10.12073/j.hjxb.20200202002
中图分类号：
学科分类号：
摘要：
Effects of peak temperatures in a single thermal cycle on the microstructure and low-temperature impact toughness of heat-affected zone (HAZ) of the domestic 06Ni9DR steel were investigated by using scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). The results show that the impact energy at −196 ℃ of the HAZ of the 06Ni9DR steel is lower than that of the base metal. The coarse-grained HAZ (CGHAZ) has the lowest impact energy. The reasons for CGHAZ embrittlement lie in the coarse original austenite grains, less resulting effective large-angle grain boundaries and unstable residual austenite, larger dislocation density, and coarse martensite. The impact energy of subcritical HAZ (SCHAZ) is only higher than that of CGHAZ due to the existence of large block reverses austenite and M-A components with chain-like distribution on the grain boundaries. The toughness of both fine-grained HAZ (FGHAZ) and inter critical HAZ (ICHAZ) is lower than that of the base metal because of the presence of retained austenite with poor low-temperature stability and quenched martensite. Copyright © 2020 Transactions of the China Welding Institution. All rights reserved.
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页码：91 / 96
页数：5
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