25-27 April 2022
Conventum Conference Center
Europe/Vienna timezone

Research on thermal stability and impact toughness of a new austenitic steel

26 Apr 2022, 11:20
20m
Room 2

Room 2

Oral Presentation Microstructure, properties & performance Microstructure, Properties & Performance

Speaker

Zhixiong Bai (Shanghai University)

Description

The thermal stability and impact toughness of SDHA steel at different temperatures were investigated by hardness measurements and Charpy impact tests. After solid solution, undissolved VC carbides were found in SDHA steel. Besides, when solid solution temperature surpassed 1200 °C, the austenite grains began to grow. The carbide type of SDHA was VC carbide by solid solution and aging. According to test results, the hardness of SDHA steel decreased by 1.1 HRC at 730 °C after 24h. From transmission electron microscopy (TEM) observations, the atomic arrangements of VC carbide and austenite have the same orientation that effectively prevents VC carbides growth. With increase of holding time at 730 °C, SDHA steel precipitated M23C6 carbides at grain boundaries. From 20 °C-700 °C, the fracture types of SDHA steel were intergranular fractures and transgranular fractures. As the temperature increases, more serious plastic deformation appeared in the microstructure near the fracture zone.
Keywords: carbide; temperature; impact toughness; fracture

Speaker Country China

Primary authors

Zhixiong Bai (Shanghai University) Ning Su (Shanghai University) Xiaochun Wu (Shanghai University) Hang Yang (Shanghai University)

Presentation Materials

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