scholarly journals Second Annual Progress Report on Correlation Between Microstructure and Mechanical Properties of Neutron-Irradiated Ferritic-Martensitic and Austenitic Steels

2020 ◽  
Author(s):  
Weicheng Zhong ◽  
Lizhen Tan
Keyword(s):  
Mechanical Properties ◽  
Progress Report ◽  
Austenitic Steels ◽  
Microstructure And Mechanical Properties ◽  
Annual Progress Report

Microstructure and mechanical properties of the Sanicro 25 steel after ageing

2018 ◽  
Vol 1 (91) ◽  
pp. 5-11
Author(s):  
A. Merda ◽  
M. Sroka ◽  
K. Klimaszewska ◽  
G. Golański
Keyword(s):  
Mechanical Properties ◽  
Grain Boundaries ◽  
Hardness Measurement ◽  
Austenitic Steels ◽  
Precipitate Morphology ◽  
Microstructural Investigation ◽  
Σ Phase ◽  
Steel Microstructure ◽  
Microstructure And Mechanical Properties ◽  
Secondary Precipitates

Purpose: The purpose of the research was to determine and analyse the changes in the microstructure and mechanical properties of the Sanicro 25 steel in the as-received condition and after ageing at 600, 650 and 700°C for up to 10,000 hours. Design/methodology/approach: The scope of the investigations included: microstructural investigation – SEM microscopy, analysis of precipitation performed using TEM microscopy, investigation of mechanical properties, Vickers hardness measurement. Findings: In the as-received condition, the Sanicro 25 steel was characterised by austenitic microstructure with annealing twins and numerous primary precipitates. The analysis of Sanicro 25 steel microstructure after ageing at 600 and 700°C for up to 10,000 hours revealed significant changes in the microstructure consisting mainly in a tendency to create unfavourable morphology of secondary precipitates – M23C6 carbides that form continuous carbide systems along the grain boundaries. The observations have shown that during long-term ageing the secondary carbides were also precipitated inside the grains and at the interface of three grain boundaries – σ phase. Research limitations/implications: The analysis of the microstructure of the examined steel using SEM and TEM was performed to determine the influence of ageing on the processes of changes in the precipitate morphology. Practical implications: The results obtained based on the performed research constitute a building block for the degradation characteristics of the microstructure and mechanical properties of the 23/25-type austenitic steels. Originality/value: The results of the investigation and analysis of the metallographic and mechanical properties of the Sanicro25 austenitic steel in as-received condition and after ageing are presented.

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