首页|Cause analysis and optimization suggestions for low-impact energy in stainless steel 316LN at ultralow temperatures
Cause analysis and optimization suggestions for low-impact energy in stainless steel 316LN at ultralow temperatures
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The detailed reasons for the low impact energy of stainless steel 316LN were investigated through optical microscopy,EDS,and EBSD techniques.The results indicated that the massive σ phase with brittle properties precipitated in the center layer of 316LN was the main cause of the relatively low impact energy observed in the experiment.According to calculations using Thermo-Calc software,the σ phase in the center layer precipitated from the δ ferrite following prolonged hot deformation and annealing at 700-950 ℃.However,the δ ferrite and σ phase could be eliminated through proper thermo-mechanical treatments,which would improve the impact properties at ultralow temperatures.
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