摘要
氢是造成钢铁材料失效的重要因素之一。本文通过对C56E2钢的微观缺陷观察、充氢实验和缺陷统计,结果表明,C56E2钢中氢可以导致夹杂物/基体界面出现脱粘现象,并在后续遗传至最终材料,淬火、回火热处理无法改善该微观缺陷。夹杂物平均脱粘率(AIDR)随着氢的等效扩散距离增加呈下降趋势,相关性较强,下降斜率与充氢时间无统一的规律性。AIDR与充氢时间无明显规律关系,AIDR总体随第一峰氢、第二峰氢和总氢含量的增加呈上升趋势,相关性较弱。充氢过程中氢沿着浓度下降的方向扩散,充氢实验时间(≤216 h)远远未达到氢完全形成破坏所需时间,氢含量在远端尚未达到最大值,且尚未充分转化并形成破坏。
Hydrogen(H)is one of the important factors which causing the failure of steel materials.In this paper microscopic defect observation,hydrogen charging experiment and defect statistics of C56E2 steel were studied,the results show that H in C56E2 steel can cause inclusion/matrix interface cavity,which could be inherited to the final material,heat treatment including quenching,tempering,could not improve those micro-defects.The average inclusion/matrix interface debonding ratio(AIDR)decreased with increased the equivalent diffusion distance of hydrogen,the correlation is strong and without any uniform rule between the descending slope and H charging time.There was not any obviously rule between AIDR and H charging time,the AIDR is increasing with the increase of the first and second peak periods and the total hydrogen content,and the correlation is weak.In the process of hydrogen charging,H diffused in the direction of H concentration decreased,the H charging time(≤216 h)applied in this paper was far from the time which required for the effect of H breaking to the steel.H in the deep inner of the sample was much lower than the max which could be reach,and transformed and broken to the steel incompletely.
作者
陈德
刘吉刚
周阳
Chen De;Liu Jigang;Zhou Yang(Special Steel Making Unit,Jiangyin Xingcheng Special Steel Works Co.,Ltd.,Jiangyin 214400,China;R&D Institute,Jiangyin Xingcheng Special Steel Works Co.,Ltd.,Jiangyin 214400,China)
出处
《特殊钢》
2023年第6期117-122,共6页
Special Steel
关键词
中碳轴承钢
夹杂物
充氢
微观缺陷
Middle Carbon Bearing Steel
Inclusion
H Charging
Micro-defect
