Hydrogen-assisted cracking of T-250 maraging steel
Hydrogen-assisted cracking of T-250 maraging steel
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DOI：
10.1016/j.msea.2007.02.111
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发表时间：
2007-12
期刊：
影响因子：
6.4
通讯作者：
Y. Zhang;D. Shi;W. Chu;L. Qiao;Y. Shi;S. Zheng;S. Wang
中科院分区：
文献类型：
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作者：
Y. Zhang;D. Shi;W. Chu;L. Qiao;Y. Shi;S. Zheng;S. Wang
研究了T-250马氏体时效钢的氢助开裂。结果表明，当空气相对湿度≥ 30%时，可发生HAC。抑制阈值应力强度因子KIH（MPam ~（1/2））随试样在湿空气中或溶液中充氢时进入试样的氢浓度C（ppm）的对数的增加而线性减小，即KIH=49.5-26.1lnC。在相对湿度为82%的湿空气中，随着缺口半径ρ的平方根的增大，缺口尖端裂纹萌生的门槛应力强度因子KIH（ρ）增大，当ρ>ρ0= 0.08 mm时，即KIH（ρ>0.08 mm）=−32.7+244.9ρ，而当ρ≤ρ0时，KIH（ρ≤ 0.08 mm）=KIH=37.5MPam1/2。
Hydrogen-assisted cracking (HAC) of T-250 maraging steel has been studied. The results showed that HAC could occur in air when the relative humidity (RH) was ≥30%. The arrested threshold stress intensity factor, KIH(MPam1/2), decreases linearly with increasing the logarithm of hydrogen concentration entered into the samples during putting in humid air or charging in the solution, C (ppm), i.e. KIH=49.5–26.1lnC. The threshold stress intensity factor for the crack initiating from notch tip in humid air with RH=82%, KIH(ρ), increases with increasing the square root of notch radius ρ, as ρ>ρ0=0.08mm, i.e. KIH(ρ>0.08 mm)=−32.7+244.9ρ, however, when ρ≤ρ0, KIH(ρ≤ 0.08mm)=KIH=37.5MPam1/2.