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采用TEM和双电解池氢渗透法研究了TM210马氏体时效钢不同时效时间的析出相及其对氢扩散性能的影响。结果表明,马氏体时效钢在465℃下分别时效3 h、60 h和100 h后,都仅生成Ni3Ti析出相,长度分别为约10.4、26.8、36.8 nm,同时析出相线度与时效时间符合关系r珋3=375t。晶体结构为简单六方,点阵常数a=0.5101 nm,c=0.8304 nm。随着时效时间的延长,析出相长大,数量减少,单位体积数量分别为32、9.26和6.23(1022/m3),但体积分数增加。3种时效条件下的氢扩散系数分别为3.34、5.68和6.52(10-9cm2/s)。这些结果表明析出相作为氢陷阱能够影响氢在钢中的扩散,析出相数量越多,氢扩散系数越小。
The precipitation phase of TM210 martensitic steel at different aging time and its effect on hydrogen diffusion were studied by TEM and double cell hydrogen permeation method. The results show that the martensite-aged steels are only aged at 465 ℃ for 3 h, 60 h and 100 h, respectively, and only Ni3Ti precipitates are formed, the lengths are about 10.4, 26.8 and 36.8 nm, respectively. Matching relationship r 珋 3 = 375t. The crystal structure is simple hexagonal with lattice constant a = 0.5101 nm and c = 0.8304 nm. With the extension of the aging time, the precipitates grew up and the number decreased, the unit volume was 32, 9.26 and 6.23 (1022 / m3) respectively, but the volume fraction increased. The hydrogen diffusion coefficients under the three aging conditions were 3.34, 5.68 and 6.52 (10-9 cm2 / s), respectively. These results show that the precipitated phase as a hydrogen trap can affect the hydrogen diffusion in steel. The more the precipitated phase, the smaller the hydrogen diffusion coefficient.