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3h、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r3=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 (10-9 cm2/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.
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