根据氢在铁中的溶解度以及扩散行为,制定了辙叉用贝氏体钢的去氢退火工艺.通过慢应变速率拉伸试验研究了辙叉用贝氏体钢的临界氢含量和氢脆敏感性.研究结果表明,通过去氧退火使试验用钢的组织得到细化,塑性和韧度得到大幅度提高.含W贝氏体钢的氢含量由1.2×10-4%降低到0.5×10-4%,低于该钢发生氢脆的临界氢含量0.7×10-4%.含Mo贝氏体钢氢含量由1.6×10-4%降低到0.4×10-4%,低于此种钢发生氢脆的临界氢含量0.6×10-4%.含W钢比含Mo钢的氢脆敏感性低.
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