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通过电化学充氢、慢速率拉伸试验,研究了合金元素钨对贝氏体钢的常规力学性能及氢脆敏感性的影响,并运用扫描电镜(SEM)方法研究了含钨和含钼两种钢氢脆敏感性不同的原因。结果表明,含钨钢的强度及塑性略优于含钼钢,而冲击韧性明显优于含钼钢;含钨钢的氢脆敏感性明显低于含钼钢;含钨钢的氢脆断口为韧性断口,而含钼钢的断口为解理断口;含钨钢的细晶粒组织是氢脆敏感性低的一个重要原因。
The effects of alloying elemental tungsten on the regular mechanical properties and hydrogen embrittlement susceptibility of bainitic steels were investigated by means of electrochemical hydrogen charging and slow rate tensile tests. The effects of tungsten and molybdenum containing molybdenum were investigated by scanning electron microscopy (SEM) Two kinds of hydrogen embrittlement sensitivity of different reasons. The results show that the strength and plasticity of the tungsten-containing steel is slightly better than that of the molybdenum-containing steel, while the impact toughness is obviously better than the molybdenum-containing steel. The hydrogen embrittlement sensitivity of the tungsten-containing steel is obviously lower than that of the molybdenum-containing steel. Ductile fracture, while fracture of molybdenum-containing steel is cleavage fracture. The fine grain structure of tungsten-containing steel is an important reason for the low susceptibility of hydrogen embrittlement.