钨对贝氏体钢力学性能及氢脆敏感性的影响

Effect of tungsten on properties and susceptibility to hydrogen embrittlement of bainitic steel

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。

Effect of tungsten on properties and susceptibility to hydrogen embrittlement of bainitic steel were investigated using electrochemical hydrogenation and slow strain rate test.The reasons of different susceptibility to hydrogen embrittlement for w-containing steel and Mo-containing steel were studied by scanning electron microscope (SEM).The results show that strength and plastic properties of W-containing steel are slightly better than that of Mo-containing steel,while impact toughness is obviously better than that of the Mocontaining steel,and susceptibility to hydrogen embrittlement of the W-containing steel is significantly lower than that of the Mo-containing steel.Ductile fracture is occurred on the W-containing H-riched steel,and cleavage fracture is observed on the Mo-containing H-riched steel.Fine microstructure of the W-containing steel is a major cause of low susceptibility to hydrogen embrittlement.