用光学显微镜,扫描电镜和X射线衍射仪研究了稳定的奥氏体不锈钢的氢脆现象。结果表明:1.阴极充氢能引起试样表面γ→ε转变,并有新的f_(cc)相的出现。2.充氢可使试样表面形成裂纹。3.拉伸试样表面充氢层的断口是穿晶解理断口。断口中的二次裂纹是沿着滑移线的。 上述结果证明:α′马氏体转变对于奥氏体钢的氢脆并不是必要的条件。稳定的奥氏体不锈钢中也会发生氢脆现象。
Hydrogen embrittlement of stable austenitic stainless steel Cr20Ni25 has been investigated. Crack formation and phase transformation on the surface of the specimens have been observed. It is shown that electrolytic hydrogen charging promotes the transformation of e-martensite on the surface of specimens, the formation of surface crack and the formation of new fcc phase. Transgranular cleavage fracture is shown for the charged layer in tensile specimen. The crack propagates along slip face.The present study suggests that stable austenitic stainless steel is also subject to hydrogen embrittlemt. The transformation of α′-martensite may be not necessary for hydrogen embrittlement of austenitie stainless steel.
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