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本文采用三点弯曲试验对低合金高强钢氢致裂纹及氢致脆化的敏感性进行了研究,用脆化度I_COD=(δ_cr-δ_crH)/δ_cr作为氢致脆化的判据。高强钢三点弯曲试样的断口形态受应力强度因子K和氢量H的影响,随着K值增加和氢量减少,断口形态由I G→QC_(HE)→DR过渡。根据本研究工作的试验条件,用声发射(AE)捕捉启裂点和监视裂纹的扩展是可行的。
In this paper, the three-point bending test was used to study the hydrogen induced cracking and hydrogen embrittlement in low alloyed high strength steel. The embrittlement degree I_COD = (δ_cr-δ_crH) / δ_cr was used as the criterion for hydrogen embrittlement. The fracture morphology of the high-strength steel three-point bending specimen is affected by the stress intensity factor K and hydrogen content H, and the fracture morphology transitions from I G → QC_ (HE) → DR as the K value increases and the hydrogen content decreases. According to the experimental conditions of this study, it is feasible to capture the crack initiation point and monitor the propagation of cracks by acoustic emission (AE).