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本文研究了用精旋压冷变形成型后经磷化处理的高强钢28Cr_3SiNiMoWVA简体氢致延迟断裂的倾向性。磷化处理使钢中氢含量略有增加,可达2.84ppm,带磷化层时达16ppm,呈现氢致延迟开裂的现象。用片状缺口试样恒载持久拉伸试验测量其氢致延迟开裂的临界应力。实验表明,尽管自磷化简体上切割的试样含氢量较高,其氢致延迟断裂的倾向性却很小。钢的材质及旋压冷变形纤维组织是氢脆不敏感的原因。
In this paper, the propensity of hydrogen induced delayed fracture of high strength steel 28Cr_3SiNiMoWVA after phosphating treatment by intensive spinning cold forming was studied. Phosphating treatment slightly increased the hydrogen content in the steel up to 2.84 ppm with a phosphating layer up to 16 ppm, exhibiting delayed hydrogen cracking. The critical stress of hydrogen induced delayed cracking was measured by the permanent load tensile test of the notched specimen. Experiments show that, although self-phosphating simplified cutting samples with high hydrogen content, hydrogen induced delayed fracture tendency is very small. The material of the steel and the spinning cold deformation of the fiber structure is not sensitive to hydrogen embrittlement.