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本文研究了亚温(α+γ)区域淬火对高强钢30CrMnSiA 氢致延迟断裂的影响。结果表明,在900℃油淬和250℃回火之间增加一次自860℃(α+γ)区的亚温淬火能显著提高该钢的抗氢脆能力。可提高回火马氏体的氢致延迟断裂的下临界应力,降低裂纹扩展速率,而对回火索氏体组织影响不大。离子探针和 X-射线能谱分析发现亚温淬火在不同程度上消除了合金元素和杂质元素在奥氏体晶界上的偏聚;微量铁素体的存在,以及奥氏体晶粒细化都对改善钢的氢致延迟断裂抗力起着有益的作用。
This paper studies the effect of sub-temperature (α + γ) quenching on hydrogen induced delayed fracture of high strength steel 30CrMnSiA. The results show that adding a sub-temperature quench from 860 ℃ (α + γ) to quenching at 900 ℃ and tempering at 250 ℃ can significantly improve the hydrogen embrittlement resistance of the steel. Can increase the lower critical stress of hydrogen induced delayed tempering of tempered martensite, reduce the crack propagation rate, and has little effect on the tempered sorbite structure. Ion probe and X-ray energy spectrum analysis show that sub-temperature quenching can eliminate segregation of alloying elements and impurity elements on the austenite grain boundaries to some extent. The existence of trace ferrite and austenite grain refinement Both play a beneficial role in improving the hydrogen-induced delayed fracture resistance of steel.