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研究了添加微量钙0.006%对新型高强高韧空冷无碳化物贝氏体/马氏体钢25Mn2SiCrCa组织和性能的影响。结果表明,微量钙的加入不会改变实验钢的无碳化物贝氏体/马氏体组织,且对钢的强度、硬度和冲击韧性影响不大。但是,经340℃以下中低温回火后0.006%钙的加入显著降低钢的氢脆敏感性,提高钢的抗延迟断裂性能。微钙钢25Mn2SiCrCa经280℃回火后,氢脆敏感性指数由不含钙钢25Mn2SiCr的53%降至27%,经340℃回火后,氢脆敏感性指数从25Mn2SiCr的48%降至17%。
The effect of adding 0.006% trace calcium on microstructure and properties of a new type of high strength and toughness air-cooled carbide-free bainite / martensitic steel 25Mn2SiCrCa was studied. The results show that the addition of trace calcium does not change the bainite / martensite without carbides, and has little effect on the strength, hardness and impact toughness of the steel. However, the addition of 0.006% Ca after tempering at low temperature below 340 ℃ significantly reduces the hydrogen embrittlement susceptibility of steel and improves the anti-delayed fracture resistance of the steel. After annealing at 280 ℃ for 25Mn2SiCrCa, the sensitivity index of hydrogen embrittlement decreased from 53% of 25Mn2SiCr containing no calcium to 27%. After tempering at 340 ℃, the sensitivity index of hydrogen embrittlement dropped from 48% of 25Mn2SiCr to 17 %.