The effects of acid-soluble Al content on the physical and chemical performances of high Al steels were investigated. The results show that the distribution of acid-soluble Al in steel substrate is uniform. With incre...The effects of acid-soluble Al content on the physical and chemical performances of high Al steels were investigated. The results show that the distribution of acid-soluble Al in steel substrate is uniform. With increasing Al content, the strength and toughness of steels decrease a little but the hardness increases. The average yield strength and tensile strength are 425MPa and 570MPa, respectively, and the Rockwell hardness is 89.7. For non-Al steels the average oxidation rate is up to 0.421mg/(cm2·h) at 1373K. For high Al steels, when the mass fraction of Al is less than 5%, there is a thinner gray oxidized layer on surface and the oxidation rate is high; when the mass fraction of Al is more than 8.0%, the thin, close and yellow glossing film still exists, and the average oxidation rate is only 0.016mg/(cm2·h).展开更多
Super-ductile and high strength manganese TWIP steels have received much attention in recent years.In the present work,two high Mn high Al steels with different stacking fault energies were investigated, microstructur...Super-ductile and high strength manganese TWIP steels have received much attention in recent years.In the present work,two high Mn high Al steels with different stacking fault energies were investigated, microstructures were examined and mechanical properties were measured.The results showed that Fe-26Mn-6Al- 1C steel（6Al steel） exhibits high tensile strength and Fe-26Mn-12Al-1C steel（12Al steel） possesses a very high strength.Both steels exhibit good ductility.For 6Al steel with a moderate stacking fault energy（60 mJ/m;）, twinning is the major deformation mechanism;while dislocation slip dominates the deformation process of 12Al steel with stacking fault energy of 90 mJ/m;.展开更多
M2 cast high speed steel was inoculated by addition of rare earth(RE)-Al-N, network eutectic carbides were eliminated, matrix microstructures were refined and the segregation of tungsten and molybdenum elements was re...M2 cast high speed steel was inoculated by addition of rare earth(RE)-Al-N, network eutectic carbides were eliminated, matrix microstructures were refined and the segregation of tungsten and molybdenum elements was relieved. In the condition that the hardness does not decrease, impact toughness obviously increases. Quenching at 1180 ℃ and three-times tempering at 560 ℃, the hardness of M2 cast high speed steel is 65～66 HRC, and impact toughness reaches 21.3 (J·cm^(-2)). Modified M2 cast high speed steel has excellent thermal fatigue resistance and high temperature wear resistance. Roller made in modified M2 cast high speed steel has excellent service effect when it is used in slit rolling mill of hot rolling bar mill.展开更多
研究了合金元素Al对3种不同Al含量的Fe-28Mn-x Al-1C(x=8,10,12)系低密度钢层错能的影响。结果表明,3种实验钢的层错能范围为67.76~90.64 m J/m^2,Al对层错能的影响呈多项式分布。与28Mn-10Al及28Mn-8Al合金相比,28Mn-12Al合金层错能较...研究了合金元素Al对3种不同Al含量的Fe-28Mn-x Al-1C(x=8,10,12)系低密度钢层错能的影响。结果表明,3种实验钢的层错能范围为67.76~90.64 m J/m^2,Al对层错能的影响呈多项式分布。与28Mn-10Al及28Mn-8Al合金相比,28Mn-12Al合金层错能较高,抗拉强度高但伸长率低,在相同变形量下,28Mn-8Al与28Mn-10Al合金均出现了孪晶组织,且28Mn-8Al中孪晶更明显,而28Mn-12Al合金中未发现孪晶。3种合金的变形机制均为平面滑移变形,这归因于Fe-Mn-Al-C系合金中存在的短程有序会导致"滑移面软化现象",使高层错能的28Mn-12Al合金变形机制也为平面滑移。展开更多
文摘The effects of acid-soluble Al content on the physical and chemical performances of high Al steels were investigated. The results show that the distribution of acid-soluble Al in steel substrate is uniform. With increasing Al content, the strength and toughness of steels decrease a little but the hardness increases. The average yield strength and tensile strength are 425MPa and 570MPa, respectively, and the Rockwell hardness is 89.7. For non-Al steels the average oxidation rate is up to 0.421mg/(cm2·h) at 1373K. For high Al steels, when the mass fraction of Al is less than 5%, there is a thinner gray oxidized layer on surface and the oxidation rate is high; when the mass fraction of Al is more than 8.0%, the thin, close and yellow glossing film still exists, and the average oxidation rate is only 0.016mg/(cm2·h).
文摘Super-ductile and high strength manganese TWIP steels have received much attention in recent years.In the present work,two high Mn high Al steels with different stacking fault energies were investigated, microstructures were examined and mechanical properties were measured.The results showed that Fe-26Mn-6Al- 1C steel（6Al steel） exhibits high tensile strength and Fe-26Mn-12Al-1C steel（12Al steel） possesses a very high strength.Both steels exhibit good ductility.For 6Al steel with a moderate stacking fault energy（60 mJ/m;）, twinning is the major deformation mechanism;while dislocation slip dominates the deformation process of 12Al steel with stacking fault energy of 90 mJ/m;.
文摘M2 cast high speed steel was inoculated by addition of rare earth(RE)-Al-N, network eutectic carbides were eliminated, matrix microstructures were refined and the segregation of tungsten and molybdenum elements was relieved. In the condition that the hardness does not decrease, impact toughness obviously increases. Quenching at 1180 ℃ and three-times tempering at 560 ℃, the hardness of M2 cast high speed steel is 65～66 HRC, and impact toughness reaches 21.3 (J·cm^(-2)). Modified M2 cast high speed steel has excellent thermal fatigue resistance and high temperature wear resistance. Roller made in modified M2 cast high speed steel has excellent service effect when it is used in slit rolling mill of hot rolling bar mill.
文摘研究了合金元素Al对3种不同Al含量的Fe-28Mn-x Al-1C(x=8,10,12)系低密度钢层错能的影响。结果表明,3种实验钢的层错能范围为67.76~90.64 m J/m^2,Al对层错能的影响呈多项式分布。与28Mn-10Al及28Mn-8Al合金相比,28Mn-12Al合金层错能较高,抗拉强度高但伸长率低,在相同变形量下,28Mn-8Al与28Mn-10Al合金均出现了孪晶组织,且28Mn-8Al中孪晶更明显,而28Mn-12Al合金中未发现孪晶。3种合金的变形机制均为平面滑移变形,这归因于Fe-Mn-Al-C系合金中存在的短程有序会导致"滑移面软化现象",使高层错能的28Mn-12Al合金变形机制也为平面滑移。
