摘要
通过材料成分控制和热处理制度优化掌握了主要合金元素、淬火和回火温度以及淬火冷却速度对压紧弹簧用国产Z12CN13不锈钢大锻环力学性能的影响规律。完成国产Z12CN13不锈钢大锻环的评定,达到了设计标准要求的各项性能。结果表明要同时达到技术条件规定的强度和韧性指标,主要合金元素应取中上限。随淬火温度的升高,国产Z12CN13不锈钢强度、塑性、韧性下降;随回火温度的升高,其强度下降,塑性、韧性升高;淬火冷却速度明显影响材料的抗拉强度和冲击韧性,提高淬火冷却速度可同时满足强度和冲击韧性指标要求。985℃淬火并快冷,640℃回火后国产Z12CN13不锈钢综合力学性能和强韧性配比最佳。
Effects of alloying elements, quenching and tempering temperatures and cooling rate on the mechanical properties of Z12CN13 stainless steel was investigated by controlling material composition and optimizing heat treatments. The performance of forged domestic Z12CN13 stainless steel for Hold-Down Spring of reactor were evaluated, and various properties of the materials were found meeting the design standards. The results show that the main alloying elements should take the upper limits of composition in order for the materials to reach the technical standards of strength and toughness. The strength, the plasticity and the toughness of the forged domestic Z12CN13 stainless steel all decrease with increasing quenching temperature. On the contrary, the strength reduces, and the plasticity and the toughness go up with the tempering temperature rise. The tensile strength and the impact toughness of the materials are influenced obviously by the cooling rate of quenching. The enhancement in cooling rate can meet the technical standards of both strength and toughness at the same time. The overall mechanical properties and the combination of strength and toughness are optimal when quenched at 985℃ followed by fast cooling and 640℃ aging.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2013年第3期456-460,共5页
Journal of Materials Science and Engineering
