1.抚顺特殊钢股份有限公司技术中心,抚顺 113001
2.东北大学冶金学院,沈阳 110819
孙常亮(1982—),男,本科,工程师;E-mail:sclmetal@163.com
收稿:2025-12-10,
修回:2026-01-12,
录用:2026-01-21,
网络首发:2026-02-09,
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孙常亮,辛光瀚,耿鑫.热处理阶段Nb质量分数对DHA新型热作模具钢组织与力学性能的影响[J].特殊钢,
Sun Changliang,Xin Guanghan,Geng Xin.Effect of Nb Content during Heat Treatment on Microstructure and Mechanical Properties of a Novel DHA Hot-Work Die Steel[J].Special Steel,
以新型热作模具钢DHA为研究对象,在钢中分别添加
w
[Nb]0、0.009%、0.019%、0.028%、0.038%。探究了Nb对DHA钢组织和力学性能的影响。结果表明,Nb的添加促进了凝固过程中大尺寸的液析碳氮化物的形成,加重了铸态组织中二次枝晶的偏析程度。Nb的添加使实验钢在回火后的晶粒尺寸更小。随着Nb含量的增加,实验钢的韧性变化规律是在560 、590 ℃回火后韧性逐渐降低,在620 ℃回火后,韧性先升高后降低;实验钢的强度变化规律是先升高后降低。对力学性能综合考虑,
w
[Nb]添加为0.019%时,DHA钢具有最佳的力学性能。
Hot-work die steel(DHA) steel was selected as the research object and adds Niobium (Nb) elements with mass fractions of 0, 0.009%, 0.019%, 0.028%, and 0.038% to the steel. The influence of Nb on the microstructure and mechanical properties of DHA steel was investigated. The results show that Nb addition promotes the formation of large-sized primary carbonitrides during solidification, and aggravates the secondary dendrites segregation in the as-cast microstructure. Nb addition refines the grain size of the experimental steel after tempering. With the increase of Nb mass fraction, toughness gradually decreases after tempering at 560 ℃ and 590 ℃, and first increases and then decreases after tempering at 620 ℃. Strength first increases and then decreases with increasing Nb content. Considering the comprehensive mechanical properties, when the mass fraction of Nb element is 0.019%, DHA steel has the best performance.
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