Effect of Nb Content during Heat Treatment on Microstructure and Mechanical Properties of a Novel DHA Hot-Work Die Steel

Sun Changliang; Xin Guanghan; Geng Xin

doi:10.20057/j.1003-8620.N250591

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Effect of Nb Content during Heat Treatment on Microstructure and Mechanical Properties of a Novel DHA Hot-Work Die Steel

更新时间：2026-04-07

- Effect of Nb Content during Heat Treatment on Microstructure and Mechanical Properties of a Novel DHA Hot-Work Die Steel
- Special Steel Pages: 1-9(2026)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250591
  CLC： TF704.2
- Received：10 December 2025，
  
  Revised：2026-01-12，
  
  Accepted：21 January 2026，
  
  Online First：09 February 2026，
- 稿件说明：
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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,
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, DOI：.

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, DOI：.

摘要

以新型热作模具钢DHA为研究对象，在钢中分别添加

［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，

［Nb］添加为0.019%时，DHA钢具有最佳的力学性能。

Abstract

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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references

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