缺口类型对Cr5系热作模具钢冲击性能的影响

doi:10.13251/j.issn.0254-6051.2024.01.001

金属热处理 ›› 2024, Vol. 49 ›› Issue (1): 1-8.DOI: 10.13251/j.issn.0254-6051.2024.01.001

• 组织与性能 • 下一篇

缺口类型对Cr5系热作模具钢冲击性能的影响

尉筱杰^1,2, 左鹏鹏³, 吴晓春^1,2

1. 上海大学省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200072;
2. 上海大学材料科学与工程学院, 上海 200072;
3. 江苏科技大学材料科学与工程学院, 江苏镇江 212000

收稿日期:2023-08-08 修回日期:2023-11-02 发布日期:2024-02-29
通讯作者: 吴晓春,教授,博士生导师,E-mail:wuxiaochun@shu.edu.cn
作者简介:尉筱杰(1998—),男,硕士研究生,主要研究方向为热作模具钢开发,E-mail:wxj534785222@163.com。
基金资助:
省部共建高品质特殊钢冶金与制备国家重点实验室自主课题(SKLASS 2021-Z13)

Effect of notch type on impact properties of Cr5-series hot work die steels

Wei Xiaojie^1,2, Zuo Pengpeng³, Wu Xiaochun^1,2

1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
3. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212000, China

Received:2023-08-08 Revised:2023-11-02 Published:2024-02-29

摘要/Abstract

摘要： 通过冲击试验研究了3种Cr5系钢(H13、H11、DVA)在不同回火温度下无缺口、U型缺口及V型缺口冲击性能的变化规律,采用体视显微镜和扫描电镜(SEM)对断口形貌和微观组织进行表征,讨论了缺口类型对表征材料韧性的差异性。结果表明,V(U)型缺口冲击能量更多作用于裂纹扩展,反应材料抵抗裂纹扩展能力,可用于测量材料的裂纹敏感性,且V型缺口由于缺口尖端曲率半径更小更适用于表征材料的裂纹敏感性。无缺口冲击能量分别作用于裂纹形成及裂纹扩展,由于裂纹易在缺陷处形成,因此可反映材料综合强韧性及冶金缺陷。对比发现,在常用回火温度范围内,600 ℃V型缺口冲击吸收能量达到最大值,表明该热处理状态下材料抵抗裂纹扩展能力最佳;H13、DVA、H11钢分别在560、580、560 ℃无缺口冲击吸收能量较高,且硬度下降较少,分别为53.1、50.6、52.2 HRC,综合强韧性最佳。

关键词: Cr5系钢, 回火工艺, 冲击性能, 回火脆性

Abstract: The changing mechanism of impact properties of three Cr5 steels (H13, H11 and DVA) with unnotched, U-notched and V-notched at different tempering temperatures was studied. The fracture morphologies and microstructure were observed by using body microscopy and scanning electron microscope(SEM) and the difference of notch type in characterizing toughness was discussed. The results show that the V(U)-notched impact energy acts more on the crack extension, reflecting the ability of the material to resist crack propagation, which can be used to measure the crack sensitivity of the material, and the V-notch is more suitable for characterizing the crack sensitivity of the material due to the smaller radius of curvature on the notch tip. The unnotched impact energy acts on crack initiation and propagation, which can reflect comprehensive toughness and metallurgical defects due to the cracks are easily formed at crystal defect. Through comparison, it's that in the common tempering temperature range, 600 ℃ V-notch impact absorbed energy reaches its maximum value, indicating that the heat treatment state of the material resistance to crack expansion ability of the best; notchless impact absorbed energy of the H13, DVA, H11 steel at 560, 580, 560 ℃ is higher, and the hardness decreased less, respectively, 53.1, 50.6, 52.2 HRC, the comprehensive strength and toughness of the best.

Key words: Cr5-series steels, tempering process, impact properties, tempering brittleness

中图分类号:

TG142.1

尉筱杰, 左鹏鹏, 吴晓春. 缺口类型对Cr5系热作模具钢冲击性能的影响[J]. 金属热处理, 2024, 49(1): 1-8.

Wei Xiaojie, Zuo Pengpeng, Wu Xiaochun. Effect of notch type on impact properties of Cr5-series hot work die steels[J]. Heat Treatment of Metals, 2024, 49(1): 1-8.

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缺口类型对Cr5系热作模具钢冲击性能的影响

Effect of notch type on impact properties of Cr5-series hot work die steels

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