热处理工艺对SDP80C钢组织及性能的影响

doi:10.13251/j.issn.0254-6051.2025.02.038

金属热处理 ›› 2025, Vol. 50 ›› Issue (2): 241-246.DOI: 10.13251/j.issn.0254-6051.2025.02.038

热处理工艺对SDP80C钢组织及性能的影响

陈晟楠, 彭睿智, 吴晓春

上海大学材料科学与工程学院, 上海 200072

收稿日期:2024-08-11 修回日期:2024-12-23 发布日期:2025-04-10
通讯作者: 吴晓春,教授,博士生导师,E-mail:xcwu@staff.shu.edu.cn
作者简介:陈晟楠(1996—),男,硕士,主要研究方向为压铸模具钢,E-mail:csn0904@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 2022-Z12)

Influence of heat treatment process on microstructure and properties of SDP80C steel

Chen Shengnan, Peng Ruizhi, Wu Xiaochun

School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

Received:2024-08-11 Revised:2024-12-23 Published:2025-04-10

摘要/Abstract

摘要： 利用热膨胀相变仪测定了预硬型压铸模具钢SDP80C的奥氏体连续冷却转变曲线,研究了不同时效工艺下的组织与力学性能。结果表明,SDP80C钢的马氏体开始转变温度(Ms)为320 ℃,奥氏体开始转变温度(Ac₁)为695 ℃,奥氏体转变终了温度(Ac₃)为841 ℃。在525~600 ℃时效温度范围内,时效温度的升高促进NiAl相和富Cu相的形成和生长,且马氏体组织发生回复,综合作用下SDP80C钢硬度逐渐降低,冲击性能得到提高。在525 ℃时效2 h后,由于纳米级NiAl相和富Cu相的析出强化,SDP80C钢达到最大硬度44.9 HRC,冲击吸收能量约为123 J。

关键词: 压铸模具钢SDP80C, 时效工艺, 硬度, 冲击性能, NiAl相

Abstract: Austenite continuous cooling transformation curve of pre-hardened die casting steel SDP80C was measured by using a thermal dilatometer, and the microstructure and mechanical properties under different aging processes were studied. The results show that the martensitic transformation starting temperature (Ms) of the SDP80C steel is 320 ℃, the austenite transformation starting temperature (Ac₁) is 695 ℃, and the austenite transformation ending temperature (Ac₃) is 841 ℃. Within the aging temperature range of 525-600 ℃, the increase of aging temperature promotes the formation and growth of NiAl phase and Cu-rich phase, and the martensite recovers. As a result, the hardness of the SDP80C steel gradually decreases while the impact property improves. After aging at 525 ℃ for 2 h, the SDP80C steel reaches the maximum hardness of 44.9 HRC and the impact absorbed energy is about 123 J, which is attribute to the precipitation strengthening of nano-scale NiAl phase and Cu-rich phase.

Key words: die casting mold steel SDP80C, aging process, hardness, impact property, NiAl phase

中图分类号:

TG178

陈晟楠, 彭睿智, 吴晓春. 热处理工艺对SDP80C钢组织及性能的影响[J]. 金属热处理, 2025, 50(2): 241-246.

Chen Shengnan, Peng Ruizhi, Wu Xiaochun. Influence of heat treatment process on microstructure and properties of SDP80C steel[J]. Heat Treatment of Metals, 2025, 50(2): 241-246.

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热处理工艺对SDP80C钢组织及性能的影响

Influence of heat treatment process on microstructure and properties of SDP80C steel

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