析出相对塑料模具钢LJ338ESR腐蚀性能的影响

特殊钢 ›› 2018, Vol. 39 ›› Issue (4): 58-62.

所属专题：模具钢

析出相对塑料模具钢LJ338ESR腐蚀性能的影响

柯明鹏¹, 刘宏玉^1,2, 贺吉白¹, 李民华³, 方皓彦¹, 卢建夺¹

1武汉科技大学理学院，武汉430065 ；
2冶金工业过程系统科学湖北省重点实验室，武汉430065 ；
3湖北上大模具材料科技股份有限公司，鄂州436054

收稿日期:2018-02-08 出版日期:2018-08-01 发布日期:2022-06-01
作者简介:柯明鹏(1993-)，男，硕士生(2015年武汉科技大学),2011年武汉科技大学(本科)毕业,金属材料工艺研究。
基金资助:
湖北省自然科学基金资助项目(2014CFB801)

Effect of Precipitation Phases on Corrosion Performance of Mold Steel LJ338ESR for Plastics

Ke Mingpeng¹, Liu Hongyu^1,2, He Jibai¹ ,Li Minhua³ ,Fang Haoyan¹ , Lu Jianduo¹

1 College o£ Science, Wuhan University of Science and Technology, Wuhan 430065 ；
2 Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan 430065 ；
3 Hubei Shangda Mould Materials Technology Co., Ltd. , Ezhou 436054

Received:2018-02-08 Published:2018-08-01 Online:2022-06-01

摘要/Abstract

摘要： 利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、硬度仪、电化学分析仪,研究了塑料模具钢LJ338ESR经不同固溶和时效温度处理后的组织、硬度和腐蚀性能变化。结果表明,固溶温度为1 000～1 090℃时,随固溶温度上升,合金元素及NbC更多地溶入基体中,使得组织的均匀性增加,水冷后马氏体量增加,导致硬度上升,而耐蚀性能增强。时效温度为300～450℃时,随温度上升,细小富Cu相形核并与基体形成共格bcc结构,共格应变能逐渐增大,导致硬度上升,而耐蚀性能减弱;当时效温度为450～600℃时,随温度上升,富Cu相逐渐由共格过渡到非共格态,共格应变能降低,导致硬度下降,而耐蚀性能增强。600℃形成的逆变奥氏体进一步提高了耐蚀性。

Abstract: The microstructure, hardness and corrosion resistance of mold steel U338ESR for plastics treated at various solution and aging temperatures, were investigated by means of optical microscope (OM) , scanning electron microscope (SEM) , transmission electron microscope (TEM) , hardness tester and electrochemical analyzer. The results showed that with the increase of solution temperatures, which were at the range of 1 000 ~ 1 090 °C , alloying elements and NbC dissolved more into matrix, the uniformity of microstructures and the amount of martensite increased after water cooling, leading to the increase of hardness and the enhancement of corrosion resistance. When the aging temperatures were at the range of 300 -450 °C ，with the increase of temperatures, small Cu-rich phases nucleated and formed coherent bcc structure with the matrix and the coherent strain energy increased gradually, resulting in the increase of hardness and the decrease of corrosion resistance ； when the aging temperatures were at the range of 450 〜600°C , with the increase of temperatures, the Cu-rich phases transferred from coherent to incoherent state gradually, the coherent strain energy decreased, resulting in the decrease of hardness and the enhancement of the corrosion resistance. Reversed austenite formed at 600 °C, enhanced corrosion resistance further.

柯明鹏, 刘宏玉, 贺吉白, 李民华, 方皓彦, 卢建夺. 析出相对塑料模具钢LJ338ESR腐蚀性能的影响[J]. 特殊钢, 2018, 39(4): 58-62.

Ke Mingpeng, Liu Hongyu, He Jibai , Li Minhua , Fang Haoyan , Lu Jianduo. Effect of Precipitation Phases on Corrosion Performance of Mold Steel LJ338ESR for Plastics[J]. Special Steel, 2018, 39(4): 58-62.

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析出相对塑料模具钢LJ338ESR腐蚀性能的影响

Effect of Precipitation Phases on Corrosion Performance of Mold Steel LJ338ESR for Plastics

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