终轧温度对S35VN钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2020.11.019

金属热处理 ›› 2020, Vol. 45 ›› Issue (11): 99-104.DOI: 10.13251/j.issn.0254-6051.2020.11.019

终轧温度对S35VN钢组织与性能的影响

杨博¹, 曹睿¹, 闫英杰¹, 梁晨^2,3, 车洪艳^2,3, 秦巍^2,3, 王铁军^2,3

1.兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室, 甘肃兰州 730050;
2.中国钢研科技集团有限公司安泰科技股份有限公司, 北京 100081;
3.河北省热等静压工程技术研究中心, 河北涿州 072750

收稿日期:2020-04-18 出版日期:2020-11-25 发布日期:2020-12-29
通讯作者: 曹睿,教授,博士,E-mail: caorui@lut.cn
作者简介:杨博(1994—),男,硕士,主要研究方向为粉末冶金材料的制备及组织性能,E-mail: 453625924@qq.com。
基金资助:
国家自然科学基金(51675255, 51761027)

Effect of final rolling temperature on microstructure and mechanical properties of S35VN steel

Yang Bo¹, Cao Rui¹, Yan Yingjie¹, Liang Chen^2,3, Che Hongyan^2,3, Qin Wei^2,3, Wang Tiejun^2,3

1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, Lanzhou Gansu 730050, China;
2. Advanced Technology & Materials Limited Company, China Iron & Steel Research Institute Group, Beijing 100081, China;
3. Engineering and Technology Research Center of Hot Isostatic Pressing, Zhuozhou Hebei 072750, China

Received:2020-04-18 Online:2020-11-25 Published:2020-12-29

摘要/Abstract

摘要： 通过粉末冶金方法制备的S35VN高碳马氏体不锈钢被广泛应用在刀具材料中,该钢基体组织的类型以及在基体上分布的碳化物将直接影响其综合性能。利用热膨胀仪、维氏硬度计、X射线衍射仪及扫描电镜等研究了S35VN钢在热轧加工过程中不同终轧温度下的组织及力学性能的变化规律。结果表明:终轧温度为850 ℃时,组织为铁素体基体上弥散分布的细小碳化物,此时材料具有良好的综合力学性能:抗拉强度达到1003.5 MPa,断后伸长率为2.78％。随着终轧温度的提高,材料的基体组织由铁素体转变为马氏体,同时碳化物尺寸变大且数量减少,此时材料强度明显提高但塑性变差;当终轧温度进一步提高到950 ℃时,材料强度进一步提高但是塑性较差。

关键词: 高碳不锈钢, 终轧温度, 显微组织, 力学性能

Abstract: S35VN high carbon martensitic stainless steel prepared by powder metallurgy method is widely used as tool materials, and the type of its matrix microstructure and the carbides distributed in the matrix directly affect the comprehensive properties of the steel. The changes of microstructure and mechanical properties of the S35VN steel under different final rolling temperatures during hot rolling were studied by thermal dilatometer, Vickers hardness tester, X-ray diffractometer and scanning electron microscopy. The results show that at the final rolling temperature of 850 ℃, the microstructure is fine carbides dispersed in the ferrite matrix, and the material has good comprehensive mechanical properties, with the tensile strength and the elongation being 1003.5 MPa and 2.78%, respectively. With the increase of the final rolling temperature, the matrix structure of the material changes from ferrite to martensite, and the carbides become larger in size and less in quantity, and the strength of the material increases significantly but the plasticity deteriorates. When the final rolling temperature is further raised to 950 ℃, the material strength is further improved but the plasticity is poor.

Key words: high carbon stainless steel, final rolling temperature, microstructure, mechanical properties

中图分类号:

TG142.1

杨博, 曹睿, 闫英杰, 梁晨, 车洪艳, 秦巍, 王铁军. 终轧温度对S35VN钢组织与性能的影响[J]. 金属热处理, 2020, 45(11): 99-104.

Yang Bo, Cao Rui, Yan Yingjie, Liang Chen, Che Hongyan, Qin Wei, Wang Tiejun. Effect of final rolling temperature on microstructure and mechanical properties of S35VN steel[J]. Heat Treatment of Metals, 2020, 45(11): 99-104.

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终轧温度对S35VN钢组织与性能的影响

Effect of final rolling temperature on microstructure and mechanical properties of S35VN steel

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