硫含量对Y12Cr18Ni9易切削钢中硫化物形态及性能的影响

doi:10.13251/j.issn.0254-6051.2023.09.031

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 183-190.DOI: 10.13251/j.issn.0254-6051.2023.09.031

硫含量对Y12Cr18Ni9易切削钢中硫化物形态及性能的影响

王英虎^1,2,3

1.成都先进金属材料产业技术研究院股份有限公司, 四川成都 610000;
2.海洋装备用金属材料及其应用国家重点实验室, 辽宁鞍山 114009;
3.北京科技大学国家材料服役安全科学中心, 北京 100083

收稿日期:2023-04-06 修回日期:2023-07-09 出版日期:2023-09-25 发布日期:2023-10-25
作者简介:王英虎(1992—),男,工程师,博士研究生,主要研究方向为先进金属材料及加工技术,E-mail:hihihowareyou@163.com

Effect of sulfur content on sulfide morphologies and properties of Y12Cr18Ni9 free-cutting steel

Wang Yinghu^1,2,3

1. Chengdu Institute of Advanced Metallic Material Technology and Industry Co., Ltd., Chengdu Sichuan 610000, China;
2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
3. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China

Received:2023-04-06 Revised:2023-07-09 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 采用扫描电镜、扫描电镜-能谱仪、电子探针、背散射电子衍射等方法研究了硫含量对Y12Cr18Ni9易切削钢中硫化物形态及性能的影响。利用Thermo-Clac软件中的TCFE10数据库对Y12Cr18Ni9易切削钢的相图和平衡凝固相变路径进行计算,分析了硫含量变化对硫化物析出规律的影响。结果表明,Y12Cr18Ni9易切削钢中的平衡相主要有L(液相)、MnS、δ、γ、M₂₃C₆、σ与α。硫化物为球形、椭球形、纺锤形或短棒状,呈链状分布在晶界处或呈团簇状聚集分布在三叉晶界处,属于第Ⅱ类硫化物。随着硫含量增加,试验钢中单位面积内硫化物析出数量增加,硫化物的平均面积增加,硫含量增加可促进Y12Cr18Ni9易切削钢中硫化物的析出。随着试验钢中簇状硫化物数量增多,拉伸断口准解理面增大,逐渐向脆性断裂转变,材料的力学性能下降。

关键词: Y12Cr18Ni9易切削钢, 硫化物, 硫含量, 力学性能, 电子探针, 电子背散射衍射

Abstract: Effect of sulfur content on sulfide morphology and properties of Y12Cr18Ni9 free-cutting steel was studied by means of SEM, SEM-EDS, EPMA and EBSD, etc. The phase diagram and equilibrium solidification transformation path of the Y12Cr18Ni9 free-cutting steel were calculated by TCFE10 database of Thermo-Clac software, and the effect of sulfur content change on sulfide precipitation was analyzed. The result show that the main equilibrium phases in the Y12Cr18Ni9 free-cutting steel are Liquid, MnS, δ, γ, M₂₃C₆, σ and α. The sulfides are spherical, ellipsoidal, spindle shape or short-bar-like, which are distributed in chains at grain boundaries or clustered at the trident junction, belonging to a type of II sulfide. With the increase of sulfur content, the amount of sulfide precipitation per unit area in the tested steel increases, and the average area of sulfide increases. The increase of sulfur content can promote the precipitation of sulfide in the Y12Cr18Ni9 free-cutting steel. With the increase of the number of cluster sulfides in the tested steel, the quasi-cleavage surface area of the tensile fracture increases, gradually transforms into brittle fracture, and the mechanical properties of the material decrease.

Key words: Y12Cr18Ni9 free-cutting steel, sulfide, sulfur content, mechanical properties, EPMA, EBSD

中图分类号:

TG142.1⁺3

王英虎. 硫含量对Y12Cr18Ni9易切削钢中硫化物形态及性能的影响[J]. 金属热处理, 2023, 48(9): 183-190.

Wang Yinghu. Effect of sulfur content on sulfide morphologies and properties of Y12Cr18Ni9 free-cutting steel[J]. Heat Treatment of Metals, 2023, 48(9): 183-190.

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硫含量对Y12Cr18Ni9易切削钢中硫化物形态及性能的影响

Effect of sulfur content on sulfide morphologies and properties of Y12Cr18Ni9 free-cutting steel

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