高碳合金钢75Cr1高温变形后相和组织的转变

特殊钢 ›› 2016, Vol. 37 ›› Issue (1): 57-59.

高碳合金钢75Cr1高温变形后相和组织的转变

胡松涛¹, 余万华², 廉晓洁¹, 翟士斌²

1太原钢铁(集团)有限公司技术中心，太原030003 ；
2北京科技大学材料科学与工程学院，北京100083

出版日期:2016-02-01 发布日期:2022-08-25
作者简介:胡松涛(1967-),男，硕士(2009年天津大学),教授級高级工程师,1989年北京科技大学(本科)毕业,热连轧工艺技术、质量控制、新产品新技术开发。

Transformation of Phases and Structure in Elevated-Temperature Deformed High Carbon Alloy Steel 75Cr1

Hu Songtao¹, Yu Wanhua², Lian Xiaojie^1,Zhai Shibin²

1 Technology Center, Taiyuan Iron and Steel (Group) Co Ltd, Taiyuan 030003 ；
2 School of Materials Science and Technology, University of Science and Technology, Beijing 100083)

Published:2016-02-01 Online:2022-08-25

摘要/Abstract

摘要： 通过Gleeble-3800热模拟机将高碳合金钢75Cr1(/%:0.75C,0.27Si,0.85Mn,0.010P,0.003S,0.60Cr)在1090℃以15 s^-1进行第1道次25%压缩变形,以20℃/s冷却至880℃,20 s^-1进行第2道次25%压缩变形,再分别以0.05~45℃/s不同冷速冷却至室温,得出连续冷却转变(CCT)曲线和冷却速率对该钢相和组织的影响。结果表明,相变临界Ac₁和Ac₃分别为730℃和773℃;冷速低于1℃/s时钢的组织主要为先共析铁素体和细小珠光体,冷速在1~10℃/s时钢的组织为珠光体和贝氏体,冷速高于10℃/s时组织中会出现马氏体,马氏体会随着冷速的增加逐渐增多,当冷速大于18℃/s时,钢的组织以马氏体为主,含有极少量的贝氏体。

Abstract: The continuous cooling transformation ( CCT) curves of high carbon alloy steel 75Crl (/% : 0. 75C, 0. 27Si, 0. 85Mn, 0. 010P, 0.003S, 0.60Cr) and the effect of cooling rate on phases and structure of steel are obtained by Gleeble-3800 thermal simulation testing machine to carry out first reduction 25% deformation with deformation rate 15 s"1 at 1 090 °C then with 20 °C/s cooling to 880 °C and second reduction 25% with deformation rate 20 s^-1 then with 0. 05 〜 45 ℃ /s cooling to ambient temperature. Results show that the critical points of phase transformation Ac ₁and Ac₃ are respectively 730 °C and 773 °C ; with cooling rate being lower than 1°C /s the main structure of steel is proeutectoid ferrite and fine pearlite, with cooling rate being 1 〜10 °C/s, the structure of steel is pearlite and bainite; with cooling rate being larger than 10 °C/s the martensite occurs in structure and with increasing cooling rate the amount of martensite increases, and with cooling rate being larger than 18 °C/s the main structure of steel is martensite and has minor bainite.

胡松涛, 余万华, 廉晓洁, 翟士斌. 高碳合金钢75Cr1高温变形后相和组织的转变[J]. 特殊钢, 2016, 37(1): 57-59.

Hu Songtao, Yu Wanhua, Lian Xiaojie, Zhai Shibin. Transformation of Phases and Structure in Elevated-Temperature Deformed High Carbon Alloy Steel 75Cr1[J]. Special Steel, 2016, 37(1): 57-59.