非调质钢C38N2 ø170 mm热轧材连续冷却转变的研究

特殊钢 ›› 2014, Vol. 35 ›› Issue (1): 57-60.

非调质钢C38N2 ø170 mm热轧材连续冷却转变的研究

文成¹, 蒋波¹, 杨忠², 王海龙², 刘雅政¹

1北京科技大学材料科学与工程学院，北京100083；
2西宁特殊钢集团有限责任公司，西宁810005

收稿日期:2013-08-07 出版日期:2014-02-01 发布日期:2022-09-06
作者简介:文成(1989-),男，硕士研究生(北京科技大学),2007年安徽工业大学(本科)毕业，曲轴用钢C38N2的轧制工艺优化及组织性能控制研究。

A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2

Wen Cheng¹, Jiang Bo¹ , Yang Zhong², Wang Hailong² , Liu Yazheng¹

1 School of Materials Science and Engineering, University of Science and Technology, Beijing 100083;
2 Xining Special Steel Co Ltd, Xining 810005

Received:2013-08-07 Published:2014-02-01 Online:2022-09-06

摘要/Abstract

摘要： 采用热膨胀法和金相法,通过Gleeble-1500热模拟试验机试验研究了非调质钢C38N2(/%:0.38C,0.55Si,1.42Mn,0.011P,0.047S,0.03Nb,0.015Ti,0.022Al,0.020N)在冷却速度0.5~20℃/s时的动态(950℃,变形速率5 s^-1,50%变形,冷却至室温)和静态(未变形,880℃冷却至室温)的连续冷却转变(CCT)曲线。结果表明,未变形时非调质钢C38N2当冷却速度0.5℃/s时为铁素体-珠光体组织,3.0℃/s时为贝氏体+铁素体-珠光体组织,›3.0~11℃/s时为贝氏体+马氏体组织,15℃/s时为马氏体组织;当冷却速度≤11℃/s时动态CCT的相变开始温度均大于静态CCT相变开始温度。

Abstract: The dynamic (deforming 50% at 950 °C with deformation rate 5 s^-1, cooling to ambient) and static (nondeforming, 880 °C, cooling to ambient) continuous cooling transformation (CCT) curves with cooling rate 0. 5 ~20 °C/s of non-quenching-and-tempering steel C38N2 (/%: 0. 38C,0. 55Si, 1.42Mn,0. 011P,0. 047S,0. 03Nb,0. 015Ti,0. 022Al, 0. 020N) have been tested and studied with using Gleeble-1500 thermal simulation machine by thermal expansion dilation method and metallographic examination. Results show that for non-deforming steel, with cooling rate 0. 5 °C/s, the structure of non-quenching-and-tempering steel C38N2 is ferrite-pearlite, as cooling rate is 3. 0 °C/s its structure is bainite + ferrite-pearlite, with cooling rate >3. 0 ~ 11 °C/s the steel has bainite + martensite structure and with 15 ^C/s the structure of steel is martensite； as cooling rate ≤11℃/s, all the phase transformation initial temperature of dynamic CCT is larger than that of static CCT.

文成, 蒋波, 杨忠, 王海龙, 刘雅政. 非调质钢C38N2 ø170 mm热轧材连续冷却转变的研究[J]. 特殊钢, 2014, 35(1): 57-60.

Wen Cheng , Jiang Bo , Yang Zhong, Wang Hailong, Liu Yazheng. A Study on Continuous Cooling Transformation of ø170 mm Hot-Rolled Products of Non-Quenching-and-Tempering Steel C38N2[J]. Special Steel, 2014, 35(1): 57-60.