SWRCH35K钢连续冷却转变曲线的测定与分析

doi:10.13251/j.issn.0254-6051.2023.04.004

金属热处理 ›› 2023, Vol. 48 ›› Issue (4): 23-27.DOI: 10.13251/j.issn.0254-6051.2023.04.004

SWRCH35K钢连续冷却转变曲线的测定与分析

王子波¹, 江畅¹, 陆恒昌^1,2, 满廷慧¹, 左锦中³, 董瀚^1,2

1.上海大学材料科学与工程学院, 上海 200444;
2.上海大学浙江高端装备基础件材料研究院, 浙江嘉善 314113;
3.中天钢铁集团有限公司技术中心, 江苏常州 213011

收稿日期:2022-09-23 修回日期:2022-12-28 发布日期:2023-05-27
通讯作者: 陆恒昌,讲师,博士,E-mail:luhengchang@shu.edu.cn
作者简介:王子波(1997—),男,硕士研究生,主要研究方向为冷镦钢在线软化的主要物理冶金现象及冷作硬化非调质钢强韧性机理,E-mail:wangzibo1097@163.com。
基金资助:
上海市军民融合发展专项资金(2020-jmrh1-kj31)

Determination and analysis of continuous cooling transformation curves of SWRCH35K steel

Wang Zibo¹, Jiang Chang¹, Lu Hengchang^1,2, Man Tinghui¹, Zuo Jinzhong³, Dong Han^1,2

1. School of Materials and Science Engineering, Shanghai University, Shanghai 200444, China;
2. Zhejiang Institute of Advanced Materials, SHU, Jiashan Zhejiang 314113, China;
3. Technology Center, Zenith Steel Group Co., Ltd., Changzhou Jiangsu 213011, China

Received:2022-09-23 Revised:2022-12-28 Published:2023-05-27

摘要/Abstract

摘要： 使用DIL805A热膨胀仪测定了SWRCH35K钢的热膨胀曲线。采用切线法结合微观组织及硬度,绘制了试验钢的连续冷却转变(CCT)曲线,分析了冷却速率对试验钢连续冷却过程组织演变的影响。结果表明,冷速在0.1~1 ℃/s范围时,试验钢的组织为多边形先共析铁素体和珠光体,随着冷速增加,组织细化,珠光体含量增加,硬度为148~165 HV;冷速为3 ℃/s时,开始出现少量魏氏组织及贝氏体,硬度增加至189 HV;冷速为5~50 ℃/s时,铁素体沿晶界呈网状,针状魏氏组织增加,组织为晶界铁素体、珠光体、魏氏组织和贝氏体,其中冷速为30~50 ℃/s时,铁素体含量大幅减少且尺寸明显减小,硬度为225~237 HV。珠光体在不同冷速下的形态不同,冷速较小时以片层及短棒状为主,还有少量球状,随着冷速增加,短棒状珠光体占比增加,片层及球状珠光体占比减小。

关键词: SWRCH35K钢, CCT曲线, 微观组织, 珠光体, 硬度

Abstract: Thermal dilatometric curves of SWRCH35K steel were measured by DIL805A thermal dilatometer. The continuous cooling transformation (CCT) curves of the tested steel were drawn by the tangent method combined with the microstructure and hardness. The influence of the cooling rate on microstructure evolution of the tested steel during the continuous cooling process was analyzed. The results show that when the cooling rate is in the range of 0.1-1 ℃/s, the microstructure is polygonal proeutectoid ferrite and pearlite. With the increase of the cooling rate, the microstructure is refined, the content of pearlite increases, and the hardness is 148-165 HV. When the cooling rate is 3 ℃/s, a small amount of Widmanstátten structure and bainite begin to appear, and the hardness increases to 189 HV. When the cooling rate is in the range of 5-50 ℃/s, the ferrite appears as network along the grain boundary, and the acicular Widmanstátten structure increases, the microstructure is composed of ferrite at grain boundary, pearlite, Widmanstátten structure and bainite. When the cooling rate is 30-50 ℃/s, the ferrite content and size are greatly reduced, and the hardness is 225-237 HV. The morphology of pearlite changes differently under different cooling rates. When the cooling rate is small, the morphology of pearlite is mainly lamellar and short rod-shaped, and with a small amount of spherical. With the increase of cooling rate, the proportion of short rod-shaped pearlite increases, and the proportion of the lamellar and spherical pearlite decreases.

Key words: SWRCH35K steel, CCT curve, microstructure, pearlite, hardness

中图分类号:

TG142.1

王子波, 江畅, 陆恒昌, 满廷慧, 左锦中, 董瀚. SWRCH35K钢连续冷却转变曲线的测定与分析[J]. 金属热处理, 2023, 48(4): 23-27.

Wang Zibo, Jiang Chang, Lu Hengchang, Man Tinghui, Zuo Jinzhong, Dong Han. Determination and analysis of continuous cooling transformation curves of SWRCH35K steel[J]. Heat Treatment of Metals, 2023, 48(4): 23-27.

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SWRCH35K钢连续冷却转变曲线的测定与分析

Determination and analysis of continuous cooling transformation curves of SWRCH35K steel

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