胀断连杆用非调质钢C70S6的材料特性及组织性能控制

材料导报

2020, Vol. 34

Issue (Z1): 444-447

金属与金属基复合材料

胀断连杆用非调质钢C70S6的材料特性及组织性能控制

张朝磊¹, 胡佳丽¹, 李戬², 苗红生³, 刘雅政¹

1 北京科技大学材料科学与工程学院,北京 100083;
2 青海大学机械工程学院,西宁 810016;
3 西宁特殊钢股份有限公司,青海省特殊钢工程技术研究中心,西宁 810005

Characteristic and Properties Control of Air-cooled Forging Steel C70S6 forFracture Splitting Connecting Rod

ZHANG Chaolei¹, HU Jiali¹, LI Jian², MIAO Hongsheng³, LIU Yazheng¹

1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 School of Mechanical Engineering, Qinghai University, Xining 810016, China;
3 Xining Special Steel Co. Ltd, Qinghai Special Steel Engineering Technology Research Center, Xining 810005, China

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摘要采用金相分析、硬度测定和热模拟压缩变形等实验,结合采集的工业生产数据,研究了胀断连杆用非调质钢C70S6的材料特性及组织性能控制。主要包括动态连续冷却相变规律及其影响,先共析铁素体的特性及影响,以及硬度的影响因素分析及控制。结果表明:动态连续冷却过程中,随着冷速在0.5~20 ℃/s范围内变化时,组织类型和含量的变化均不大;金相检验误判是部分连杆锻造企业发现连杆内部存在铁素体含量超标的主要原因;碳当量和索氏体化率是调控硬度的关键。

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关键词: 胀断连杆非调质钢连续冷却相变带状组织索氏体化率

Abstract: The material characteristic, structure and property control of the air-cooled forging steel C70S6 for the expanding fracture connecting rod were studied by means of metallographic analysis, hardness measurement and thermal simulated compression deformation, combined with the industrial production data collected. It mainly includes the dynamic continuous cooling transformation law and its influence, the characteristic and influence of proeutectoid ferrite, and the analysis and control of the influence factors of hardness. Results showed that the change of microstructure type and content is not significant with the change of cooling rate in the range of 0.5—20 ℃/s in the process of dynamic continuous cooling. And the main reason why some forging enterprises find that the ferrite content in the connecting rod exceeds the standard is the misjudgment of metallographic examination. And carbon equivalent and sorbitization rate are the key to control hardness.

Key words: fracture splitting connecting rod air-cooled forging steel continuous cooling transformation banded structure sorbitization rate

发布日期: 2020-07-01

ZTFLH:

TG142.1

基金资助: 青海省基础研究计划项目(2018-ZJ-751)

作者简介: 张朝磊,北京科技大学材料科学与工程学院副教授。2013年1月毕业于北京科技大学材料加工工程专业,获工学博士学位。毕业后留校工作至今,主要从事材料组织性能控制,先进钢铁材料成分组织设计、质量控制与应用技术等研究工作。在国内外期刊作为第一作者和通信作者发表论文40余篇,授权发明专利10余项。

引用本文:

张朝磊, 胡佳丽, 李戬, 苗红生, 刘雅政. 胀断连杆用非调质钢C70S6的材料特性及组织性能控制[J]. 材料导报, 2020, 34(Z1): 444-447.
ZHANG Chaolei, HU Jiali, LI Jian, MIAO Hongsheng, LIU Yazheng. Characteristic and Properties Control of Air-cooled Forging Steel C70S6 forFracture Splitting Connecting Rod. Materials Reports, 2020, 34(Z1): 444-447.

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http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2020/V34/IZ1/444

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