42CrMo钢圆坯芯部热裂形成条件热模拟

doi:10.13228/j.boyuan.issn1006-9356.20230020

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (4043 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要芯部裂纹是大断面连铸圆坯的主要缺陷,严重影响铸坯及轧材质量。由于缺乏定量判据,铸坯芯部裂纹的准确预测成为业界难题。结合数值模拟和凝固过程热模拟方法,研究了42CrMo钢连铸圆坯芯部热裂纹形成条件,并对铸坯芯部热裂风险进行了评估。首先,通过有限元模型计算了42CrMo钢圆坯芯部冷却速率和凝固末期的应变速率,为热模拟试验提供控制参数;然后,利用凝固裂纹热模拟装置再现了铸坯芯部凝固过程并在凝固末期主动加载,获得42CrMo钢圆坯芯部热裂纹形成的临界应变速率为2.12×10^-4~2.82×10^-4 /s,热裂温度为1 452 ℃,断裂应力为0.67 MPa。比较数值模拟与热模拟结果表明,当前连铸条件下铸坯中心热裂风险高,极易形成热裂纹。本研究也为连铸坯热裂风险评估提供了新的途径。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	作者相关文章
	陈美成
	赵宇
	郭庆涛
	林增煌
	仲红刚
	翟启杰

关键词 ：连铸, 热裂, 热模拟, 数值模拟, 应变速率

Abstract：The central crack is the main defect of large section continuous casting round blooms, which seriously affects the quality of blooms and rolled products. Due to the lack of quantitative criteria, the accurate prediction for central crack of bloom has become a difficult problem in metallurgy industry. Combined with numerical simulation and thermal simulation method of solidification process, the critical conditions of hot tearing formation in the center of 42CrMo steel continuous casting round bloom were studied, and its risk in the center of bloom was evaluated. Firstly, through finite element simulation, the cooling rate at the center of 42CrMo steel round bloom and the strain rate at the end of solidification were calculated under continuous casting conditions to provide control parameters for thermal simulation test. Furthermore, taking the center of bloom as the characteristic unit, using the hot tearing thermal simulator to reoccure its cooling rate and actively loading at the end of solidification, the critical conditions for hot tearing of 42CrMo steel under continuous casting conditions were obtained. The critical strain rate for hot tearing is 2.12×10^-4-2.82×10^-4 /s, the fracture temperature is around 1 452 ℃, and the fracture stress is 0.67 MPa. The comparison of numerical simulation and thermal simulation result shows that under the current continuous casting conditions, the risk of hot tearing in the center of bloom is high, and hot tearing is easily formed and propagated. This study also provides a new way of the assessment for hot tearing risk of continuous castings.

Key words： continuous casting hot tearing thermal simulation numerical simulation strain rate

收稿日期: 2023-01-12

基金资助:国家自然科学基金资助项目(52171039); 河北省重点研发计划资助项目(20311006D)

通讯作者: 仲红刚(1984—), 男, 博士, 副研究员; E-mail: hgzhong@shu.edu.cn

作者简介: 陈美成(1997—), 男, 硕士生; E-mail: chenmc@shu.edu.cn

引用本文:

陈美成, 赵宇, 郭庆涛, 林增煌, 仲红刚, 翟启杰. 42CrMo钢圆坯芯部热裂形成条件热模拟[J]. 中国冶金, 2023, 33(6): 65-72. CHEN Meicheng, ZHAO Yu, GUO Qingtao, LIN Zenghuang, ZHONG Honggang, ZHAI Qijie. Thermal simulation of hot tearing formation conditions in center of 42CrMo steel round bloom[J]. China Metallurgy, 2023, 33(6): 65-72.

链接本文:

http://www.zgyj.ac.cn/CN/10.13228/j.boyuan.issn1006-9356.20230020 或 http://www.zgyj.ac.cn/CN/Y2023/V33/I6/65

[1]	文超,董雯,梁会雷,等. 42CrMo钢的等温淬火和回火[J]. 金属热处理,2014,39(12):50.
[2]	邢嘉倪,蔡欣,郑雷刚,等. 淬火及回火温度对新型中碳合金钢42CrMo4M组织性能的影响[J]. 材料热处理学报,2022,43(5):124.
[3]	QUAN G,LI G,CHEN T,et al. Dynamic recrystallization kinetics of 42CrMo steel during compression at different temperatures and strain rates[J]. Materials Science and Engineering A,2011,528(13):4643.
[4]	唐泽浩,张群莉,黄华,等. 42CrMo钢激光-感应复合淬火淬硬层几何特征及组织[J]. 稀有金属材料与工程,2022,51(7):2519.
[5]	LU Y,ZHU Z,LI D,et al. Constitutive model of 42CrMo steel under a wide range of strain rates based on crystal plasticity theory[J]. Materials Science and Engineering A,2017,679:215.
[6]	刘雅政,黄斌,蒋波,等. 盾构机轴承用钢的开发与质量控制[J]. 钢铁,2014,49(5):1.
[7]	HUANG W,ZHONG H,LEI L,et al. Microstructure and mechanical properties of multi-pass forged and annealed 42CrMo steel[J]. Materials Science and Engineering A,2022,831:142191.
[8]	SAVEIKO V N. Theory of hot tearing[J]. Russian Castings Production,1961,11:453.
[9]	BORLAND J C. Fundamentals of solidification cracking in welds. Pt. 1[J]. Welding and Metal Fabrication,1979,47(1):19.
[10]	LAHAIE D J,BOUCHARD M. Physical modeling of the deformation mechanisms of semisolid bodies and a mechanical criterion for hot tearing[J]. Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science,2001,32(4):697.
[11]	MONROE C,BECKERMANN C. Development of a hot tear indicator for steel castings[J]. Materials Science and Engineering A,2005,413:30.
[12]	RAPPAZ M,DREZET J M,GREMAUD M. A new hot-tearing criterion[J]. Metallurgical and Materials Transactions A,1999,30(2):449.
[13]	SUYITNO,KOOL W H,KATGERMAN L. Hot tearing criteria evaluation for direct-chill casting of an Al-4.5 pct Cu alloy[J]. Metallurgical and Materials Transactions A,2005,36(6):1537.
[14]	秦勤,王文智,张升,等. 连铸轻压下过程极限压下量及工艺参数分析[J]. 中国机械工程,2022,33(16):1972.
[15]	黄诚,李晓谦,陈平虎,等. 宽厚板坯连铸结晶器流场、温度场及应力场的耦合数值模拟[J]. 工程科学学报,2016,38(8):1098.
[16]	赵子豪,魏晶晶,蔡来强,等. 连铸坯实测反问题热弹黏塑性建模与分析[J]. 中国冶金,2021,31(12):39.
[17]	FARUP I,DREZET J M,RAPPAZ M. In situ observation of hot tearing formation in succinonitrile-acetone[J]. Acta Materialia,2001,49(7):1261.
[18]	CAO G,KOU S. Hot cracking of binary Mg-Al alloy castings[J]. Materials Science and Engineering A,2006,417(1):230.
[19]	GUNDE P,SCHIFFL A,UGGOWITZER P J. Influence of yttrium additions on the hot tearing susceptibility of magnesium-zinc alloys[J]. Materials Science and Engineering A,2010,527(26):7074.
[20]	魏晓伟,曾明. 稀土对铸造铝铜合金流动性和热裂倾向性的影响[J]. 铸造技术,1997(3):46.
[21]	仲红刚,王人杰,翟启杰. 冶金凝固过程试验研究方法及应用[J]. 钢铁,2022,57(10):19.
[22]	ZHONG H,WANG R,HAN Q,et al. Solidification structure and central segregation of 6Cr13Mo stainless steel under simulated continuous casting conditions[J]. Journal of Materials Research and Technology,2022,20:3408.
[23]	袁华志,仲红刚,翟启杰. 连铸凝固过程热模拟实验方法及应用案例[J]. 过程工程学报,2022,22(10):1400.
[24]	肖炯,项君良,徐国栋,等. 0.1%C低碳钢连铸坯表层微观组织演变过程热模拟研究[J/OL]. 钢铁研究学报. https://doi.org/10.13228/j.boyuan.issn1001-0963.20220100.
[25]	秦汉伟,肖炯,王迎春,等. 冷却条件对EH40钢板坯表层奥氏体晶粒长大的影响[J]. 中国冶金,2022,32(11):65.
[26]	ZHONG H,CHEN X,LIU Y,et al. Influences of superheat and cooling intensity on macrostructure and macrosegregation of duplex stainless steel studied by thermal simulation[J]. Journal of Iron and Steel Research International,2021,28(9):1125.
[27]	仲红刚,李曦皓,王彪,等. 一种原位加热的热裂纹测试装置:中国,CN201810964742.4[P]. 2020-03-06[2023-01-11]. https://kns.cnki.net/kcms/detail/detail.aspx?dbcode=SCPD&dbname=SCPD202001&filename=CN108931421B.
[28]	OKSMAN P,YU S,KYTÖNEN H,et al. The effective thermal conductivity method in continuous casting of steel[J]. Acta Polytechnica Hungarica,2014,11(9):6.
[29]	LIU S,BAI L,WANG B,et al. Numerical simulations of solidification and hot tearing for continuous casting of duplex stainless steel[J]. Journal of Iron and Steel Research International,2020,27(6):643.
[30]	NOZAKI T,MATSUNO J,MURATA K,et al. A secondary cooling pattern for preventing surface cracks of continuous casting slab[J]. Transactions of the Iron and Steel Institute of Japan,1978,18(6):330.
[31]	ZHANG J,CHEN D,ZHANG C,et al. Effects of an even secondary cooling mode on the temperature and stress fields of round billet continuous casting steel[J]. Journal of Materials Processing Technology,2015,222:315.
[32]	GUO L,TIAN Y,YAO M,et al. Temperature distribution and dynamic control of secondary cooling in slab continuous casting[J]. International Journal of Minerals,Metallurgy and Materials,2009,16(6):626.
[33]	SUYITNO,KOOL W H,KATGERMAN L. Integrated approach for prediction of hot tearing[J]. Metallurgical and Materials Transactions A,2009,40(10):2388.
[34]	牛山廷,张兴中,干勇. 连铸板坯表面横裂纹形成机理及防止措施[J]. 特殊钢,2011,32(1):19.
[35]	魏民,李海洋,董延楠,等. 连铸高铝氮积齿轮钢第三脆性区形成机制与控制[J]. 中国冶金,2022,32(9):64.
[36]	满媛,李宪奎,杨拉道. 曲梁理论在矫直应变计算中的应用[J]. 钢铁研究学报,2009,21(1):17.
[37]	张洪才,印传磊,郑力宁,等. 浸入式水口结构对连铸大圆坯质量的影响[J]. 中国冶金,2022,32(9):57.
[38]	牛亮,赵俊学,仇圣桃,等. 偏心M-EMS作用下连铸圆坯流动-传热模拟[J]. 钢铁,2020,55(9):49.
[39]	李莉娟,王郢,翟启杰. 脉冲磁致振荡(PMO)凝固均质化技术在特殊钢中的应用[J]. 钢铁研究学报,2021,33(10):1018.