Transactions of Materials and Heat Treatment

Title：Influence of repair effect for internal porosity defects on fatigue performance of heavy forgings

Authors： Liu Qianjun Qiu Yao Xin Ruishan Luo Jianbin Ma Qingxian

Unit： Key Laboratory for Advanced Materials Processing Technology of Ministry of Education Department of Mechanical Engineering Tsinghua University Ansteel Beijing Research Institute Co. Ltd.

KeyWords： heavy forgings forging process porosity defect repair microstructure fatigue strength

ClassificationCode：TG306

year,vol(issue):pagenumber：2022,47(11):16-21

Abstract：

After the internal porosity defects of heavy forgings are forged, the recovery effect of dynamic load mechanical properties such as fatigue strength is one of the important factors determining the quality level of heavy forgings. Therefore, using the simulation experiment of high temperature forging for cylindrical specimen, the effect of microstructure change on the joint surface for internal porosity defects in forgings under different plastic deformation processes and the repair effect of fatigue strength were studied. The results show that although the internal porosity defects basically disappear through only one upsetting, the fatigue properties can only be partially repaired due to the uneven microstructure and small precipitates on the joint surface. By two upsetting and two drawing processes at high temperature, the fatigue strength of joint surface is basically restored to the performance index corresponding to the initial microstructure state. Thus, the research results provide a theoretical basis for formulating a reasonable forging process and ensuring that the mechanical properties such as fatigue after forging are restored to the initial state.

Funds：

国家自然科学基金资助项目（51775298）

作者简介：刘前军（1981-），男，博士研究生，工程师，E-mail：cmiflqj@126.com；通信作者：马庆贤（1964-），男，博士，教授，E-mail：maqxdme@mail.tsinghua.edu.cn

Reference：

[1]Kiedssling R. Non-metallic inclusion in steel[A]. Met. Soc.[C]. London，1978.

[2]Fukumoto S，Mitchell A. The manufacture of alloys with zero oxide inclusion content[A]. Proceedings of the 1991 Vacuum Metallurgy Conference on the Melting and Processing of Specialty Materials I and SS, Inc[C]. Pittsburgh，1991.

[3]李正邦. 超纯净钢和零非金属夹杂钢[J]. 特殊钢，2004,25（4）：24-27.

Li Z B. Super clean steels and zero non-metallic inclusion steels[J]. Special Steels, 2004,25(4):24-27.

[4]Xin R S, Ma Q X, Guo D D, et al. Restoration of impact properties of internal crack healing in a low carbon steel[J]. Materials Science and Engineering A, 2017, 682: 433-440.

[5]Qiu Y, Xin R S， Luo J B, et al. Effect of deformation modes and heat treatment on microstructure and impact property restoration of internal crack healing in SA 508 steel[J]. Materials Science and Engineering A, 2020，778：139073.

[6]Hosoi A, Nagahama T, Ju Y. Fatigue crack healing by a controlled high density electric current field[J]. Materials Science and Engineering A, 2012, 533: 38-42.

[7]李世键, 孙明月，刘宏伟，等. 25Cr2Ni4MoV钢锻造过程孔洞缺陷愈合规律研究[J]. 金属学报，2011, 47（7）：946-953.

Li S J, Sun M Y, Liu H W, et al. Study on void healing behavior during forging process for 25Cr2Ni4MoV steel[J]. Acta Metallurgica Sinica, 2011, 47（7）：946-953.

[8]孙明月，徐斌，夏立军，等. 用于金属构筑成形制造工艺的制造系统[P]. 中国：201610083672.2,2019-09-24.

Sun M Y, Xu B, Xia L J, et al. Manufacturing system for metal structure forming and manufacturing process[P]. China: 201610083672.2,2019-09-24.

[9]王宝忠. 大型锻件的极端制造[J]. 锻造与冲压, 2018,(21):46-50.

Wang B Z. Extreme manufacturing of heavy forgings[J]. Forging & Metalforming，2018, (21): 46-50.

[10]周鹏，信瑞山，邱垚，等. 大型锻件内部孔隙性缺陷变化对冲击性能的影响[J]. 大型铸锻件，2021,（3）：15-18.

Zhou P，Xin R S，Qiu Y，et al. Influence of internal porosity defect variation on impact properties of large forgings[J]. Heavy Castings and Forgings, 2021,（3）:15-18.

[11]Qiu Y, Xin R S, Luo J B, et al. Crack healing and mechanical properties recovery in SA508-3 steel[J]. Materials, 2019, 12（6）：890.

[12]GB/T 15248—2008，金属材料轴向等幅低循环疲劳试验方法[S].

GB/T 15248—2008，The test method for axial loading constant-amplitude low-cycle fatigue of metallic materials[S].

[13]刘哲, 佟振峰, 梁政强. 国产A508-3钢的低周疲劳性能研究[J]. 原子能科学技术, 2014, 48(1): 127-133.

Liu Z, Tong Z F, Liang Z Q. Investigation on low-cycle fatigue property of domestic A508-3 steel[J]. Atomic Energy Science and Technology, 2014, 48(1): 127-133.

[14]陈红宇，杜军毅，邓林涛，等. 核反应堆压力容器锻件用SA508系列钢的比较和分析[J]. 大型铸锻件, 2008,(1): 1-3.

Chen H Y, Du J Y, Deng L T, et al. The comparison and analysis of SA508 series steel used for nuclear reactor pressure vessel forgings[J]. Heavy Castings and Forgings, 2008,(1): 1-3.

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