Effect of Si and Mn Contents on the Microstructure and Mechanical Properties of Ultra-High Strength Press Hardening Steel

doi:10.11900/0412.1961.2017.00487

Acta Metall Sin

2018, Vol. 54

Issue (8): 1105-1112 DOI: 10.11900/0412.1961.2017.00487

Orginal Article

Current Issue | Archive | Adv Search

Effect of Si and Mn Contents on the Microstructure and Mechanical Properties of Ultra-High Strength Press Hardening Steel

Kuanhui HU^1,²(

), Xinping MAO², Guifeng ZHOU^1,², Jing LIU¹, Zhifen WANG²

1 College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Wuhan Branch of Baosteel Central Research Institute (R&D Center of Wuhan Iron & Steel Co., Ltd.),Wuhan 430080, China;

Cite this article:

Kuanhui HU, Xinping MAO, Guifeng ZHOU, Jing LIU, Zhifen WANG. Effect of Si and Mn Contents on the Microstructure and Mechanical Properties of Ultra-High Strength Press Hardening Steel. Acta Metall Sin, 2018, 54(8): 1105-1112.

Download:

HTML

PDF(12866KB)
Export: BibTeX | EndNote (RIS)

Abstract

It is very important to find out the mechanism of composition in steel. Many efforts have been put on the study of the effect of Si and Mn elements on the microstructure and mechanical properties of middle Mn steel, transformation induced plasticity (TRIP) steel and quenching and partitioning (Q&P) steel. But fewer studies were focused on the mechanism of Si and Mn contents in a press hardening steel. In this work, the microstructures after hot rolled and the fine martensite structure after hot stamping in ultra-high strength press hardening steel (PHS) with different Si and Mn contents were studied by OM, SEM, EBSD and TEM. The results showed that there are a great influence of Si and Mn contents on the microstructure and mechanical properties of PHS after hot rolled. The yield strength of the PHS increases from 552 MPa to 751 MPa, the ultimate tensile strength (UTS) increases from 757 MPa to 1124 MPa, and the microstructures are different with the Mn content rose from 0.57% to 1.21% and the other components remained the same. The UTS of the steels goes up as the Si content goes up from 0.25% to 0.38%, and the yield strength and the elongation show a fluctuation trend. After simulating hot stamping process at 950 ℃ and holding 5 min, the microstructure of the steels with different compositions is martensite, but it is different in the fine martensite structure and the average size of sub-grain; after hot stamping process, the comprehensive mechanical properties of the steel B with 0.30%C, 0.34%Si and 1.21%Mn are the most outstanding, the yield strength is 1161 MPa, the UTS is 1758 MPa, and the elongation is 6.5%; after hot stamping process, the microstructure of the steel B is fine lath martensite, and there is a large amount of dislocation in the martensite lath, and precipitates a small number of carbide. The mechanical properties of the ultra-high strength press hardening steels designed in this work is not obvious correlation before and after hot stamping process, and it is just a slight difference in martensite fine structure which is beneficial to controlling the performance stability of the mass industrial production.

Key words: press hardening steel martensite undercooling austenite ultra-high strength

Received: 20 November 2017

ZTFLH:

TG142

	Service

	E-mail this article
	Add to citation manager
	E-mail Alert
	RSS
	（）
	Articles by authors
	Kuanhui HU
	Xinping MAO
	Guifeng ZHOU
	Jing LIU
	Zhifen WANG

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00487 OR https://www.ams.org.cn/EN/Y2018/V54/I8/1105

Table 1 Chemical compositions of the steels (mass fraction / %)

Fig.1 OM images of the steels A (a), B (b), C (c) and D (d) after finishing rolled at 870 ℃ (B—bainite, F—ferrite, P—pearlite, M—martensite)

Table 2 Mechanical properties of the steels before and after heat treatment

Fig.2 OM images of the steels A (a), B (b), C (c) and D (d) after heat treatment (950 ℃ for 5 min and oil quenching)

Fig.3 SEM images of the steels A (a), B (b), C (c) and D (d) after heat treatment

Fig.4 EBSD images of the steels A (a), B (b), C (c) and D (d) after heat treatment

Fig.5 TEM images of the steels A (a), B (b), C (c) and D (d) after heat treatment

[1]	Naderi M, Durrenberger L, Molinari A, et al.Constitutive relationships for 22MnB5 boron steel deformed isothermally at high temperatures[J]. Mater. Sci. Eng., 2008, A478: 130
[2]	Merklein M, Lechler J, Geiger M.Characterisation of the flow properties of the quenchenable ultra high strength steel 22MnB5[J]. CIRP Ann., 2006, 55: 229
[3]	Turetta A, Bruschi S, Ghiotti A.Investigation of 22MnB5 formability in hot stamping operations[J]. J. Mater. Process. Technol., 2006, 177: 396
[4]	Xing Z W, Bao J, Yang Y Y.Numerical simulation of hot stamping of quenchable boron steel[J]. Mater. Sci. Eng., 2009, A499: 28
[5]	Min J Y, Lin J P, Li J Y, et al.Investigation on hot forming limits of high strength steel 22MnB5[J]. Comput. Mater. Sci., 2010, 49: 326
[6]	Liu H S, Liu W, Bao J, et al.Numerical and experimental investigation into hot forming of ultra high strength steel sheet[J]. J. Mater. Eng. Perform., 2011, 20: 1
[7]	Naderi M, Ketabchi M, Abbasi M, et al.Analysis of microstructure and mechanical properties of different boron and non-boron alloyed steels after being hot stamped[J]. Procedia Eng., 2011, 10: 460
[8]	Li H Z, Wu X, Li G Y.Prediction of forming limit diagrams for 22MnB5 in hot stamping process[J]. J. Mater. Eng. Perform., 2013, 22: 2131
[9]	Liu H S, Lei C X, Xing Z W.Cooling system of hot stamping of quenchable steel BR1500HS: Optimization and manufacturing methods[J]. Int. J. Adv. Manuf. Technol., 2013, 69: 211
[10]	Wang X N, Ma F W, Liu Q, et al.Research on holding pressure and cooling process during hot forming of ultra-high strength steel 22MnB5 [A]. Proceedings of the FISITA 2012 World Automotive Congress[C]. Berlin: Springer-Verlag, 2013: 123
[11]	Li F F, Fu M W, Lin J P, et al.Experimental and theoretical study on the hot forming limit of 22MnB5 steel[J]. Int. J. Adv. Manuf. Technol., 2014, 71: 297
[12]	Shi D Y, Hu P, Ying L.Comparative study of ductile fracture prediction of 22MnB5 steel in hot stamping process[J]. Int. J. Adv. Manuf. Technol., 2016, 84: 895
[13]	Min J Y, Lin J P, Min Y A, et al.On the ferrite and bainite transformation in isothermally deformed 22MnB5 steels[J]. Mater. Sci. Eng., 2012, A550: 375
[14]	So H, Fa?mann D, Hoffmann H, et al.An investigation of the blanking process of the quenchable boron alloyed steel 22MnB5 before and after hot stamping process[J]. J. Mater. Process. Technol., 2012, 212: 437
[15]	Karbasian H, Tekkaya A E.A review on hot stamping[J]. J. Mater. Process. Technol., 2010, 210: 2103
[16]	Venturato G, Novella M, Bruschi S.Effects of phase transformation in hot stamping of 22MnB5 high strength steel[J]. Procedia Eng., 2017, 183: 316
[17]	Mori K, Bariani P F, Behrens B A, et al.Hot stamping of ultra-high strength steel parts[J]. CIRP Ann., 2017, 66: 755
[18]	Lu J, Song Y L, Hua L, et al.Influence of thermal deformation conditions on the microstructure and mechanical properties of boron steel[J]. Mater. Sci. Eng., 2017, A701: 328
[19]	Zhao Z Z, Tong T T, Zhao A M, et al.Effect of Mn and Si on the microstructure and mechanical properties of medium manganese hot-rolled high-strength steel[J]. J. Univ. Sci. Technol. Beijing, 2014, 36(suppl.1): 133(赵征志, 佟婷婷, 赵爱民等. Mn和Si对中锰热轧高强钢组织和性能的影响[J]. 北京科技大学学报, 2014, 36(增刊): 133)
[20]	Li L F, Yang W Y, Sun Z Q.Influence of Mn content on dynamic recrystallization of ferrite in low carbon steels[J]. Acta Metall. Sin., 2004, 40: 1257(李龙飞, 杨王玥, 孙祖庆. Mn含量对低碳钢中铁素体动态再结晶的影响[J]. 金属学报, 2004, 40: 1257)
[21]	Li Z D, Miyamoto G, Yang Z G, et al.Effects of Mn and Si additions on pearlite-austenite phase transformation in Fe-0.6C steel[J]. Acta Metall. Sin., 2010, 46: 1066(李昭东, 宫本五郎, 杨志刚等. Mn 和Si对Fe-0.6C钢中珠光体-奥氏体相变的影响[J]. 金属学报, 2010, 46: 1066)
[22]	Yin H X, Zhao A M, Zhao Z Z, et al.Effects of Mn content on microstructure and mechanical properties of a low carbon medium-manganese TRIP steel[J]. Mater. Sci. Technol., 2014, 22(3): 11(尹鸿祥, 赵爱民, 赵征志等. Mn含量对低碳中锰TRIP钢组织性能的影响[J]. 材料科学与工艺, 2014, 22(3): 11)
[23]	Chen L S, Zhang J Y, Tian Y Q, et al.Effects of Mn partitioning on microstructure and mechanical properties of low-carbon Q&P steel[J]. Heat Treat. Met., 2015, 40(9): 130(陈连生, 张健杨, 田亚强等. Mn配分行为对低碳高强Q&P钢组织与性能的影响[J]. 金属热处理, 2015, 40(9): 130)
[24]	Wang H, Shi W, He Y L, et al.Study of Mn and P solute distributions and their effect on the tensile behavior in ultra low carbon bake hardening steels[J]. Acta Metall. Sin., 2011, 47: 263(王华, 史文, 何燕霖等. Mn和P在超低碳烘烤硬化钢中的分布形态及其对拉伸行为的影响研究[J]. 金属学报, 2011, 47: 263)
[25]	Shi W, Li L, Zhou Y, et al.Effect of Mn content on microstructures and mechanical properties of cold rolled 0.15C-0.6Si-Mn TRIP steels[J]. Heat Treat. Met., 2002, 27(8): 9(史文, 李麟, 周媛等. Mn含量对0.15C-0.6Si-Mn TRIP钢组织和力学性能的影响[J]. 金属热处理, 2002, 27(8): 9)
[26]	Wang L J, Yu W, Wu H B, et al.Effects of Si on tempering stability of retained austenite and mechanical properties of ultra-high strength steels[J]. Trans. Mater. Heat Treat., 2002, 31: 31(王立军, 余伟, 武会宾等. Si对超高强钢残留奥氏体回火稳定性与力学性能的影响[J]. 材料热处理学报, 2010, 31: 31)
[27]	Huang B X, Wang C Z, Wang X D, et al.Effect of nitrogen on martensitic transformation and mechanical properties of TWIP steel[J]. Acta Metall. Sin., 2012, 48: 769(黄宝旭, 王长征, 王晓东等. N对TWIP钢马氏体相变及力学性能的影响[J]. 金属学报, 2012, 48: 769)

[1]	WANG Zhoutou, YUAN Qing, ZHANG Qingxiao, LIU Sheng, XU Guang. Microstructure and Mechanical Properties of a Cold Rolled Gradient Medium-Carbon Martensitic Steel[J]. 金属学报, 2023, 59(6): 821-828.
[2]	ZHANG Kaiyuan, DONG Wenchao, ZHAO Dong, LI Shijian, LU Shanping. Effect of Solid-State Phase Transformation on Stress and Distortion for Fe-Co-Ni Ultra-High Strength Steel Components During Welding and Vacuum Gas Quenching Processes[J]. 金属学报, 2023, 59(12): 1633-1643.
[3]	WANG Chongyang, HAN Shiwei, XIE Feng, HU Long, DENG Dean. Influence of Solid-State Phase Transformation and Softening Effect on Welding Residual Stress of Ultra-High Strength Steel[J]. 金属学报, 2023, 59(12): 1613-1623.
[4]	YANG Lei, ZHAO Fan, JIANG Lei, XIE Jianxin. Development of Composition and Heat Treatment Process of 2000 MPa Grade Spring Steels Assisted by Machine Learning[J]. 金属学报, 2023, 59(11): 1499-1512.
[5]	CHEN Xueshuang, HUANG Xingmin, LIU Junjie, LV Chao, ZHANG Juan. Microstructure Regulation and Strengthening Mechanisms of a Hot-Rolled & Intercritical Annealed Medium-Mn Steel Containing Mn-Segregation Band[J]. 金属学报, 2023, 59(11): 1448-1456.
[6]	HOU Xuru, ZHAO Lin, REN Shubin, PENG Yun, MA Chengyong, TIAN Zhiling. Effect of Heat Input on Microstructure and Mechanical Properties of Marine High Strength Steel Fabricated by Wire Arc Additive Manufacturing[J]. 金属学报, 2023, 59(10): 1311-1323.
[7]	LI Xiaolin, LIU Linxi, LI Yating, YANG Jiawei, DENG Xiangtao, WANG Haifeng. Mechanical Properties and Creep Behavior of MX-Type Precipitates Strengthened Heat Resistant Martensite Steel[J]. 金属学报, 2022, 58(9): 1199-1207.
[8]	ZHU Bin, YANG Lan, LIU Yong, ZHANG Yisheng. Micromechanical Properties of Duplex Microstructure of Martensite/Bainite in Hot Stamping via the Reverse Algorithms in Instrumented Sharp Indentation[J]. 金属学报, 2022, 58(2): 155-164.
[9]	ZHENG Chun, LIU Jiabin, JIANG Laizhu, YANG Cheng, JIANG Meixue. Effect of Tensile Deformation on Microstructure and Corrosion Resistance of High Nitrogen Austenitic Stainless Steels[J]. 金属学报, 2022, 58(2): 193-205.
[10]	SHI Zengmin, LIANG Jingyu, LI Jian, WANG Maoqiu, FANG Zifan. In Situ Analysis of Plastic Deformation of Lath Martensite During Tensile Process[J]. 金属学报, 2021, 57(5): 595-604.
[11]	WANG Yu, HU Bin, LIU Xingyi, ZHANG Hao, ZHANG Haoyun, GUAN Zhiqiang, LUO Haiwen. Influence of Annealing Temperature on Both Mechanical and Damping Properties of Nb-Alloyed High Mn Steel[J]. 金属学报, 2021, 57(12): 1588-1594.
[12]	HAN Baoshuai, WEI Lijun, XU Yanjin, MA Xiaoguang, LIU Yafei, HOU Hongliang. Effect of Pre-Deformation on Microstructure and Mechanical Properties of Ultra-High Strength Al-Zn-Mg-Cu Alloy After Ageing Treatment[J]. 金属学报, 2020, 56(7): 1007-1014.
[13]	LIU Zhenbao,LIANG Jianxiong,SU Jie,WANG Xiaohui,SUN Yongqing,WANG Changjun,YANG Zhiyong. Research and Application Progress in Ultra-HighStrength Stainless Steel[J]. 金属学报, 2020, 56(4): 549-557.
[14]	LUO Haiwen,SHEN Guohui. Progress and Perspective of Ultra-High Strength Steels Having High Toughness[J]. 金属学报, 2020, 56(4): 494-512.
[15]	WANG Shihong,LI Jian,GE Xin,CHAI Feng,LUO Xiaobing,YANG Caifu,SU Hang. Microstructural Evolution and Work Hardening Behavior of Fe-19Mn Alloy Containing Duplex Austenite and ε-Martensite[J]. 金属学报, 2020, 56(3): 311-320.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed