STRENGTH AND TOUGHNESS OF T250 MARAGING STEEL JOINT HYBRID-TREATED WITH LASER WELDING AND AGING

doi:10.11900/0412.1961.2014.00635

Acta Metall Sin

2015, Vol. 51

Issue (8): 904-912 DOI: 10.11900/0412.1961.2014.00635

Current Issue | Archive | Adv Search

STRENGTH AND TOUGHNESS OF T250 MARAGING STEEL JOINT HYBRID-TREATED WITH LASER WELDING AND AGING

Kun LI¹,Jiguo SHAN^1,²(

),Chunxu WANG³,Zhiling TIAN³

1 Laser Processing Research Center, Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2 Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084
3 Institute for Special Steel, Central Iron & Steel Research Institute, Beijing 100081

Cite this article:

Kun LI,Jiguo SHAN,Chunxu WANG,Zhiling TIAN. STRENGTH AND TOUGHNESS OF T250 MARAGING STEEL JOINT HYBRID-TREATED WITH LASER WELDING AND AGING. Acta Metall Sin, 2015, 51(8): 904-912.

Download:

HTML

PDF(12993KB)
Export: BibTeX | EndNote (RIS)

Abstract

Maraging steels are leading members of the ultra-high strength steel family due to a combination of two solid state reactions: martensitic transformation and subsequent ageing. These steels can be hardened by the precipitation of refined Ni₃(Ti, Mo) intermetallic particles. They have been widely used in the military and aerospace applications such as solid rocket motor cases and submarine shells due to their high strength and toughness. The T250 maraging steel has used Ti as one of the primary strengthening elements to replace Co, which decreases the cost of maraging steels. Its properties are comparable to the standard Co-bearing grades in the 1.4~2.1 GPa strength levels. It possesses good weldability without porosity in the weld and other weld defects. However, the combination of strength and toughness of welded joints is the main problem which has not been solved well via different welding methods so far. In this work, T250 maraging steel plate with 2 mm thickness was hybrid-treated with laser welding and aging treatment. The strength and toughness of welded joints aged before and after welding were investigated. The microstructures of parent metals and welded joints were observed with OM and SEM. Chemical compositions in parent metals and weld zones were analyzed with EPMA. The tensile strength and static toughness were acquired with the auxiliary device of Gleeble machine and could represent strength and toughness of the welded joints. The results show that the tensile strength and static toughness of the welded joint aged before welding are 62% and 28% that of the aged parent metal, respectively. However, the tensile strength and static toughness of the welded joint aged after welding reach 98% and 71% that of the aged parent metal, respectively. The weld metal is the key zone to influence the strength and toughness of the welded joints. Ni₃(Ti, Mo) precipitates in the weld metal are the intrinsic reason resulting in that the strength and toughness of the welded joint aged after welding are superior to that of the welded joint aged before welding. Ni₃(Ti, Mo) precipitates are beneficial to the strength and static toughness in the elastic deformation stage, and it has a dual effect on the static toughness in the plastic deformation stage of the welded joints. The reverted austenite has a negligible effect on the strength and static toughness in the elastic deformation stage, while it is detrimental to the static toughness in the plastic deformation stage of the welded joints.

Key words: T250 maraging steel laser welded joint strength and toughness welding and aging static toughness Ni₃(Ti,Mo) particle reverted austenite

	Service

	E-mail this article
	Add to citation manager
	E-mail Alert
	RSS
	（）
	Articles by authors
	Kun LI
	Jiguo SHAN
	Chunxu WANG
	Zhiling TIAN

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00635 OR https://www.ams.org.cn/EN/Y2015/V51/I8/904

Fig.1 Schematic diagram of laser welding

Fig.2 Dimension of tensile specimen (unit: mm)

Table 1 Tensile strength and static toughness of parent metals and welded joints hybrid-treated with welding and aging

Fig.3 OM images of as-received parent metal (a), aged parent metal (b), welded joint aged before welding (c), welded joint without aging (d) and welded joint aged after welding (e)

Fig.4 SEM images of as-received parent metal (a, b), aged parent metal (c, d), welded joint aged before welding (e, f), welded joint without aging (g, h) and welded joint aged after welding (i, j) at low (a, c, e, g, i) and high (b, d, f, h, j) magnification

Fig.5 BSE images of Ni (a), Mo (b) and Ti (c) in welded joint aged after welding

Table 2 EPMA analysis of chemical compositions in parent metals and welded joints hybrid-treated with welding and aging

Fig.6 OM images of cross sections of welded joints aged before (a) and after (b) welding (BM—base metal, WM—weld metal, PMZ—partial melted zone, DER—deep erosion region)

Fig.7 Microhardness of welded joints hybrid-treated with welding and aging (HAZ—heat affected zone)

Fig.8 SEM images of PMZ (a, c) and DER (b, d) in welded joints aged before (a, b) and after (c, d) welding

Fig.9 SEM images of fractures in as-received parent metal (a), aged parent metal (b), welded joint aged before welding (c) and welded joint aged after welding (d)

[1]	Decker R F, Floreens S. In: Wilson R K ed., Maraging Steels: Recent Developments and Applications, Huntington, West Virginia: The Minerals, Metals & Materials Society, 1988: 1
[2]	Liang D M, Zhu Y Z, Liu G H. Heat Treat Met, 2010; 35(12): 34 (梁冬梅, 朱远志, 刘光辉. 金属热处理, 2010; 35(12): 34)
[3]	Jiang Y, Yin Z D. Mater Sci Technol, 2004; 12(1): 108 (姜越, 尹钟大. 材料科学与工艺, 2004; 12(1): 108)
[4]	He Y, Yang K, Kong F Y, Qu W S, Su G Y. Acta Metall Sin, 2002; 38: 278 (何毅, 杨柯, 孔凡亚, 曲文生, 苏国跃. 金属学报, 2002; 38: 278)
[5]	Vasudevan V K, Kim S J, Wayman C M. Metall Mater Trans, 1995; 21A: 2655
[6]	Fan Z B, Han D, Duan S C. Aerosp Technol, 2010; 10(5): 41 (范赵斌, 韩冬, 段述苍. 航空航天技术, 2010; 10(5): 41)
[7]	Tsay L W, Huang W B, Chen C. J Mater Eng Perform, 1997; 6(2): 182
[8]	Sundaresan S, Manirajan M, Nageswara R B. Mater Des, 2010; 31: 4921
[9]	Subhananda R A, Venkata R G, Nageswara R B. Eng Failure Anal, 2005; 12: 325
[10]	Floreen D S, Bayer A M. In: Wilson R K ed., Maraging Steels: Recent Developments and Applications, Huntington, West Virginia: The Minerals, Metals & Materials Society, 1988: 39
[11]	Shamantha C R, Narayanan R, Iyer K J L, Radhakrishnan V M, Seshadri S K, Sundararajan S, Sundaresan S. Sci Technol Weld Joining, 2000; 5: 329
[12]	Gupta R, Reddy R, Mukherjee M K. Weld World, 2012; 56(9): 69
[13]	Mo D F, He G Q, Hu Z F, Shi Y L, Zhang W H. Trans China Weld Inst, 2008; 29(4): 29 (莫德锋, 何国求, 胡正飞, 施延龄, 张卫华. 焊接学报, 2008; 29(4): 29)
[14]	Lee Y J, Lee I K, Wu S C, Kung M C, Chou C P. Sci Technol Weld Joining, 2007; 12: 266
[15]	Reddy G M, Rao V V, Raju A V S. J Mater, 2013; 223(4): 149
[16]	Tsay L W, Chen C, Chan S L I. Int J Mater Prod Technol, 1995; 10(1-2): 132
[17]	Fanton B L, Abdalla A J, Fernandes M S. Weld J, 2014; 93: 362
[18]	Zhao Z Y. The Design of Alloy Steels. Beijing: National Defense Industry Press, 1999: 64 (赵振业. 合金钢设计. 北京: 国防工业出版社, 1999: 64)
[19]	Zhang L Y, Yang G, Huang C X, Chen W L, Wang L M. Acta Metall Sin, 2008; 44: 409 (张凌义, 杨钢, 黄崇湘, 陈为亮, 王立明. 金属学报, 2008; 44: 409)
[20]	Zhang Z M, Zhang X, Wang Q, Li B C. J Mech Eng, 2012; 48(18): 67 (张治民, 张星, 王强, 李保成. 机械工程学报, 2012; 48(18): 67)
[21]	Lu L, Li Z B, Bi Z Y, Xue L H, Ma X. J Iron Steel Res, 2014; 26(6): 67 (芦琳, 李周波, 毕宗岳, 薛磊红, 马璇. 钢铁研究学报, 2014; 26(6): 67)
[22]	Yin Z D, Li X D, Li H B, Lai Z H. Acta Metall Sin, 1995; 43: 7 (尹钟大, 李晓东, 李海滨, 来忠红. 金属学报, 1995; 43: 7)
[23]	Tsay L W, Lee W C, Luu W C, Wu J K. Corros Sci, 2002; 44: 1311
[24]	Ye H Q, Zou B S. Acta Metall Sin, 1979; 15: 69 (叶恒强, 邹本三. 金属学报, 1979; 15: 69)
[25]	Kenyon N. Weld J, 1968; 47(5): 193
[26]	Narayanan P R, Sreekumar K, Natarajan A, Sinha P P. J Mater Sci, 1990; 25: 4587

[1]	WANG Bin, NIU Mengchao, WANG Wei, JIANG Tao, LUAN Junhua, YANG Ke. Microstructure and Strength-Toughness of a Cu-Contained Maraging Stainless Steel[J]. 金属学报, 2023, 59(5): 636-646.
[2]	LI Wei, JIA Xingqi, JIN Xuejun. Research Progress of Microstructure Control and Strengthening Mechanism of QPT Process Advanced Steel with High Strength and Toughness[J]. 金属学报, 2022, 58(4): 444-456.
[3]	LI Xueda, LI Chunyu, CAO Ning, LIN Xueqiang, SUN Jianbo. Crystallography of Reverted Austenite in the Intercritically Reheated Coarse-Grained Heat-Affected Zone of High Strength Pipeline Steel[J]. 金属学报, 2021, 57(8): 967-976.
[4]	YANG Rui, MA Yingjie, LEI Jiafeng, HU Qingmiao, HUANG Sensen. Toughening High Strength Titanium Alloys Through Fine Tuning Phase Composition and Refining Microstructure[J]. 金属学报, 2021, 57(11): 1455-1470.
[5]	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.
[6]	Ke YANG, Mengchao U, Jialong AN, Wei NG. Research and Development of Maraging Stainless Steel Used for New Generation Landing Gear[J]. 金属学报, 2018, 54(11): 1567-1585.
[7]	Changjun WANG,Jianxiong LIANG,Zhenbao LIU,Zhiyong YANG,Xinjun SUN,Qilong YONG. EFFECT OF METASTABLE AUSTENITE ON MECHANI-CAL PROPERTY AND MECHANISM IN CRYOGENICSTEEL APPLIED IN OCEANEERING[J]. 金属学报, 2016, 52(4): 385-393.
[8]	Tongbang AN,Zhiling TIAN,Jiguo SHAN,Jinshan WEI. EFFECT OF SHIELDING GAS ON MICROSTRUCTURE AND PERFORMANCE OF 1000 MPa GRADE DEPOSITED METALS[J]. 金属学报, 2015, 51(12): 1489-1499.
[9]	. High strength and high toughness heat-resistant martensitic steel produced by ECAP[J]. 金属学报, 2008, 44(4): 409-413 .
[10]	. Impact properties of Al-Cu alloy subjected to equal channel angular pressing[J]. 金属学报, 2007, 43(12): 1251-1255 .

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed