Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (6): 1301-1307.doi: 10.13229/j.cnki.jdxbgxb20210073

Previous Articles    

Performance of repaired 5Cr5MoV die steel

Yan LIANG1(),Qiang WANG2,Yu-lai SONG1(),Yao-hui LIU1   

  1. 1.College of Materials Science and Engineering,Jilin University,Changchun 130022,China
    2.Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China
  • Received:2021-04-06 Online:2022-06-01 Published:2022-06-02
  • Contact: Yu-lai SONG E-mail:clark7998@163.com;ylsong@jlu.edu.cn

Abstract:

A new round pit repair method was designed to repair 5Cr5MoV cold working die steel. Microstructure in the repaired zone was characterized by scanning electron microscope(SEM), and the microhardness distribution map of the repaired zone was drawn. a new evaluation parameter, fluctuation coefficient (n), for evaluating the repair effect was proposed, based on the maximum hardness, minimum hardness and matrix hardness of the repaired zone. The results show that when the pit diameter is 20 mm, the repair effect is the best.

Key words: materials processing engineering, cold working die steel, 5Cr5MoV, casting defect, round pit repairing method, microhardness, fluctuation coefficient

CLC Number: 

  • TG455

Fig.1

Casting defects on casting die surface"

Fig.2

Sampling position and dimension of round pit repair sample"

Fig.3

Schematic diagram of sample"

Fig.4

Microhardness distribution of the repaired zone"

Fig.5

Microhardness distribution of therepaired zone after annealing"

Table 1

Microhardness characteristics of therepaired round pit"

圆坑直径/mmHVmatrixHVmaxHVminHVmax-HVminn
106007805362440.32
206006505081420.17
306006825131690.20

Table 2

Microhardness characteristics of theround pit after annealing"

圆坑直径/mmHVmatrixHVmaxHVminHVmax-HVminn
10260318246720.23
20260292253390.13
30260301233680.19

Fig.6

Engineering stress-strain curves of the repaired samples after annealing treatment"

Fig.7

Fracture morphology of the tensile samples cut from the repaired plate with the different round pit diameter"

Fig.8

Microstructure of the samples cut from therepaired plate with the different round pit diameter"

Fig.9

Microstructure of the samples cut from therepaired plate after annealing with thedifferent round pit diameter"

1 Aslan E. Experimental investigation of cutting tool performance in high speed cutting of hardened X210 Cr12 cold-work tool steel (62 HRC)[J]. Materials & Design, 2005, 26(1): 21-27.
2 Li S S, Liu Y H, Song Y L, et al. Microstructure, mechanical properties and strengthening mechanisms of 5Cr5MoV modified by aluminum[J]. Materials & Design, 2015, 83: 483-492.
3 Elghazaly S A, Gyula K, Elghazaly W. Optimizing Morphology of primary carbides and mechanical properties during processing of Cast-Cold work AISI D2-Steel press forming dies[J]. International Journal of Metalcasting, 2019, 13: 337-344.
4 Baka T, Kroupa T, Hanzl P, et al. Durability of cutting tools during machining of very hard and solid materials[J]. Procedia Engineering, 2015, 100: 1414-1423.
5 Čamek L, Lich P, Kroupov I, et al. Effect of cast steel production metallurgy on the emergence of casting defects[J]. Metalurgija, 2016, 55(4): 701-704.
6 Sarkar A D. Casting Defects[M]. United States, Pennsylvania: Elsevier Ltd, 1967.
7 Ono K. Non-destructive Testing[M]. Korea: Wiley‐VCH Verlag GmbH & Co., 2000.
8 Mičian M, Koň R R, Hlavat I, et al. The repair of foundry defects in steel castings using welding technology[J]. Archives of Foundry Engineering, 2018, 18(2): 177-180.
9 Tuek J, Kosec L, Lenjak A, et al. Electrospark deposition for die repair[J]. Metalurgija: Sisak then Zagreb, 2012, 51(1): 17-20.
10 Leunda J, Soriano C, Sanz C, et al. Laser cladding of vanadium-carbide tool steels for die repair[J]. Physics Procedia, 2011, 12(A): 345-352.
11 Junkes R, Howarth J L L, Becker D, et al. Properties evaluation of semi-crystalline and amorphous polymers injected in AISI P20 molds repaired by welding[J/OL].[2021-01-05].
12 Gouveia R M, Silva F J, Paiva O C, et al. Study of the heat-treatments effect on high strength ductile cast iron welded joints[J]. Metals, 2017, 7(9): No.382.
13 Jhavar S, Paul C, Jain N. Causes of failure and repairing options for dies and molds: a review[J]. Engineering Failure Analysis, 2013, 34: 519-535.
14 Thompson S. Handbook of Mould, Tool and Die Repair Welding[M]. Abington, England: Abington Publishing, 1999.
15 Peças P, Henriques E, Pereira B, et al. Fostering the use of welding technology in the mould repair[J/OL].[2021-01-15].
16 Tušek J, Taljat B, Klobčar D. How to extend the life of die-casting tools[J]. Metalurgija: Sisak then Zagreb, 2006, 46(1): 67-71.
[1] GUAN Qing-feng, LI Yan, HOU Xiu-li, YANG Sheng-zhi, WANG Xiao-tong. Modification of solid solution Mg-Gd-Y-Nd alloy irradiated by high current pulsed electron beam [J]. 吉林大学学报(工学版), 2015, 45(4): 1200-1205.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!