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

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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

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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"

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