PSI - Issue 36

Valerii Peremitko et al. / Procedia Structural Integrity 36 (2022) 106–113 Valerii Peremitko et al. / Structural Integrity Procedia 00 (2021) 000 – 000

108

3

following values of the weighting factor are introduced: 1. 0 for cracks ≤ 0.10 mm; 1. 15 for cracks ≤ 0.20 mm and 1. 30 for cracks ≤ 0.30. 3. Results and Discussion Table 2 shows the results of determining the chemical composition of the surfaced layers. It should be noted that different series of samples were surfaced to different batches of surfacing materials, even if their brand coincided. This was done intentionally increasing the probability of fluctuations in the content of silicon and aluminum in the surfacing materials of the same brand, but different supply batches. Table 1. The chemical composition of the sample material and pure surfacing determined by the manufacturers (mass%). Brand of material C Mn Si P S Cr Ni Al St3 forDSTU 2651-2006 0.14…0.22 0.4…0.65 0.05…0.17 ≤0.04 ≤0.05 ≤0.25 ≤0.3 - PLAN-T 201 0.45 0.8…1.0 0.5…1.6 ≤0.03 ≤0.03 30 ≤0.25 ≤0.4 Veltek N-630-O 5.4 1.1 0.8…1.0 0.016 0.017 26 0.03 ≤0.15 UTP SK-256-O 5.5 1.1 1.2 ≤0.02 0.025 25.7 ≤0.15 ≤0.04

Table 2. The results of determining the chemical composition of the deposited layers (mass%). Sample batch number / brand of surfacing material C Mn Si P S Cr Ni

Mo

Al

Cu

B

№1/ PLAN-T 201

3.84

0.6

0.94

0.026

0.036

24.79

0.14

0.68

0.34

0.021

-

№2/ PLAN-T 201

3.23

0.46

0.37

0.025

0.029

21.56

0.25

-

0.36

0.022

-

№3/ SK-256- О

4.86

1.14

1.18

0.019

0.025

22.65

0.12

-

0

0.06

-

№4/ Veltek N-630-O

3.56

0.2

0.76

0.02

0.023

21.58

0.03

-

0.12

0.022

0.11

№5/ PLAN-T 201

2.68

0.8

1.57

0.027

0.032

18.2

0.15

-

0.33

0.02

-

№6/ PLAN-T 201

2.95

0.76

0.49

0.027

0.041

20.9

0.23

-

0.34

0.022

-

№7/ Veltek N-630-O

3.09

0.48

0.87

0.022

0.019

18.69

0.031

0.15

0.1

0.028

0.11

№8/ SK-256- О

4.52

1.1

1.07

0.02

0.025

22.34

0.12

-

0

0.017

-

№9/ Veltek N-630-O

3.29

0.49

0.91

0.022

0.02

19.72

0.028

0.16

0.11

0.03

0.12

The relationship between Si and Al content and the hardness of the surfaced metal. Fig. 1-3 show the dependences of the hardness of the cross section of the applied layer; they are maximum HRC max , minimum HRC min and average HRC mid , respectively.