(. . 2.3). , ,
σ N (. 12.7). , : .
σqN= const,
. 12.7. |
const , ( , .).
: , , N NK, , . Na
. NK>NG, σlim .
( ), ; σlim, NG, q.
[σ]H1 [σ]H2 (), :
(12.10)
, . 12.7 H, .
12.7. σ Hlim, NHG
- | Hcp | σ Hlim, /- | |
< 350 40...56 HRC | 2 + 70 17 + 200 | ||
56...65HRC 52...62 HRC | 23 1050 |
ZN, ,
(12.11)
ZNmax = 2,6 (, , -) ZNmax =l,8 - ( , , ).
NHG, σ Hlim (. . 12.7), (. 12.8).
NHE (12.1), (12.2).
( ) NHE> NHG , , ZN=l, -
12.8. NHG,
HRC | <200 | 250 27 | 300 33 | 350 39 | 400 43 | 450 48 | 500 53 | 550 56 | 600 60 |
NHG | 16,5 | 36,4 |
(12.11). .
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ZR, , Ra (. 5.2):
ZR-i Ra = 0,63...1,25 ;
Zfi = 0,95 Ra- 1,25...2,5 ;
Z = 0,90 Ra = 2,50... 10 .
Zv, , . 12.9.
12.9. Z,
1 | Zv v, / | |||
< 350 > 45 HRC | 1,0 1,0 | 1,065 1,035 | 1.11 1,06 | 1,150 1,075 |
[s],/ (, , -) 1,1; [s]H=l,2.
[σ], , [σ]H1 [σ]2.
[σ]F1 [σ]F2 (), ( ) ( ) :
(12.13)
[σ]Flim . 12.10 , .
: qF=6 (YNmx = 4), qF=9 (YNmix = 2,5).
, (. . 12.7), NFG = 4-106. NFE (12.1), (12.2). YN=l.
YR, , : YR= 1 - Rz<40 ; YR= 1,05...1,2 ( ).
YA (). YR, =1,0 ; } YR, = 0,7...0,8 .
[s]F= 1,7. ( ) [s]F= 1,55. [s\F = 2,2.
12.10. σFlim, NFC
[σ]Flim, /3 | ||||
45, 35, 40, 40 | 180...350 | 180...350 | 1,75 , | |
40, 40, 35 | ( > 3 ) | 48...53 HRC | 27...35HRC | 600...700 |
40, 40, 35 | , ( < 3 ) | 48...53HRC | 48...53HRC | 5 00... 600 |
40 | 50...67HRC | 24...40 HRC | 12#+290* | |
20, 20, 18 | 56...63HRC | 30...45HRC | 850...950 |
* .
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