Материаловедение: свойства металлов. Матросова Т.А - 49 стр.

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49
Another useful fact may be mentioned. A gear or a shaft made from a
particular steel may be found to have at some point a Rockwell hardness of C50. A
Jominy hardenability test is then run, and it is found that C50 is 19/16 in. from the
water-cooled end. Any other steel that will show C50 at 19/16 in. from the quenched
end will produce a similar hardness distribution when it is used to make the same
part.
It is known from various sources, that the sizes of bars that are fully
hardenable, that is, that will develop a hardness of at least Rockwell C50 at the center
when quenched, are different. These are interesting figures, particularly when
correlated with steel prices. The 1300 steels are practically as good as 2300 (3.5
percent nickel) or as 5100 chromium steels in the matter of depth of hardening; they
are almost as good as nickel-chromium steels.
Glossary
№ English word Translation
1. hardenability способность к упрочнению
2. specimen образец
3. surface поверхность
4. quenching закалка
5. rate скорость
6. diffusivity способность к диффундированию
7. austenite аустенит
8. grain зерно
9. hot-work обработка вгорячую
10. die штамп
11. bainitic бейнитный
12. plain обычный
13. outside внешний
14. diameter диаметр
15. test испытание
16. bar стержень
17. jet струя
18. bottom face торец
19. cooling охлаждение
20. length длина
21. spray распыление, струя
22. correlate коррелирует
23. gear зубчатое колесо, шестерня
24. shaft вал, ось, шпиндель
25. similar схожий, подобный
26. distribution распределение
27. various различный

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