SU739131A1 - Method of nitriding structural steel parts - Google Patents

Method of nitriding structural steel parts Download PDF

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Publication number
SU739131A1
SU739131A1 SU782659232A SU2659232A SU739131A1 SU 739131 A1 SU739131 A1 SU 739131A1 SU 782659232 A SU782659232 A SU 782659232A SU 2659232 A SU2659232 A SU 2659232A SU 739131 A1 SU739131 A1 SU 739131A1
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SU
USSR - Soviet Union
Prior art keywords
nitriding
saturation
structural steel
layer
steel parts
Prior art date
Application number
SU782659232A
Other languages
Russian (ru)
Inventor
Вячеслав Алексеевич Бойков
Валентин Васильевич Никитин
Лев Кимович Гордиенко
Original Assignee
Всесоюзный Научно-Исследовательский Институт Резинотехнического Машиностроения
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Priority to SU782659232A priority Critical patent/SU739131A1/en
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Publication of SU739131A1 publication Critical patent/SU739131A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Description

(54 Г СПОСОБ АЗОТИРОВАНИЯ ДЕТАЛЕЙ ИЗ КОНСТРУКЦИОННОЙ СТАЛИ Изобретение относитс  к химикотергчической обработке, в частности к газовому азотированию стальных изделий , и может быть использовано в машиностроении дл  деталей, испытывающих динамические нагрузки и износ поверхности. Известен способ газового азотировани  при температуре в течении 9 часов flj. Однако известный способ не дает нужного эффекта упроч нени  . Кроме того, высока  температура процесса способствует повышенно му короблению. Известен также способ, заключающийс  в одноступенчатом газовом азотировании в среде аммиака при температуре 500-520 с в течении 24, 48 часов 2 . Однако существующий способ азотиро вани  характеризуетс  повышенной хруп костью поверхностного сло . Высока  продолжительность процесса приводит к разупрочнению сердцевиных азотированных деталей, что снижает предел вынос ливости. Цель насто щего изобретени  - повы шение физико-механических характеристик азотированного сло ; а именно: увеличение усталостной прочности и износостойкости азотированных стальных изделий, а также интенсификаци  . процесса насыщени . Указанна  цель .достигаетс  за счет. того, что после 2-3 ч азотировани  при TetinepaType насыщени  500-520С провод т охлаждение изделий до температуры 350-370°С, затем вновь нагревают до 500-520°С и азотируют 2-3 ч и циклически повтор ют данную операцию в зависимости от требуемой глубины азотированного сло . При таком способе азотировани  хрупкость сло , по сравнению с имеющимис  способами, значительно снижаетс , так как хрупка  составл юща  сло  в -фаза практически отсутствует, о чем свидетельствует результат рентгеноструктурного и металлографического . Кроме того, повьмаето  твердость сло  за счет увеличени  степени дисперсности выдел ющихс  нитридов, которые не успевают коагулировать ввиду кратковременности процесса. В цел х экономики времени при процессе азотировани  более низкое охлаждение, чем 350-370 0 нецелесообразно. Врем  вьадержки на каждом этапе азотировани  (2-3 ч) выбираетс  дл (54 G METHOD OF NITROGENING DETAILS FROM CONSTRUCTIONAL STEEL However, the known method does not give the desired hardening effect. In addition, the high process temperature contributes to increased distortion. There is also known a method consisting of one step gas nitriding in ammonia at a temperature of 500-520 s for 24, 48 hours 2. However, the existing method of nitriding is characterized by an increased fragility of the surface layer.The high duration of the process leads to the softening of core nitrided parts, which reduces the stamina of extrusion. of the present invention is to increase the physicomechanical characteristics of the nitrided layer, namely: an increase in the fatigue strength and wear resistance of nitrided steel products, as well as the intensification qi. saturation process. This goal is achieved by. after 2-3 hours with TetinepaType saturation of 500-520 ° C, products are cooled to a temperature of 350-370 ° C, then reheated to 500-520 ° C and nitrated for 2-3 hours and this operation is cyclically repeated from the required depth of the nitrated layer. With this method of nitriding, the fragility of the layer, compared with the existing methods, is significantly reduced, since the fragile component of the layer in the α phase is almost absent, as evidenced by the result of X-ray structural and metallographic. In addition, the hardness of the layer is increased due to an increase in the degree of dispersion of released nitrides, which do not have time to coagulate due to the short duration of the process. In terms of the economics of time, the process of nitriding lower cooling than 350-370 0 is impractical. The delay time at each nitriding stage (2-3 hours) is chosen for

® ,.-Жиака ®, .- Zhiak

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л&l &

охлаж f со скоrt jj o е ,,5 VХРад/мин . При   cooling f with speed jj o e ,, 5 VXRad / min. With

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.6ы 350С осущест е 9 до температуры .6ы 350С implementation 9 to temperature

т:ет1енъ диссоциации о вновь азотируют ,с,С-°-цикл многократно повтор  Z t: et1en dissociation o re-nitrate, s, C- °-cycle repeated Z

ЮТ В зависимости от требуемой глубины сло . Глубину азотированного сло  UT Depending on the required depth of the layer. Depth of nitrated layer

. i хше и распределение микротвердости по слою определ ют с помощью микротвердомера ПМТ-3 при нагрузке 50 г. ifeneHbro . ihs and microhardness distribution over the layer is determined using a PMT-3 microhardness meter with a load of 50 g. ifeneHbro

Испытани  на усталость образцов, обработанных по предлагаемому и известному способам, провод т на машине МУИ-6000.Fatigue tests of samples processed by the proposed and known methods are carried out on a MUI-6000 machine.

оabout

Результаты обработки по известному и предлагаемому режимам представлены в таблице.The results of processing according to the known and proposed modes are presented in the table.

ИзвестныйFamous

520 ± 520 ±

Claims (1)

ПредлагаеМ1ЛЙ Как видно из таблицы, предел выносливости образцов, обработанных по предлагаемому способу, увеличива етс  на 10-15% по сравнению с извес ным, а глубина сло  - в 1,5 раза. Формула изобретени  Способ азотировани  деталей из конструкционной стали, включающий нагрев в среде аммиака до тегмпературы обработки, насыщение при этой температуре, отличающий с тем, что, с целью интенсификации пр цесса насыщени  и улучшени  физикоThe table shows that the endurance limit of the samples processed according to the proposed method is increased by 10-15% compared with the known, and the depth of the layer is 1.5 times. The invention The method of nitriding of parts from structural steel, including heating in an ammonia environment to the processing temperature, saturation at this temperature, so that, in order to intensify the saturation process and improve the physical 53,5 53.5 550 550 0,36 55 ,0 0,48 5100.36 55, 0 0.48 510 59,0 59.0 560 560 0,44 60,5 650 0,40 0.44 60.5 650 0.40 12 24 62,5 0,55 610 механическихсвойств, насыщение осуществл ют циклически, причем в каждом цикле выдерживают при 500-520 0 в течение 2-3 ч, затем охлаждают до 350-370 С и вновь нагревают до 500520 С , Источники информации, прин тые во внимание при экспертизе 1/ Металловедение и термическа  обработка металлов, 1974, W 3, с.20-27. 2, Пахтин Ю.М., Коган Я.Д. Азотирование стали, М. , Машиностроение 1976 , с. 115-117.12 24 62.5 0.55 610 mechanical properties, saturation is carried out cyclically, and in each cycle it is maintained at 500-520 0 for 2-3 hours, then cooled to 350-370 ° C and reheated to 500520 ° C. taken into account in the examination of 1 / Metallurgy and thermal processing of metals, 1974, W 3, p.20-27. 2, Pakhtin Yu.M., Kogan Ya.D. Nitriding of steel, M., Mashinostroenie 1976, p. 115-117.
SU782659232A 1978-08-28 1978-08-28 Method of nitriding structural steel parts SU739131A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5658394A (en) * 1994-08-24 1997-08-19 Lindauer Dornier Gesellschaft Mbh Method for increasing the surface hardness of loom components exposed to friction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5658394A (en) * 1994-08-24 1997-08-19 Lindauer Dornier Gesellschaft Mbh Method for increasing the surface hardness of loom components exposed to friction

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