Abstract
A comparative study of structural features of the blade castings having a single-crystal structure and made of heat-resistant carbon-free and carbon-containing high-temperature nickel alloys upon directional crystallization with 001 crystallographic orientation is carried out. The results of the effect of directional crystallization modes on the formation of the structure and defects of castings of working blades made of carbon-containing and carbon-free high-temperature nickel alloys are presented. Changes in the degree of pickling of the near-surface layer of casting are presented as a function of pickling conditions. The microstructure of the near-surface zone of castings made of ZhS32 heat-resistant alloy is studied after different modes of their technological processing. It is shown that blade castings with a single-crystal structure made of heat-resistant carbon-free superalloys have a tendency to formation of the block structure and appearance of surface recrystallized grains. Recommendations on the use of methods of nondestructive X-ray control of blades made of carbon-frees alloys and precautions regarding birth of microporosity on the shelf and in the blade lock are specified.
Highlights
Ïðåäñòàâëåíû ðåçóëüòàòû ñðàâíèòåëüíîãî èññëåäîâàíèÿ ñòðóêòóðíûõ îñîáåííîñòåé îòëèâîê òóðáèííûõ ëîïàòîê ñ ìîíîêðèñòàëëè÷åñêîé ñòðóêòóðîé èç æàðîïðî÷íûõ áåçóãëåðîäèñòûõ è óãëåðîäñîäåæàùèõ æàðîïðî÷íûõ íèêåëåâûõ ñïëàâîâ ñ êðèñòàëëîãðàôè÷åñêîé îðèåíòàöèåé á001ñ
Changes in the degree of pickling of the near-surface layer of casting are presented as a function of pickling conditions
The microstructure of the near-surface zone of castings made of ZhS32 heat-resistant alloy is studied after different modes of their technological processing
Summary
ÎÑÎÁÅÍÍÎÑÒÈ ÌÎÍÎÊÐÈÑÒÀËËÈ×ÅÑÊÎÉ ÑÒÐÓÊÒÓÐÛ ÒÓÐÁÈÍÍÛÕ ËÎÏÀÒÎÊ ÈÇ ÁÅÇÓÃËÅÐÎÄÈÑÒÛÕ È ÓÃËÅÐÎÄÑÎÄÅÆÀÙÈÕ ÆÀÐÎÏÐÎ×ÍÛÕ ÍÈÊÅËÅÂÛÕ ÑÏËÀÂÎÂ* Ïðåäñòàâëåíû ðåçóëüòàòû ñðàâíèòåëüíîãî èññëåäîâàíèÿ ñòðóêòóðíûõ îñîáåííîñòåé îòëèâîê òóðáèííûõ ëîïàòîê ñ ìîíîêðèñòàëëè÷åñêîé ñòðóêòóðîé èç æàðîïðî÷íûõ áåçóãëåðîäèñòûõ è óãëåðîäñîäåæàùèõ æàðîïðî÷íûõ íèêåëåâûõ ñïëàâîâ ñ êðèñòàëëîãðàôè÷åñêîé îðèåíòàöèåé á001ñ. Àíàëèç ìèêðîñòðóêòóðû ïðèïîâåðõíîñòíîé çîíû îòëèâîê ïîñëå ðàçëè÷íûõ òåõíîëîãè÷åñêèõ ïðîöåññîâ ïîêàçàë, ÷òî ëîïàòêè èç æàðîïðî÷íûõ áåçóãëåðîäèñòûõ ñïëàâîâ ñêëîííû ê îáðàçîâàíèþ áëî÷íîé ñòðóêòóðû è ïîÿâëåíèþ ïîâåðõíîñòíûõ ðåêðèñòàëëèçîâàííûõ çåðåí.
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