42 CRMO Ring Billet-a Organizational characteristics Figure 1 chu solidified tissue-a computer numerical simulation chu vertical centrifugal casting-a casting speed 480 RAD/s-a siam a ni a, casting temperature chu 1500℃a ni a, 1000mm casting-a outer diameter, 360mm chhunga diameter leh cast parameters te chu a ni. Figure 4. Figure atanga kan hmuh theih angin annular casting pawn lam bang chu uniform fine isopaxial crystal region a ni. Casting chhungah chuan grain chu isopaxial crystal tha tak atanga columnar crystal region thick takah a inthlak a, columnar crystal chu a lian chho zel bawk. Hei hi centrifugal casting solidification kalpui danah alloy a ni a, chu chu casting-a metal liquid, wall-a cooling, start knot, crystal solidification, crystalline latent heat chu cast wall continuous outward heat dissipation-ah perpendicular a nih chuan, chuvangin setting-a metal chu centrifugal casting process-a casting wall-a cold a nih chuan, a lumna sang tak chu a lum a, mahse, a lumna chu a lum a ni, mahse, a ni, leh, a chhan chu, leh,, a ni. Casting wall, metal wall bulah cooling effect chak tak hmangin overcooling℃ropui tak leh heterogeneous core tam tak a siam a ni. Heng core in cold melt in dendite growth, due to the heat dissipation of crystallization of crystallization without directional, and a lot of, core block chu an lo thang lian zel a, chuvangin circular casting wall area bulah chuan axial crystal organization te tak te, axial crystal organization a lo sang chho zel a, a bul atanga a lo thang lian zel tur, a bul atanga a lo than chhoh zelna tur fine axial crystal growth, a surface of fine axial crystal growth, lo developed from the outward and internal growth, developed Coagulation layer barrier cooling avang hian alloy liquid cooling speed a tlahniam a, chu chuan alloy solidification speed a tihhniam a, centrifugal casting process alloy liquid chu one-dimensional cooling temperature hmanga control ber a ni a, he hun lai hian solid-liquid interface-a one-way heat dissipation conditions, one-way heat flow action hnuaiah 1 casting growth-a alloy a awm a ni. Selective growth avang hian, columnar crystal lo awm danah chuan, bang atanga hlat poh leh crystal tha lote chu a bo tam poh leh columnar crystal lam hawi chu a concentrate tam zawk a, chu chu grain lian zawk a ni a, Figure 1 (c)-a kan hmuh ang hian a lian zawk a ni.
3 Macroscopic segregation chhan 3.1 Centrifugal casting solidification lai hian rotating metal liquid chu radial centrifugal force leh vertical-ah a awm a, straight downward gravity a awm bawk. Centrifugal force chu rotation radius nen a inzat a, angular rotation speed square nen a inzat bawk:
f hi M2R atanga hla a ni.
Khawiah nge: F chu metal liquid-a centrifugal force a ni a; M chu metal liquid mass a ni a; A cast te rotating angular velocity a ni. Gravitational field-a gravity acceleration ang bawkin, metal liquid chuan rotating centrifugal force field-ah centrifugal acceleration a nei ang.3.2 CRMO ring casting 42 centrifugal casting atana composition segregation, solute atom-te redistribution chu solidification temperature leh solid phase leh phase-a original composition nen a thleng ang. Chutiang chuan alloy composition-ah inthlak danglamna nasa tak a thlen thin. Macroscopic segregation equation P atanga a lan dan chuan alloy flow leh a solidification cooling velocity te average velocity chu macroscopic bias a ni.
u 1
Analysis hian a chanvo ber a nei a ni. A result chu 1 a nih chuan segregation a awm lo. Centrifugal force-in nghawng a neih avangin a flow speed chu a chak zawk a, chu chu alloy liquid flow speed v. solidification speed direction U nen inkalh takin, liquid chu two-phase region hot end atanga cold end thlengin a luang a, chu chu internal flow atanga solute tlem zawk atanga solute rich area root-ah a luang a, negative segregation a siam a, a danglamna a siam a, chu chuan a danglamna a siam a, chu chu a ni. He zirchiannaah hian alloy elements te thununna hnuaiah chromium hian carbon nen inzawmna nghet tak a nei a, chu chuan carbon diffusion rate a tihhniam a, supercooled austenite decomposition incubation period a tisang a, solidification speed a ti hniam a, chu chuan segregation a siam a ni.3.3 Layer segregation Figure 4 hi cast axi diagram a ni. Alloy liquid chu cast-ah a awm a, chu chu axial flow flow, motion, chu chu metal liquid layer hmasa ber a nih chuan, metal liquid layer hmasa ber 1 do axial flow, temperature tihhniamna avang te, flow speed te, small te, stream hmasa ber luang chhuak leh flow hmasa ber piah lam te, leh chutiang a nih avang te chuan, temperature solidification of temperature, such as ang chi, as ang chi concent.
3.4 Segregation tihziaawmna tura hmalakna Macro segregation tihziaawmna tura hmalaknate chu: 1 casting speed dik tak thlang la, chutiang chuan alloy liquid chuan
A FLOW SPEED TAK TAK.3 ALLOY liquid solidification process-ah incubation agent chu solidification ti chak turin add la, solid-liquid two-phase area-a solidification time tih tawi turin cooling method dik tak la la, a theih ang anga solidification cooling time tihpun rawh.
CU-17NI-3AL-X alloy casting hmanga tissue characteristics leh macro-seanalysis CU-17NI-3AL-X copper alloy chu outer circle diameter 265mm, thickness 50mm vel leh san zawng 125mm vel centrifugal casting method hmangin an siam a. Copper alloy casting-a tissue characteristic leh macro-segregation te chu metallography leh electronic probe hmangin an zirchiang a. A result atanga a lan dan chuan casting-ah hian isoaxial crystal leh cylindrical crystal chi hnih a awm a, chungte chu casting pawn lam bang leh chhung lam bang-ah an sem a, casting lai takah leh casting chhung lam bang bulah an sem chhuak a ni. Main combination-ah chuan Gold Elements Cu, NI, leh AL te chuan casting radial leh axial direction-ah macroscopic segregation tlemte an lantir a, mahse alloy design range chhungah an la awm reng a ni.2 Test Results 2.1 Casting-a casting-a tissue characteristics chu figure-a cast cast-a figure-a cast-a a lan dan figure atang hian a lang thei a Casting-a macroscopic organization chu hmun hrang hrang chiang tak paliah then theih a ni a, chungte chu: casting-a outer wall-a fine isoaxial zone (1, casting nena inmil (ID, coarse isoaxial zone (ii) casting chhung lam bulah, iv casting chhung lam kulh tawp hnaihah iv regions-a organizational characteristics te chu table 1-ah hian tarlan a ni.
A chhan chu metal melt flow leh solute atom redistribution hian alloy composition-ah nasa takin a inthlak danglam lo a ni. Macroscopic segregation-a discriminant formula ang chuan macroscopic segregation tihbo theihna tur condition chu:
v / u / ( 1)
Alloy an hriat chuan dendrite chhunga liquid flow average velocity leh alloy solidification velocity chu U an hre thei a ni. Solidified leh contracted alloy tan chuan dendrite-a liquid flow average velocity leh alloy solidification velocity chu a kalh zawngin a awm chuan liquid flow average velocity a tlem a, a tam poh leh macroscopic segregation tihtlem a tha zawk a ni. Centrifugal casting lai hian centrifugal force leh coridian force-a flow velocity chu a tlangpuiin a chak zawk a, hei hi macroscopic segregation tihkhawtlai nan a tha lo hle. Mahse, he zirchiannaah hian a component bulpui ber chu copper leh nickel a nih avangin, an density danglamna chu a tlem hle a, chubakah, centrifugal casting water cooling hian dendrite chu a ti tha thei a, alloy solidification speed a ti tha thei a, a bik takin casting blank (55mm vel) wall thickness chuan melt flow a titawp thei a, chutiang chuan casting of casting of casting of casting chu a tibo thei a ni.
RCC-M-in a phut angin, nuclear island CPR1000 reactor pressurized water reactor nuclear power plant-a main pipeline-a material chu Austenite stainless steel (French brand Z3CN20-09M) a ni. He test hian main pipeline-a iron awm zat chu MC1000 Shevler diagram (Schaeffler) leh MC1340 section-te angin a teh a, method hrang hranga detection result inang lo awm chhante pawh a zirchiang bawk. Pipeline lian ber siam dan leh RCC-MM3406 chhunga thu awmte atanga chhutin, pipeline-a iron awm zat insem darh zel chhan chu an zirchiang a. Ferrite content leh MC1340 tehna hmanrua hman dan tur, ferrite content tehna, leh main canal-a ferrite sem dan inang lo tihbo dan tur chu a tawi zawngin tarlan a ni.
Centrifugal casting-a harsatna chu centrifugal force hnathawh hnuaia rotating metal liquid a ni a, elements density sang tak, organization chuan wall-ah trend lian zawk a nei a (Centrifugal tube pawn lam surface-ah) deposition, leh density, element leh organization te hian trend lian zawk a nei a, he phenomenon hi centrifugal casting a ni a, chu chu casting, external, will made the external, will made a ni. Centrifugal tube Austenite stainless casting, carbon, nitrogen, phosphorus leh sulfur elements te chu centrifugal tube chhung lam atanga float turin, leh centrifugal tube pawn lam atanga density sang tak tak te. RCC-M Z3CN20-09M Austenite-a centrifugal tube-a thil awm chu ferrite pakhat ferrite stainless steel, carbon, nitrogen, phosphorus, sulfur leh element dang density te nen a inzawm chuan iron aiin a hniam zawk hle a, casting hollow cooling process (natural cooling)-a metal steel leih chhuah a ni a, chu chu inner wall-a sulphorus, nitrogen-a awm, a ni a, chu chu, morffur-in a ti a, chu chu a ni, a ni, a ni. leh inner surface increase lo lang atanga element dangte.Test sample group pahnih chu Table 2-ah thlan a ni a, nitrogen awm zat chu spectroscopic method hmangin an chhut a ni. A result chu Table 3-ah tarlan a ni a, a chunga inference hi a chiang lehzual a ni.
Metallography leh Schevler diagram leh a atanga delong diagram atanga hmuh theih a ni a, carbon leh nitrogen te hi austenite siam emaw stabilization emaw tichaktu ber an ni. DeLong diagram-ah chuan nickel tlukpui chhiarna element-a carbon leh nitrogen chu 30% a ni. A tawp berah chuan, a chhung lam bang atanga a pawn lam bang thlenga centrifugal tube-a ferrite awm zat chu a pawn lam atanga a pawn lam atanga carbon leh nitrogen a pun leh a chhung lam atanga a chhunga floating leh sedimentation a nih chuan centrifugal tube casting a ni.2.3 Control of Centrifugal Casting components industrial production, centrifugal casting components, centrifigal casting as manufactures of manufactures of manufactures with manufacture a chhung lam a wear resistance sang tak a awm bawk. Chu bakah, centrifugal casting hnuah chuan water spray rapid cooling (water cooled centrifuge tube) centrifugal casting pipe chu air cooling centrifugal casting tube aiin a tlem zawk a, iron sem dan pawh a inang tlang hle bawk. MP30 ferrite tester hmangin Yangjiang 1 unit pawn lam 1 / 4, 1 / 2 leh 1 / 4-a iron awm zat an teh a. Detection point chu Figure 6-ah hian tarlan a ni a, a result chu Table 4-ah tarlan a ni a, Table 4-ah hian centrifugal casting hnuah water spraying rapid cooling chu hman a ni a, chu chu a chhunga tui bang atanga pawn lam bang thlenga iron distribution pung zel langsar tak a awm lo.(3) Metallography leh delong diagram atanga hmuh theih angin, nitrogen chu carbon nen a inang a, chu chuan austenite emaw stable austite emaw elements a siam a ni. Main centrifugal tube furnace-a composition analysis leh control-ah chuan, Shevler-Diagram, nitrogen leh residual element dangte hmanga tehna RCC-MM3406-a ferrite awm zat pawh a tlin bakah control a ngai bawk.(4) Austenite Ferrite stainless steel centrifuge tube chu centrifugal force-in a solidified a nih chuan. Nitrogen leh carbon density hi iron aiin a hniam zawk avangin centrifuge tube chhung lam bang lamah a migrate duh a, chu chuan component hrang hrang inthen darh avanga ferite content inthen darhna a thlen thin. Austenite-Ferrite stainless steel centrifuge tube composition leh tissue segregation control dan chu tui hmanga siam centrifugation a ni. Chutih rual chuan centrifugal casting hian composition segregation characteristic a siam a, chu chuan special product leh castings te chu performance requirement neiin a siam thei a ni.
