Puas muaj qhov cuam tshuam loj rau huab cua-resistant steel phaj nyob rau hauv qhov kub thiab txias?

Niaj hnub no, cia peb txheeb xyuas qhov cuam tshuam ntawm qhov kub siab ntawm huab cua-resistant steel daim hlau thiab lawv yuav cuam tshuam li cas:

1. Cov crystals hauvhuab cua-resistant steel daim hlauloj hlob thiab coarsen. Qhov degree ntawm coarsening txawv raws li qhov muaj pes tsawg leeg ntawm cov khoom siv hlau. Cov hlau uas muaj cov ntsiab lus ntau dua, manganese, thiab phosphorus yog qhov yooj yim rau coarsening, thaum cov khoom xws li txhuas, titanium, niobium, zirconium, thiab lwm yam, tuaj yeem cuam tshuam coarsening. Yog li ntawd, cov hlau kho nrog manganese thiab silicon yog suav tias yog cov coarse-grained steels. Tooj thiab aluminium alloy profiles kuj pom cov qauv coarse-grained tom qab overheating.

2.Overheatedhuab cua-resistant steelcov phaj yog nquag tsim cov qauv Widmanstätten. Cov qauv metallographic nyob rau hauv cov hlau zoo li robust fibrous bundles, dav faib thiab elongated. Kev kub dhau kuj tuaj yeem ua rau tsim cov qauv Widmanstätten hauv tooj dag thiab txhuas bronze, thiab cov qauv no muaj kev cuam tshuam ntau dua rau qib ntawm cov yas deformation thiab ductility ntau dua li cov qauv coarse-grained los ntawm overheating.

3.Elevated kub ua rau coarsening ntawm austenite nyob rau hauv cov hlau tom qab tshav kub-kho, nrog ib tug nce nyob rau hauv residual austenite thiab ib tug tseem ceeb txo nyob rau hauv lub zog piv rau nplua-grained austenite. Thaum cov hlau yog overheated, cov carbon thiab aluminium alloy ntsiab melted nyob rau hauv lub ferrite nce, ua rau ib tug txo nyob rau hauv qhov kev cia siab ntawm ferrite thiab txo qhov Mz point hauv qab chav tsev kub. Tom qab kev kho cua sov, cov ferrite tsis tuaj yeem hloov mus rau hauv austenite, thiab cov austenite residual tseem nyob hauv cov hlau. Thoob plaws hauv tag nrho cov txheej txheem kev thov ntawm cov khoom, cov seem austenite yaj, ua rau deformation hauv cov cuab yeej tshwj xeeb lossis cov khoom siv tshwj xeeb.

Residual austenite, muab faib raws li thaj tsam ntawm cov nplej, ua rau cov khoom siv raw khoom ntau dua ductile thiab rhiab rau cov teebmeem intergranular, txo cov kev tiv thaiv kev hnav ua haujlwm. Rau cov hniav hlau thiab huab cua-resistant steel daim hlau, overheating tsis tsuas yog tsub kom residual austenite tab sis kuj qhia polygonal martensite nyob rau hauv cov qauv, uas ua rau txo lub zog thiab yuam liab brittleness. Qhov qis melting point ntawm polygonal martensite tuaj yeem ua rau kev kho cua sov tawg los ntawm kev siv zog ntau dhau.

4.Thaum huab cua-resistant steel daim hlau raug overheating, tus nqi ntawm cov qauv metallographic nce, ua rau txo lub zog thaum kho cua sov thiab txo cov pob txha toughness tom qab quenching. Thaum kho cua sov, qhov sib txawv ntawm cov yas deformation ntawm ntau cov qauv tuaj yeem ua rau tawg yooj yim. Tsis tas li ntawd, cov qauv metallographic yog nquag hloov mus rau σ-theem, ua rau txo qis hauv cov khoom siv raw. Kev tswj xyuas qhov kub thiab txias thiab lub sij hawm ntawm kev kub ceev yuav pab kom tsis txhob muaj qhov tshwm sim ntawm cov txheej txheem overheating.