Yuav ua li cas txiav txim siab yog H13 Cov Khoom Siv Tag Nrho Hardened

Metallographic tsom xam thiab hla -sectional hardness gradient testing yog cov txheej txheem tseem ceeb siv los txiav txim seb H13 cov khoom puas yog tag nrho hardened. Txhawm rau txiav txim siab seb qhov quenching qhov tob puas ua tau raws li qhov yuav tsum tau ua, nws yog qhov tseem ceeb los tsim kom muaj cov qauv tseem ceeb tau hloov pauv mus rau hauv martensite.

 

1. Hla-sectional hardness testing yog txoj kev txiav txim siab tshaj plaws.

Kev Ntsuas Cov Txheej Txheem: Ntsuas qhov hardness txhua ob mus rau peb millimeters ntawm qhov chaw mus rau qhov tseem ceeb tom qab txiav lub workpiece raws nws qhov chaw nruab nrab.

Kev lees txais:

48-52 HRC yog qhov tawv tawv;

Ua kom tiav hardening yog qhia los ntawm cov tub ntxhais hardness> 90% ntawm qhov tawv tawv (piv txwv li, Ntau dua lossis sib npaug rau 43 HRC);

"Incomplete hardening" yog ib qho ua tau yog tias cov tub ntxhais hardness tsawg dua 40 HRC.

Siv lub portable Leeb hardness tester (yuav tsum hloov pauv) lossis Rockwell hardness tester (HRC).

Xyuas kom ruaj ntseg ntawm kev pabcuam.

 

2. Metallographic Analysis (Basis for Authoritative Judgement)

Hardened / Unhardened Tshwm Sim ntawm Qhov Chaw

Nto: homogeneous carbides ntxiv zoo, koob -zoo li tempered martensite tib yam li ntawm sab laug

Tempered martensite nrog cov tub ntxhais sib xws Coarse martensite los yog sib xyaw ntawm ferrite thiab pearlite

Transition Zone: Tsis muaj qhov pom kev muag muag, cov qauv txuas mus ntxiv, lub hardness hloov pauv sai sai, thiab nws yuav ua rau tawg.

Kev Ntsuas Kev Ntsuas: Siv lub tshuab ntsuas metallographic ntawm 400x magnification tom qab qauv, polishing, thiab etching nrog 4% nitric acid cawv.

 

3. Cov txheej txheem txiav txim ntxiv

Kev txheeb xyuas cov txheej txheem Parameter:

yog tias qhov kub thiab txias poob ntawm 1020 txog 1050 degree;

yog hais tias lub sij hawm tuav yog xam raws li ib teev rau txhua txhua 25 hli thickness;

Yog tias qhov nruab nrab cua txias muaj cov dej concentration tsawg dua 0.5%, nws puas tsim nyog quenching roj?

Lub tshuab hluav taws xob ntsuas kub Curve Verification: Txhawm rau kom muaj kev txaus siab austenitization ntawm cov tub ntxhais, xyuas kom tag nrho cov cua sov, tuav, thiab cov ntaub ntawv txias kom tiav.

Initial Magnetic Assessment: Vim martensite yog ferromagnetic, lub hardened cheeb tsam qhia qhov tseem ceeb magnetism; txawm li cas los xij, qhov no yuav tsum tsis yog lub hauv paus tseem ceeb rau kev txiav txim.

Kev Ceeb Toom: Nyob rau hauv lub siab siab, workpieces nrog rau qhov chaw hardness tab sis tsis txaus core hardening yog yooj yim rau rupture.