Tus qauv rau kev tshuaj xyuas metallographic ntawm cov hlau ductile yog lub hauv paus tseem ceeb rau kev tsim cov hlau ductile, kev tshuaj xyuas cov khoom zoo, thiab kev tswj hwm zoo. Kev tshuaj xyuas metallographic thiab kev sim hardness tuaj yeem ua raws li tus qauv thoob ntiaj teb ISO 945-4: 2019 Metallographic Inspection of Ductile Iron, thiab cov txheej txheem yog raws li nram no:
I.Kev Txiav thiab Kev Kuaj:
Siv lub tshuab txiav metallographic rau kev txiav cov qauv. Kev txias dej raug siv thoob plaws hauv cov txheej txheem txiav kom tiv thaiv kev hloov pauv hauv cov qauv metallographic ntawm cov qauv los ntawm cov txheej txheem kuaj tsis raug. Tshwj xeeb, ntau hom tshuab txiav metallographic tuaj yeem xaiv rau kev txiav thiab kuaj raws li qhov loj ntawm cov qauv thiab cov txheej txheem tsis siv neeg xav tau.
II.Qauv Sib Tsoo thiab Polishing:
Tom qab txiav, cov qauv (rau cov khoom ua haujlwm tsis sib xws, lub tshuab nias kuj tseem xav tau los ua cov qauv) raug sib tsoo rau ntawm lub tshuab sib tsoo thiab polishing siv cov ntawv xuab zeb ntawm ntau qhov sib txawv ntawm cov xuab zeb ntxhib mus rau qhov zoo. Peb lossis plaub hom ntawv xuab zeb tuaj yeem xaiv rau kev sib tsoo raws li cov khoom ua haujlwm sib txawv, thiab qhov ceev ntawm kev sib tsoo thiab polishing tshuab kuj tseem yuav tsum tau xaiv raws li cov khoom.
Cov qauv tom qab sib tsoo ntawv xuab zeb yog polished siv daim ntaub polishing felt nrog cov pob zeb diamond polishing compound. Qhov ceev ntawm kev sib tsoo thiab polishing tshuab tuaj yeem hloov kho raws li qhov workpiece.
III.Kev Ntsuas Metallographic:
Raws li qhov yuav tsum tau ua ntawm GB/T 9441-2021 Metallographic Testing Standard rau Ductile Iron, lub tshuab microscope metallographic nrog lub magnification tsim nyog raug xaiv los thaij duab ntawm cov qauv metallographic ua ntej thiab tom qab xeb.
IV.Kev Ntsuas Qhov Nyuaj ntawm Cov Hlau Uas Muaj Qhov Coob:
Kev kuaj qhov nyuaj ntawm cov hlau ductile yog raws li tus qauv thoob ntiaj teb ISO 1083: 2018. Brinell Hardness (HBW) yog txoj kev kuaj qhov nyuaj uas nyiam thiab ruaj khov tshaj plaws.
- Cov Cai Siv Tau
Qauv Thickness: ≥ 10mm (indentation diameter d ≤ 1/5 ntawm cov qauv tuab)
Qhov Xwm Txheej Ntawm Qhov Chaw: Qhov roughness ntawm qhov chaw Ra tom qab ua tiav yog ≤ 0.8μm (tsis muaj nplai, qhov xuab zeb, lossis qhov cua tshuab)
- Cov Khoom Siv thiab Cov Kev Ntsuas
| Khoom Siv Parameter | Qhov Yuav Tsum Tau Ua (rau Cov Hlau Uas Muaj Qhov Coob) | Lub hauv paus |
| Qhov Indenter Txoj Kab uas hla (D) | 10 hli (nyiam dua) los yog 5 hli (rau cov qauv nyias nyias) | Siv 10 hli thaum HBW ≤ 350; siv 5 hli thaum HBW > 350 |
| Thov Zog (F) | Rau 10 hli indenter: 3000kgf (29420N); Rau 5 hli indenter: 750kgf (7355N) | F = 30 × D² (Brinell hardness formula, xyuas kom meej tias qhov indentation phim qhov loj ntawm graphite) |
| Lub Sijhawm Nyob | 10-15 vib nas this (15 vib nas this rau ferritic matrix, 10 vib nas this rau pearlitic matrix) | Tiv thaiv kom tsis txhob muaj kev hloov pauv ntawm graphite los ntawm kev cuam tshuam rau kev ntsuas qhov indentation |
Lub sijhawm tshaj tawm: Kaum Ib Hlis-26-2025
