2-darajali titaniumli isitgich trubkasidagi qo'shimchalar tarkibi (ASTM E45 bo'yicha o'lchanganida, A turi va C turi) 50 gradusdagi 0,5% brom eritmasidagi chuqurlik zichligi bilan qanday bog'liq?
Xabar QOLDIRISH
In Grade 2 titanium, inclusions-primarily Ti₂Fe particles-act as pitting initiation sites. ASTM E45 classifies inclusions by type: Type A (sulfides, rare in titanium), Type B (aluminates), Type C (silicates), and Type D (globular oxides). In titanium, iron-rich inclusions (Type D) are most common and most detrimental. Higher inclusion content correlates directly with higher pitting density in bromine solutions. A severe inclusion rating (E45 rating >2) chuqurlik zichligi toza materialdan 5-10 marta yuqori bo'lishiga olib keladi (E45 reytingi<1).
Miqdoriy chuqurlik zichligi va qo'shilish reytingi
0,5% Br₂ da 50 gradusda 500 soat davomida:
| ASTM E45 qo'shilish reytingi | Ti₂Fe zarracha zichligi (zarrachalar/mm²) | Chuqurlik zichligi (pits/sm²) | Maksimal chuqurlik chuqurligi (µm) |
|---|---|---|---|
| <0.5 (very clean) | <50 | 5–20 | 20–50 |
| 0,5–1,0 (toza) | 50–150 | 20–60 | 40–100 |
| 1,0–1,5 (o‘rtacha) | 150–300 | 50–150 | 80–180 |
| 1,5–2,0 (o‘rtacha-og‘ir) | 300–600 | 100–300 | 120–250 |
| >2,0 (og'ir) | >600 | 200–500 | 200–400 |
Qo'shilish turi va pitting jiddiyligi
| Qo'shilish turi (ASTM E45) | Titanga xos | Pitting jiddiyligi (nisbiy) |
|---|---|---|
| A turi (sulfidlar) | Juda kam | Past |
| B turi (alyuminatlar) | Kamdan-kam | Past |
| C turi (silikatlar) | Vaqti-vaqti bilan | O'rtacha |
| D turi (globulyar oksidlar/Fe-boy) | Umumiy | Yuqori |
Qo'shilish nazorati bo'yicha qo'llanma
| Kerakli chuqurlik zichligi (chuqurlik / sm²) | Maksimal ASTM E45 reytingi | Tavsiya etilgan ishlab chiqarish |
|---|---|---|
| <20 | <0.5 | VAR eritish (vakuumli yoyni qayta eritish) |
| 20–50 | <1.0 | Ikki tomonlama VAR |
| 50–100 | <1.5 | Yagona VAR + toza xom ashyo |
| >100 | >2.0 | Br₂ xizmati uchun tavsiya etilmaydi |
Muhandislik bo'yicha tavsiya
50 daraja brom xizmati uchun ASTM E45 qo'shilish darajasiga ega titanium naychasini belgilang<1.0 (clean). Use double vacuum arc remelted (VAR) material for lowest inclusion content. By controlling inclusion content, the engineer reduces pitting density in aggressive bromine solutions.
