Issiqlik bilan ishlov berish ta'sirida garfild po‘latining mikro tuzilishini tahlil qilish

Gadfild Po‘lati taxminan 13% marganets (Mn) va 1% uglerodni (C) o‘z ichiga olgan legirlangan Po‘latdir. Yeyilishga yuqori qarshilikka ega, yuqori bosim va zarba yuklariga bardosh bera oladi, yuqori plastisitiklikka ega. Po‘lat 110G13L quyma olish uchun yeyilishga bardoshli, yuqori marganetsli, austinitli Po‘lat sifatida tasniflanadi. Unga bir vaqtning o‘zida yuqori bosim va zarba yuklari ta'sir qilganda yeyilishga yuqori qarshilikka va shu bilan birga kuchli birikishga ega.

Metodologiya

Laboratoriya sharoitida 110G13L Po‘latni eritish texnologiyasi induksion tigel pechida ishlab chiqilgan ( 1-rasm ). Ushbu Po‘latning tuzilishini o‘rganish uchun namunalar “ havoda o‘zi qotuvchi qolip aralashmasi” dan yasalgan qolipga gravitatsion quyish usuli bilan quyilgan ( 2-rasm ). Metallni qolipga quyish 1410 °C haroratda amalga oshirilgan.

Po‘lat strukturasini o‘rganish uchun namunalar 3-rasmda ko‘rsatilgan shaklda kesilgan. Namunalarni issiqlik bilan ishlov berish qarshiliklar pechida 1-jadvalda keltirilgan rejimlarga muvofiq amalga oshirilgan.

1-rasm. Induksion tigel pechi

1-jadval. Turli xil namunalar guruhlari uchun tavsiya etilgan qattiqlashuv harorati

Bo‘limlar standart protsedura bo‘yicha tayyorlangan. Po‘lat konstruktsiyani o‘rganish TESCAN VEGA 3 skanerlash elektron mikroskopida o‘tkazildi ( 4-rasm ). Issiqlik bilan ishlov berish rejimiga qarab Gadfild po‘latining mikro tuzilmalari 5 va

6-rasmlarda ko‘rsatilgan.

5-rasm. 110G13L po‘latning mikro tuzilishi (a) issiqlik bilan ishlovsiz, (b) issiqlik bilan ishlov berish (T = 800ºS, ushlab turish vaqti 30 minut)

6-rasm - 110G13L po‘latning mikro tuzilishi (a) issiqlik bilan ishlovsiz, (b) issiqlik bilan ishlov berish (T = 1100ºS, ushlab turish vaqti 30 minut) XULOSA

Taqdim etilgan 110G13L po‘latining mikro tuzilishi ko‘rsatkichlarida 800 ºC haroratda karbidlarning uzoq qo‘shilishi mavjud va saqlanib qolganligini ko‘rish mumkin. Tuzilishda deyarli o‘zgarishlar yo‘q va 1100 ºC haroratda karbidlarning ignaga o‘xshash qo‘shimchalari yumaloq bo‘lib, eriy boshlaydi. Shu sababli, karbidlarning to‘liq erishi uchun ushlab turish vaqtini oshirish kerak.

Adabiyotlar

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