MÔ TẢ SẢN PHẨM
Thường hóa kim loại Metal normalizing
Định nghĩa: Thường hóa là phương pháp nhiệt luyện bao gồm nung nóng thép đến trạng thái hoàn toàn là austenit (cao hơn Ac3 hay Acm), giữ nhiệt rồi làm nguội trong không khí tĩnh để austenit phân hóa thành tổ chức gần ổn định.
Mục đích:
- Giúp thép có độ cứng cao hơn, độ dẻo thấp hơn so với ủ để phù hợp cho gia công cắt gọt.
- Làm nhỏ hạt thép ( do nguội nhanh hơn ủ)
- Làm mất lưới XeII của thép sau cùng tích vì cơ tính rất xấu.
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What Is Normalizing?
Normalizing is a ferritic heat treatment process that is used to make a iron based alloy steel more ductile and tough. This is achieved after the part(s) have been subjected to thermal hardening processes. Normalizing involves heating the steel to an elevated temperature, followed by slow cooling to room temperature. The heating and slow cooling changes the microstructure of the steel. This reduces the hardness of the steel and will increases its ductility.
Normalizing is performed when another process has decreased ductility and increased hardness of machine steel parts. Normalizing reforms the microstructure into more ductile structures. This makes the metal more formable, more machinable, and reduces residual stress within the material that could lead to unexpected failure.
Normalizing vs. annealing
Normalizing | annealing |
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The Process
- Recovery stage
- A furnace raises the material to a high temperature where its internal stresses are relieved.
- Recrystallization stage
- The parts are heated above the materials recrystallization temperature, but below its melting temperature. This causes new grains without stresses.
- Grain growth stage
- New grains grow. Controlled growth by allowing the parts to cool to room temperature.
What can Thermex Normalize?
Iron based alloys (tool steel, carbon steel, stainless steel, and cast iron)
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