AMS 4179, Alloy 7175-T7452, MIL-A-22771

AMS 4179, Alloy 7175-T7452, MIL-A-22771
STEELMAX Steel Story

AMS 4179 는, 용체화 처리 (solution heat treated), 응력 제거 열처리
(stress relieved), and 석출 열처리 (precipitation heat treated 알루미늄으로

5.6Zn-2.5Mg-1.6Cu-0.23Cr 합금 원소를 가지는 Alloy 7075 이면서 Temper,
T7452, die forging, 열처리 가능한, 고강도 우주 항공. 방위 산업용 금속입니다.

AMS 4179 는, MIL-A-22771 과 대응되며, Brinell Hardness 135 min. 입니다
AMS 4179 는, AMS-QQ-A-367, ASTM B247 7175-T7452 와 대응됩니다.

※ Solution treatment (용체화 처리, 고용화 처리)
Heat treatment intended for dissolve previously precipitated
constituents and retain them in solution

이전에 이미 석출 된 성분들을 재 용해 되어 완전히 분해되
조직 내에 고용되어 다시 석출 되지 않게 하는 열처리.

※ Stress Relief (응력 제거 어닐링 (풀림)
Heating to a suitable temperature, holding long enough
to reduce residual stresses and than cooling slowly
enough to minimized the development of new residual stresses.
A heat treatment in which the lock-up stresses in a bar caused
by cold working are removed by heating the bar closed to but
below the lower limit of the critical temperature range,
or to approximately 100℉ below the tempering temperature.

적당한 온도로 가열하고 균열화한 후, 적절한 온도로 냉각함으로써
실질적인 조직의 변화 없이 내부 응력을 줄이고자 시행하는 열처리.

※ Precipitation Hardening Steels (석출 경화 : 析出硬化)
Steels with the property of being hardened by a method wherein
a small amount of elements such as aluminium, copper, etc.
is added and compounds of those elements or the like are
precipitated by heat treatment

알루미늄, 구리 등의 원소를 소량 첨가하고, 열처리에 의해
이들 원소 화합물을 석출 시켜 경화 하는 성질을 지니게 한 강.

※ Precipitation (석출 : 析出)
A phenomenon in which a crystal of a different phase is
separated from a solid solution and grows.

7175 T7452 Aluminum, B247, t≤80
Chemical composition (%)	Silicon (Si)	0.15 max
	Iron (Fe)	0.20 max
	Copper (Cu)	1.2~2.0
	Manganese (Mn)	0.10 max
	Magnesium (Mg)	2.1~2.9
	Chromium (Cr)	0.18~0.28
	Zinc (Zn)	5.1~6.1
	Titanium (Ti)	0.10 max
	Other each	0.05 max
	Other total	0.15 max
	Aluminum (Al)	remainder
Tensile strength (MPa)		505 min
(0.2%) Yield strength (MPa)		435 min
Elongation (%) in 50mm		7 min
Specimen Axis Parallel Direction of Grain Flow