DZ640M

HuaNickel DZ640M is a cobalt-based precipitation hardening directional solidification columnar superalloy with a service temperature of less than 1040°C. The alloy has high initial melting temperature, stable structure, excellent resistance to cold and heat fatigue, oxidation resistance and hot corrosion resistance, and good comprehensive properties such as creep resistance, durability and fatigue resistance.

DZ640M Chemical composition：

	Co	C	Cr	Ni	W	Mo	AI	Ti	Ta	B	Zr	Fe	Si	Mn	P	S
Min	Bal	0.45	24.5	9.5	7	0.1	0.7	0.05	0.1	0.008	0.1	≤
Max		0.55	26.5	11.5	8	0.5	1.2	0.3	0.5	0.018	0.3	2	0.04	1	0.04	0.04

DZ640MPhysical properties：

Density	8.68g/cm³
Melting point	1345℃~1395℃
Magnetic properties	not

Coefficient of linear expansion

θ/℃	α/(10-6℃-1)		θ/℃	α/(10-℃-‘)
	Longitudinal	Transverse		Longitudinal	Transverse
20～100	8.7	8.3	20～600	12.3	12.3
20～200	10.3	10.1	20～700	12.7	12.7
20～300	11.0	10.9	20～800	13.0	13.0
20～400	11.5	11.4	20～900	13.1	13.4
20～500	12.0	11.9	20～1000	13.5	13.5

DZ640MMechanical properties：

Standard number	variety	Sampling	State	Long-lasting performance
				θ/℃	σ/MPa	τ/h	δ₅/%	ψ/%
GJB 5512.2HB7762	cast	Directional solidification test sticks  Longitudinal	Cast state	980	83	≥30	≥15	≥20
Q/5B 4042	cast			980	83	≥20	—	≥20

DZ640MAlloy properties：

DZ640M alloy has relatively flat stress-fracture-temperature parameter characteristics and not notch sensitivity. After long-term aging at high temperature, the alloy does not precipitate TCP phase, and the structure is stable.

DZ640MUses of alloys：

HuaNickel DZ640M alloy has been used to make turbine guide vanes for cooling complex cavities in aerospace, marine and land gas turbines.

DZ640MApplication field process performance：

Molding process and performance: The casting performance of the alloy is good, and it can be cast into a thin-walled directional hollow blade with a complex inner cavity.

Relevant standards：

GB/T14992  、GJB 5512.2 、HB7762  、HB/Z140   、Q/5B4042   DZ40M