DZ422B 

HuaNickel DZ422B is a nickel-based precipitation hardening directional solidified columnar superalloy with a service temperature below 1050°C. The alloy has good comprehensive properties at medium and high temperatures, as well as excellent resistance to cold and heat fatigue, and has a stable structure during long-term use at high temperatures. The alloy still has good casting performance in thin-walled conditions, which can ensure the safety and reliable performance of thin-walled blades. It is suitable for making gas turbine rotor blades and other high-temperature parts.

DZ422B chemical composition：

	Ni	C	Co	W	AI	Ti	Nb	Hf	Fe	Zr	Si	Mn	S	P
Min	Bal	0.12	9	11.5	4.75	1.75	0.75	0.8	≤
Max		0.16	11	12.5	5.75	2.25	1.25	1.1	0.25	0.05	0.12	0.12	0.01	0.015

DZ422BPhysical properties：

Density	8.56g/cm³
Melting point	1315℃~1374℃
Magnetic properties	not

Coefficient of linear expansion

θ/℃		28～300	28～400	28～500	28～600	28～700	28～800	28～900	28～1000	28～1100
α/(10~⁶ ℃-1)	Longitudinal	11.37	12.57	12.85	13.01	13.63	14.08	14.60	15.44	16.58
	Transverse	11.46	12.69	12.90	13.10	13.60	13.96	14.75	15.48	16.71

Resilient performance

θ/℃		20	100	200	300	400	500	600	700	800	900	1000
Ed/GPa	Longitudinal	131	129	125	122	118	115	110	107	102	94	79
	Transverse	173	171	166	162	157	152	148	142	136	129	118
G/GPa	Longitudinal	37	36	35	34	33	32	31	29	28	26	24
	Transverse	46	44	43	42	41	39	33	37	35	33	30

DZ422BMechanical properties：

Standard number	variety	Sampling	room temperatureTensile properties			Long-lasting performance
			σb/MPa	σp0.2/MPa	δ₅/%	θ/℃	σ/MPa	τ/h	δ₅/%
HB 7762	Master alloy	Directional solidification test sticks LongitudinalsystemI	≥965	≥825	≥5.0	760	690	≥50	—
						980	220	20	≤2
								≥48	≥10

DZ422BAlloy properties：

The surface of the part is treated with Al-permeable, AI-Si or vapor deposition coatings, which further improve the alloy’s resistance to oxidation and hot corrosion. The alloy was aged at 800°C for a long time for 5000h, and no TCP phase was precipitated.

DZ422B Uses of alloys：

HuaNickel DZ422B alloy has been used to make gas turbine rotor blades for aero engines working below 980 °C, and has been put into line applications, and is in good condition for mass production and use. Similar alloys have been widely used in aero engine turbine blades.

DZ422B Application field process performance：

Parts Hitterrite Mente: The parts that are not machined on the surface should be carried out under vacuum stadt or protective atmosphere according to the prescribed system, and cooled by argon gas.

Relevant standards：

GB/T 14992 、HB 7762、 HB/Z140