DZ125

HuaNickel DZ125is a nickel-based precipitation hardening directional solidification columnar crystal superalloy, with a service temperature below 1050°C, which is one of the alloys with the highest performance level among similar alloys in China. The alloy has good comprehensive properties of medium and high temperature and excellent fatigue resistance. The alloy is based on the composition of the United States René 125 alloy, by adjusting the titanium content and adding hafnium, the alloy has good casting properties, and can be cast into notBal directional solidified blades with complex inner cavities with wall thicknesses as small as 0.5mm. It is suitable for making high-temperature parts such as gas turbine rotor blades and guide vanes.

DZ125 Chemical composition：

	Fe	C	Cr	Co	W	Mo	AI	Ti	Ta	Hf	Fe	Zr	Si	Mn
Min	Bal	0.07	8.4	9.5	6.5	1.5	4.8	0.7	3.5	1.2	≤
Max		0.12	9.4	10.5	7.5	2.5	5.4	1.2	4.1	1.8	0.3	0.08	0.15	0.15

DZ125Physical properties：

Density	8.59g/cm³
Melting point	1230℃~1240℃
Magnetic properties	not

Coefficient of linear expansion

θ/℃		20～300	20～400	20～500	20～600	20～700	20～800	20～900	20～1000	20～1100
α/(10-6℃-1)	Longitudinal	12.45	12.86	13.26	13.53	14.04	14.55	15.06	16.02	17.03
	Transverse	12.27	12.96	13.03	13.39	13.91	14.43	14.96	15.84	16.84

Resilient performance

θ/℃		20	700	760	850	900	950	1000
E/GPa	Longitudinal	131～146	99～100	101～103	89～95	87～112	78～84	74～84
	Transverse	156～176		131～133	122～142		115～134	96～106

DZ125Mechanical properties：

Standard number	variety	Sampling	room temperatureTensile properties				Long-lasting performance
			σb/MPa	σpo.2/MPa	δ₅/%	ψ/%	θ/℃	σ/MPa	τ/h	δ₅/%
HB 7762  Q/6S 1321	Master alloy  Blade castings	Directional solidification teststicksLongitudinalStandardheattreatment	≥980	≥840	≥5.0	≥5.0	760	725	48	≤40
							980	235	20	≤22
									≥32	≥10

DZ125Alloy properties：

DZ125alloy can be treated with a variety of surface protective coatings, and the advanced vacuum arc coating has been used to significantly improve the alloy’s oxidation and thermal corrosion resistance. After the alloy was aged at 900°C for 4000 h, the TCP phase was not precipitated.

DZ125Uses of alloys：

HuaNickel DZ125alloy has been widely used to make directional hollow notBal turbine rotor blades of an advanced aero engine, and the blades are in good batch production and use.

DZ125Application field process performance：

Welding process: Vacuum brazing can be carried out, and the strength of the brazing joint reaches 60%~80% of the strength of the base metal.

Surface treatment: The alloy can be treated with a variety of surface protection treatments. The alloy hollow Blade castings are coated with a vacuum arc coating of Ni Cr Al Y Si with a good coating state and good application field process performance.

Relevant standards：

GB/T14992 、HB 7762、HB/Z140  、Q/6S 1321 DZ125 、 DZ125L