Stress properties of Inconel 617 wire over temperature

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Stress properties of Inconel 617 wire over temperature

The development of inconel 617 wire depends on the highest creep force required at the high temperatures.The temperature of alloy annealing is chosen to provide the crude grains essential for the supreme temperature creep resistance. Recently the high temperature gas turbine way structuring manufacturers have understood the requirement of exploring the low cycle fatigue potential and creep.

The development action was made to explore this. The tension to tension axial load controlled LCF analysis data is obtained at 593oc or 1100oF and760oc or 1400oF as shown in the table:

Inconel 617 alloy Heatingseries	ASTM G. S. size no.	Tension-Tension AxialStress 34.5-413.7 MPa (5-60 ksi) Cycles to failure
XX0023UK	2.5	500
XX0015UK	5.0	64,391
XX0005UK	9.5	93,440

An enhancement in the LCF functioning with ASTM grain dimensions from four to five is important. After the vast thermochemical treatments, controlled action was made that inhibits the grain dimension of produced plate to ASTM three to six. Minor alteration in the constituent's concentration of inconel 617 wire provides the enhanced control and better stress cracking features. The blend of alloy's constituents and closely controlled consequences of thermochemical processing describe the extensively enhanced LCF functionality with minor or no failure of creep resistance despite of coarse grain elements.

An enhanced LCF performance of alloy 617 retains at high temperatures. it obtains significant metallurgical stabilization for other alloy possesses the same strength level. The below table determines the modifications in the tensile and impact features after the exposures for 12,000 hours at the high temperature ranges.

Exposure Temperature °F	Exposure Time, h	Yield Strength, ksi	Tensile Strength, ksi	Elongation%	Impact Strength ft-lb
1100	100	46.5	111.5	69	213
1100	12,000	67.6	132.0	34	69
1200	100	51.8	114.5	69	191
1200	12,000	77.5	144.0	32	38
1300	100	58.7	126.5	38	57
1300	4,000	70.6	138.0	36	48
1400	100	58.3	126.5	35	56
1400	12,000	56.4	129.5	38	67

The samples were received in the annealing conditions prior to exposure. The forcing to carbide production at the exposure temperature limits of 1200oF or 650oC to 1400oF to 750oC in the precipitation of gamma prime form. The inconel 617 resistance wire offers extensively improved creep cracking potential at the elevated temperatures of 1800oF or 980oC and more. This property paired with the excellent resistance to carburizing and oxidation makes this alloy an adequate material to provide extended performance in the high stress conditions at the high temperatures.

The alloy 617 is included in the category of those substances that come under the ASME code with propose pressures at temperature limits about 1800oF. The permitted design pressures from the 2005 version for the popular temperature purposes are compared with the UNS N06230 in the below table:

Temperature, °F	INCONEL alloy 617 AllowableStress, ksi	UNS N06230 Allowable Stress, ksi
1000	15.5	20.9
1050	15.4	20.9
1100	15.4	20.9
1150	15.3	19.0
1200	15.3	15.6
1250	14.5	12.9
1300	11.2	10.6

It has been noticed that the inconel 617 wire offers higher stress levels with the increase in temperature in the typical applications.

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