Optimization of the high temperature tensile strength design method for the GH3128 Alloy

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Abstract GH3128, a domestic Ni-based superalloy, has good high-temperature performance and is a promising main structural material for intermediate heat exchangers (IHX) which are the key component in very high temperature reactors (VHTR). The existing American Society of Mechanical Engineers (ASME) standard is shown to be inappropriate. Then, 3 fitting methods (single polynomial fit, 2-step polynomial fit and 2-step exponential fit) are used to calculate the allowable design strengths for the tensile strength. The results show that the 2-step polynomial fit method should be used for the ultimate tensile strength with the 2-step exponential fit method for the yield strength. These design curves give consistent and reliable design margins for the structural design of IHX.

Keywords very high temperature reactors (VHTR) intermediate heat exchangers (IHX) GH3128 tensile strength

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TL353

Issue Date: 15 September 2015

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	ZHAO Xi
	YUAN Kun
	ZHOU Yu

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ZHAO Xi,YUAN Kun,ZHOU Yu. Optimization of the high temperature tensile strength design method for the GH3128 Alloy[J]. Journal of Tsinghua University(Science and Technology), 2015, 55(9): 998-1002.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2015/V55/I9/998

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