Mechanical Properties of MaterialsNo Access

EFFECT OF BORON ON CREEP DUCTILITY AND CREEP RUPTURE LIFE IN 9CR-1.5MO STEEL

School of Mechanical Engineering, Sungkyunkwan University, 300, Chunchun-Dong, Jangan-Gu, Suwon, Gyeongki-Do, 440-746, South Korea

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JIWOO IM

School of Mechanical Engineering, Sungkyunkwan University, 300, Chunchun-Dong, Jangan-Gu, Suwon, Gyeongki-Do, 440-746, South Korea

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MOON K. KIM

School of Mechanical Engineering, Sungkyunkwan University, 300, Chunchun-Dong, Jangan-Gu, Suwon, Gyeongki-Do, 440-746, South Korea

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JONGHOON LEE

School of Mechanical Engineering, Sungkyunkwan University, 300, Chunchun-Dong, Jangan-Gu, Suwon, Gyeongki-Do, 440-746, South Korea

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, and

BYEONGSOO LIM

School of Mechanical Engineering, Sungkyunkwan University, 300, Chunchun-Dong, Jangan-Gu, Suwon, Gyeongki-Do, 440-746, South Korea

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https://doi.org/10.1142/S0217979210065143Cited by:2 (Source: Crossref)

Abstract

In this study, the relationship between the creep ductility and rupture life of 9Cr-1.5Mo steel with boron addition at 600°C was investigated by small punch (SP) creep test from the viewpoint of the modified Monkman-Grant relation. The amount of boron addition ranged from 0.0076wt% to 0.0196 wt%. The general concept of Monkman-Grant ductility for uniaxial creep was introduced and then particularly modified for the SP creep. The microstructure of the steel was observed to analyze the effect of boron addition on the creep ductility and rupture life. Based on the modified Monkman-Grant ductility for SP creep, it was found that the boron addition improved the creep ductility and rupture life of the 9Cr-1.5Mo steel. Also, the relationship between the minimum creep displacement rate and the amount of boron addition was analyzed.

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