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- 저자 : 예병준 ( Kwan Soo Suh (검색결과 2 건)
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오스템퍼링 조건과 Mn 의 양이 ADI 의 기계적 성질에 미치는 영향
서관수,예병준 ( Kwan Soo Suh,Byung Joon Ye ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.5
N/A In this study, we investigated effect of austempering factors and Mn addition on mechanical properties of ADI with ferrite-bainite matrix by pearlite-bainite transformation treatment. Ductile cast iron specimens containing various of Mn were austenitized at 875℃ for 350 sec or 925℃ for 160 sec and then austempered at 300℃ or 400℃ for the various periods(5 to 30 min). Manganese increased pearlite volume fraction in as cast ductile cast iron. The obtained results are as follows ; 1) In austenitizing, hardness of sepecimens austenitized at 875℃ for 350 sec was higher than that of 925℃ for 160 sec. 2) In effect of austempering temperature, tensile strength and handness of specimens austempered at 300℃ was higher than that of 400℃. However, elongation had reverse tendency. 3) Increasing austempering time decreased hardness due to the increment of bainite and retained austenite fractions. However, toughness are increased.
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구상흑연주철의 Mn 성분과 펄라이트-베이나이트변태처리의 변화가 미세조직에 미치는 영향
서관수,예병준 ( Kwan Soo Suh,Byung Joon Ye ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.3
N/A The purpose of present investigation is to obtain ductile cast iron with ferrite-bainite matrix by pearlite-bainite transformation treatment. Ductile cast irons having three kinds of Mn ampunt had been manufactured. Mn increased pearlite volume fraction iin as-cast ductile cast iron. Ductile cast irons of different pearlite fraction were austenitized at 875℃ for 230-350 sec or 925℃ for 130-170 sec followed by austempering at 300℃ or 400℃ for the various periods of time from 5 to 30 min. When specimen was austenitixed for 130 sec at 925℃ and for 230 sec at 875℃, pearlite was transformed into austenite. Bainite around graphite was found at 925℃ for 170 sec. Bainite in grain boundary of ferrite was happened at 875℃ for 350 sec. During the austempering process, acicular bainite was precipitated at 300℃ and lath bainite was precipitated at 400℃. Increment in manganese content restrained bainitic transformation. Retained austenie was of little quantity.
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