http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
전만수(Joun Man Soo),신상현(Shin Sang Hyun),전병윤(Jun Byoung Yoon),이민철(Lee Min Cheol),서관수(Suh Kwan Soo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this paper, a new design of the sprinkler branch outlet for fire-extinguishing purposes is presented together with its manufacturing process. The conventional three-piece design is improved by a new one-piece design with the help of the manufacturing technology of cold forging. The forging process is simulated and optimized by the rigid-plastic finite element method and the design tryouts are thus minimized. It has been shown through its applications that the presented system is much more economical and structurally stronger.
전병윤(Jun Byoung Yoon),조현섭(Cho Hyun Sub),서관수(Suh Kwan Soo),조유종(Cho Yoo Jong),정용욱(Jung Young Yook),전만수(Joun Man Soo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A double roll rotary forming equipment is presented in this paper. The equipment is developed for joining the socket with the ball of a concave piston assembly with its geometrical tolerance requirements satisfied. The equipment is composed of a lathe, a double roll system and a roll pressing unit driven by the hydraulic system. The workpiece rotates by spindle chuck of the lathe while the double roll system approaches perpendicularly to the central line of the workpiece. The equipment is successfully applied to precision joining of the ball and the socket for the concave piston assembly of a high pressure hydraulic pump.