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Microstructure and Properties of 2Cr13-xMo Stainless Steels Fabricated by Direct Laser Deposition
Jing Liang,Ziyang Lin,Xiuyuan Yin,Suiyuan Chen,Changsheng Liu,Ruihong Chai,Hongwei Zhang,Guangquan Tang,Kun Tian 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
In this paper, 2Cr13 stainless steels with diferent Mo contents (x=0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%, 2.0 wt%) were fabricated by Direct Laser Deposition (DLD) technology. The efects of Mo element on the microstructure evolution and comprehensive properties such as corrosion resistance and wear resistance of 2Cr13 stainless steel were investigated in detail. The results showed that the microstructure for the DLD 2Cr13 stainless steel was mainly composed of martensite, ferrite,and a small amount of Mo2C and Cr23C6 carbides. With the content of Mo increased from 0.5 to 1.5 wt%, the martensiticmicrostructure was refned and more dispersed Mo2C and Cr23C6 carbides were formed. The average microhardness andcorrosion resistance of the DLD 2Cr13-xMo were increased with the Mo content increased from 0 to 1.0 wt%, and thendecreased when the Mo content exceeded 1.0 wt%. For the DLD 2Cr13-1.0 wt% Mo, the average microhardness reachedup to 620 HV0.2, and the highest corrosion resistance (self-corrosion potential − 0.34 V) was obtained, in which the selfcorrosion potential was 0.05 higher than that of DLD 2Cr13 stainless steel. The wear resistance of the DLD 2Cr13-xMogradually increased with the increase of the Mo, the wear mass loss of DLD 2Cr13-xMo (x=1.0 wt%) was only 37% thatof DLD 2Cr13 stainless steel.
한창석(Chang-Suk Han),Sung-Yooun Jin 호서대학교 공업기술연구소 2020 공업기술연구 논문집 Vol.39 No.1
수요가 급증하는 엔지니어링 플라스틱 성형에 대한 금형부식 문제, 고속절삭에 의한 금형 가공 능률 향상 등 플라스틱 금형재료에 대하여 고객이 직면하고 있는 실용적인 특성평가를 통해 새로운 금형재료 및 그에 따른 적합한 사용법을 제안한다. 수지의 종류에 따라 열처리강인 13Cr계 스테인리스강뿐만 아니라 Cr포함 (4%) 40HRC의 예비열처리 석출경화강에서도 금형부식 문제를 완화할 수 있다. Cr포함 석출경화강은 일반적인 석출경화강에 비해 절삭온도가 낮기 때문에 고속절삭에서도 belag가 안정하게 공구표면에 부착, 퇴적하기 때문에 안정된 가공이 가능하다. We propose a new mold material and its proper usage through the practical characteristics evaluation that customers face with plastic mold materials, such as mold corrosion problems for engineering plastic molding, which has rapidly increased demand, and improvement of mold processing efficiency by high speed cutting. Depending on the type of resin, it is possible to alleviate the problem of mold corrosion not only in 13Cr stainless steel, which is heat-treated steel, but also in preheat-treated precipitation hardened steel containing Cr (4%) 40HRC. Precipitation hardening steel with Cr has lower cutting temperature than general precipitation hardening steel, so stable processing is possible because the belag adheres and deposits on the tool surface stably even at high speed cutting.
25Cr-13Ni 스테인리스강의 고온 크리프-피로거동에 관한 연구
송전영 ( Jeon Young Song ),안용식 ( Yong Sik Ahn ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.2
The low cycle fatigue (LCF) and creep-fatigue (hold time tension fatigue, HTTF) tests were performed on the modified 25Cr-13Ni cast stainless steel, which was selected as a candidate material for exhaust manifold in automotive engine. The exhaust manifold is subjected to an environment in which heating and cooling cycle occur due to the running pattern of automotive engine. Several types of fatigue behaviour such as thermal fatigue, thermal mechanical fatigue and creep-fatigue are belong to the main failure mechanisms. High temperature tensile test was firstly carried out to compare the sample with the traditional cast steel for the component. The low cycle fatigue and HTTF tests were carried out under the strain controlled condition with the total strain amplitude from ± 0.6% to ± 0.7% at 800oC. The hysteresis loops of HTTF tests showed significant stress relaxation during tension hold time. With the increase of tension hold time, the fatigue life was remarkably deceased which caused from the formation of intercrystalline crack by the creep failure mechanism. (Received February 5, 2015; Revised February 11, 2015; Accepted February 16, 2015)
염수환경 내 해드필드강 용접열영향부의 부식 및 침식-부식 거동에 미치는 Cr 첨가의 영향
진승우,박진성,윤덕빈,이상철,최종교,오민석,김성진 대한금속·재료학회 2023 대한금속·재료학회지 Vol.61 No.12
The corrosion and erosion-corrosion behaviors in the weld heat-affected zone (HAZ) of Hadfieldsteels with varying Cr contents (1, 2, and 3 wt%) were examined. Various experimental methods, includingelectrochemical polarization, impedance, and weight loss measurements, were utilized. Two types of isothermalheat treatments were conducted in a box furnace to simulate the intercritical HAZ, known to be themost vulnerable region in terms of mechanical properties and environmental stabilities, and large-scalesamples for the erosion-corrosion experiment were fabricated. The results showed that increasing the Crcontent improved the resistance to corrosion and erosion-corrosion, but there was an inflection point whereadding more Cr had the opposite effect. Up to 2 wt%, a higher resistance was exhibited owing to the formationof a thin and protective oxide scale enriched with Cr that adhered to the steel surface. On the other hand,adding 3 wt% of Cr resulted in decreased resistance. This was due to the formation of coarse M7C3 (M: Cr)precipitated along the grain boundary, which caused the development of a thick and unstable oxide scale thatdetached locally. Based on these findings, it is essential to optimize the Cr content to ensure a high resistanceto corrosion and erosion-corrosion in the HAZ of Hadfield steel.