Effects of Isothermal Aging on Microstructure Evolution, Hardness and Wear Properties of Wrought Co-Cr-Mo Alloy

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Khaimanee P., Choungthong P., Uthaisangsuk V.

ผู้เผยแพร่: Springer

ปีที่เผยแพร่ (ค.ศ.): 2017

วารสาร: Journal of Materials Engineering and Performance (1059-9495)

Volume number: 26

Issue number: 3

หน้าแรก: 955

หน้าสุดท้าย: 968

จำนวนหน้า: 14

นอก: 1059-9495

eISSN: 1544-1024

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85011711374&doi=10.1007%2fs11665-017-2525-x&partnerID=40&md5=4a534a12cc19b1b3cff5428c5164017e

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

In this work, effects of isothermal aging on phase transformation, microstructure evolution, hardness and wear resistance of the wrought Co-Cr-Mo alloy with low carbon content were investigated. Initially, temperature range of FCC to HCP phase transformation of the alloy was determined by a dilatometer test. Then, aging at the temperature of 850 ฐC for different holding times with subsequent water quenching was carried out. Metallography examination, x-ray diffraction analysis, microhardness test and wear test were performed for Co-Cr-Mo alloy specimens after the isothermal aging. It was found that the FCC to HCP phase transformation occurred in the temperature range between 700 and 970 ฐC. During the aging treatment, phase fraction of the HCP martensite increased with longer aging time. The FCC to HCP phase transformation was completed after 12 h, because very fine lamellae in different orientations thoroughly dispersed within FCC grains were observed. These lamella structures could be well correlated with formation of the HCP martensite. Small amounts of carbides were found at grain boundaries and grain intersections in the samples aged for 6 and 12 h. In addition, by longer aging time, the average grain size of the aged alloy became a little bit larger, while the hardness noticeably increased. For the examined Co-Cr-Mo alloy, higher amount of the emerged HCP martensitic phase led to the increased hardness value, but reduced friction coefficient and wear rate. ฉ 2017, ASM International.

คำสำคัญ

Co-Cr-Mo alloy, HCP martensite, Isothermal aging, Phase Transformation