Martensite temperature
1.The results show that the Ms(martensite start temperature)and Af(reverse transformation finish temp erature)of Ru-49Ta alloy are 1065℃and 10 85℃respectively,and the transformation range(Ms-Mf)is 15℃. The marten sitic hysteresis a nd transformation heat of Ru-49Ta alloy are,22℃and 2J/g respectively.
2.At the same time, 1.41%C ultra-high carbon steel obtains a great deal of lath martensite at the quenching temperature range of 860~890℃.
3.After the 40Cr steel is heated in the one-phasic austenite range and the biphasic range and then austempered, the structure analisis of it shows that owing to the different conditions and compositions of austenites, we can obtain different kinds of structures after aus-tempering at equal temperatures, and the transformation ranges of bainite ang martensite will move toward lower temperature.
4.Tempered martensite was gradually generated as the cutting temperature increased,which is the main cause of the decrease in the hardness.
5.Part of the aus-tenite formed at intermediate temperatures transforms into martensite while thesteel was cooled down to room temperature.
6.NATURE OF ISOTHERMAL TRANSFORMATION BETWEEN ROOM TEMPERATURE AND MARTENSITE POINT IN A BALL-BEARING STEEL
7.The Behavior of internal fuction associated with the process of martensite (bcc→bct) and reverse martensite (bct→bcc) transformation in goldcadmium alloy containing 49 at % Cd was studied with torsion pendulum. The variation of internal friction with temperature is similar to that of resistance; No internal friction peak was observed in the temperature range of phase transformation in AuCd which appeared in many other alloys Such as Fe-Mn alloy, etc.
8.When the temperature at the top of chain link gets 970～993℃ while the temperature at the side gets 895～917℃,the hardened structure of chain link top is lath martensite and the grain size is of grade 10 to 10.5,the round link chain can get optimum matching of strength and toughness.
9.It shows that the morphology of ferrite changes with the temperature of hardening in critical zone, when ferrite assumes acicular constituent and alterates with martensite and the amoumt of ferrite is 15～25%,its effect of the strengthing and toughening is the best.
10.The effects of quenching temper ature, aging temperature and time on microstrain △a/a have been investigated by means of X-ray diffraction. As shown in the electron transmission micro graph the reverted austenite disperses along ihebound aries of martensite, thus improving the impact toughness ak.
