محبوبترین نویسندگان :
نویسندگان مقالات پربازدید :
مواد و طراحی
جزئیات رویداد
همایش ، رویداد ، ژورنال
اینستاگرام تی پی بین
حوزه های تحت پوشش رویداد

  • effect of cryogenic treatment on the tensile behaviour of en 52 and 21-4n valve steels at room and elevated temperatures

    نویسندگان :
    کلمات کلیدی :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 382
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this experimental study investigates the effects of cryogenic treatment on the tensile behaviour of en 52 and 21-4n valve steels at room and elevated temperatures. the materials are subjected to shallow cryogenic treatment (sct) at 193 k and deep cryogenic treatment (dct) at 85 k and the tensile behaviour is compared with that of the conventional heat treatment (cht). the high temperature tensile test is conducted at 673 k (400 °c) and 923 k (650 °c) for the en 52 and 21-4n valve steels respectively. the ultimate tensile strength of the en 52 and 21-4n dct samples show an enhancement of 7.87% and 6.76% respectively, over the cht samples tested at the elevated temperature. the average yield strength of the en 52 dct samples has an improvement 11% than that of the cht samples when tested at room and elevated temperatures. the deep cryogenic treatment conducted at the optimized condition shows 7.84% improvement in the tensile strength for the en 52 valve steel and 11.87% improvement for the 21-4n valve steel when compared to the strength of the samples without the cryogenic treatment. a scanning electron microscopic analysis of the fracture surface indicates the presence of dimples and microvoid coalescence on the grain facets and interfaces of the cryo-treated specimens. the fracture surface of the deep cryo-treated 21-4n valve steel specimen shows a complete intergranular fracture with deep secondary cracks between the grains. on comparing the results of the percentage elongation, the cryo-treated samples show a smaller reduction in the elongation than that of the cht samples. it is concluded that the precipitation of fine secondary carbide through cryogenic treatment is the reason for the improved strength and the reduction in elongation.

سوال خود را در مورد این مقاله مطرح نمایید :

با انتخاب دکمه ثبت پرسش، موافقت خود را با قوانین انتشار محتوا در وبسایت تی پی بین اعلام می کنم
مقالات جدیدترین رویدادها
مقالات جدیدترین ژورنال ها