铁素
3.The deposited ferritic weld metal shall not contact the austenitic or high-chromium steel cladding.
4.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.
5.After having been nitrided for 2 to 4 hours at 560℃,most material used for ingot can obtain the layer and surface hardness which is similar to that of ferrite?s nitrocarburizing (except low carbon steel).
6.The test results showed that with aging at 650 ℃,the rich copper phase particles precipitated prior at ferrite grain boundary,and with increasing isothermal aging time the size of rich copper phase increased.
7.It is shown that the final microstructure is mainly of polygonal ferrite and some pearlite, the average ferrite grain size is about 4-7μm.
8.Abstract: In this paper,pesent the development and trends in chemi cal component controlling,hot rolling and coiling processing,ferritic hot rollin g,TRIP steel processing,cool rolling,annealing and surface quality controlling f or deep drawing sgeet steels are analyzed and discussed.
9.The hardness of deboronized layer is very low with boron content much lower than that of Fe_2B.According to the results of metallographic EMXA and TEM analysis, it can be concluded that the deboronized layer consists ot ferrite which is due to air leaking into the furnace at cooling stage causing Fe_2B oxidied.
10.In this paper,the regularity,how the mixed grain structures of austenite and ferrite of steel 15 MnV were affected by the reheating temperatures and the rolling process parameters of steel blanks,and the change tendency of mixed austenite grain structures during the hot rolling were studied by using the method of quantitative metallography in order to provide the essen- tial reference basis for the determination of the controlled rolling program.
