%0 Journal Article
%T FATIGUE FRACTURE BEHAVIOR OF LOW CARBON MARTENSITE AND MARTENSITE/BAINITE DUPLEX STRUCTURE IN STEEL 20CrMnMo
%A LI Yongjun Xi′an Jiaotong University
%A Xi′an
%A China
%J 金属学报(英文版)
%D 1992
%I 
%X Fatigue crack propagation rate,da/dN,and threshold stress intensity range,ΔK_(th),of steel20CrMnMo containing low carbon martensite or low carbon martensite/bainite(LCM/B)duplex structure,obtained by oil quenching and austempered at 360℃,have been measuredusing specimens under four-point bending.Observation was also made of the crack path andfracture morphology with relation to microstructure.The formation of LCM/B duplexstructure,which caused by 20% lower bainite after short-time isothermal treatment,may re-markably increase ΔK_(th)and considerably decrease da/dN.The effect of microstructure onda/dN and ΔK_(th)was discussed with the emphasis on the crack propagation path.
%K low carbon martensite
%K duplex structure
%K fatigue crack propagation rate
%K threshold stress intensity range
%K crack path<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=E34333DC5B60D35AA4A6A38347AB21B6&yid=F53A2717BDB04D52&vid=94C357A881DFC066&iid=38B194292C032A66&sid=D2742EEE6F4DF8FE&eid=F9F74EC1AA08A7B9&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=10