7Cole G S. Inhomogeneities and their control via solidification[ J]. Metallurgical and Materials Transcations, 1971,2B(2) :357.
8Kwon H, Lee K B , Lee J B,et al. Secondary hardening and fracture behavior in alloy steels containing Mo, W, and Cr[ J] . Metallurgical and MaterialsTranscations,1997,28(3) :775 -784.
9Ohtani H,Feng H C , McMahon C J. New information on the mechanism of temper embrittlement of alloy steels [ J]. Metallurgical and MaterialsTranscations, 1974 ,5(2) :516 -518.
10Yu Jin,McMahon C J. The Effects of composition and carbide precipitation on temper embrittlement of 2. 25 Cr-1 Mo Steel: Part I . Effects of P andSn[ J]. Met Trans A,1980,ll(2) :277 -289.
