On the formation and technical importance of the microsegregation in austenitic chromium-nickel alloyed steels

✍ Scribed by Dr.-Ing. Ulrich Siegel

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 736 KB
• Volume: 20
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170201115

✦ Synopsis

Tlic ;iirstcriit,ic c:liroiiiiitiri-riicliel alloycd steels are showing clifferent t,,vpes of concentrnt.iontlistril)iitions of t,he cleiiients chronriurii and nickel in the aiistenite iii tlepcndairoe on t,hc, CVJIltPrlt of alloys. As t~ conscqnence of the crystallization of the hcnt t o ai~st~eriite t h c " t . q t i 2 t l directed" t,ype of segregation forms. The ferritic solitlificntion of tt hettt nnd t h r following fcrrit,e to aiistenite transformation leads to "uneqiml directed" sogrcgation in t h e nrrstcnite. Heats having both t h e types of segregation soliclify 11y way t t 3-phase reaction. For tieitts fi.rriticttrlly solirlificd better hot plasticity, lower siisceptil)ilit,y to hot cracking in t h e wcl(l and hetter polisha1)ility is obscrved cotn1)aretl with heats solidified austcnitically. Ttlc ti(lwtntagrs tirc ttccotint.eti to t h e lower separation during t h c ferritic solidificatioii its ( ~o n s r ( ~i ~f ~n c ~~ of the higher tiiffusivity of the alloying t i n t 1 accotirpariving cletiicnts i n thc fvrrit,c (wiir1)tire(i wit,h t hr aiistenitc.