研究了应变速率对奥氏体不锈钢Cr17Mn6Ni4Cu2N铸坯热塑性的影响.结果表明,壳层的微观组织为δ铁素体树枝晶分布在奥氏体晶粒内部,提高应变速率会降低其热塑性,并使裂纹形核位置由δ铁素体树枝晶处变为奥氏体晶界处;在芯部铁素体分布在奥氏体晶粒内部及晶界上,提高应变速率会提高其热塑性,且裂纹的形核位置由晶界铁索体处变为晶界铁素体和奥氏体晶界处.在高应变速率下变形,铁素体和奥氏体的强度均提高,并使它们之间的强度差别减小,导致裂纹形核位置由铁素体向奥氏体晶界转移.在壳层,较高的应变速率提高了奥氏体晶界处的应力集中,导致其塑性降低;在芯部,较高的应变速率降低了铁素体处的应力集中,使其热塑性提高.
参考文献
[1] | F.Tehovnik,F.Vodopivec,L.Kosec,Hot ductility of austenitic stainless steel with a solidification structure,Materiali in Tehnologije,40(4),129(2006) |
[2] | M.H.Parsa,M.N.Ahmadabadi,H.Shirazi,Evaluation of microstructure change and hot workability of high nickel high strength steel using wedge test,Journal of Materials Processing Technology,199(1-3),304(2008) |
[3] | S.Grobeiber,S.Ilie,C.Poletti,Influence of strain rate on hot ductility of a V-Microalloyed steel slab,Steel Research International,83 (5),445(2012) |
[4] | H.J.McQUEEN,Elevated-temperature deformation at forming rates of 10-2 to 102 s-1,Metallurgical and Materials Transactions A,33(2),345(2002) |
[5] | B.Mintz,M.Shaker,D.N.Crowther,Hot ductility of an austenitic and a ferritic stainless steel,Materials Science and Technology,13(3),243(1997) |
[6] | B.Mintz,A.Cowley,R.Abushusha,Hot ductility curve of an austenitic stainless steel and importance of dynamic recrystallization in determining ductility recovery at high temperature,Materials Science and Technology,15(10),1179(1999) |
[7] | N.D.Ryan,H.J.McQueen,Comparison of dynamic softening in 301,304,316 and 317 stainless steels,High Temperature Technology,8(3),185(1990) |
[8] | N.D.Ryan,H.J.McQueen,J.J.Jonas,The deformation behavior of types 304,316,and 317 austenitic stainless steels during hot torsion,Canadian Metallurgical Quarterly,22(3),369(1983) |
[9] | H.J.McQueen,S.Yue,N.D.Ryan,Fry,Hot working characteristics of steels in austenitic state,Journal of Materials Processing Technology,53(1-2),293(1995) |
[10] | S.P.Tan,Z.H.Wang,S.C.Cheng,Processing maps and hot workability of Super304H austenitic heat-resistant stainless steel,Materials Science and Engineering A,517(1-2),312(2009) |
[11] | P.Bilmes,A.Gonzalez,C.Llorente,M.Solari,Effect ofδ ferrite solidification morphology of austenitic stainless steel weld metal on properties of welded joints,Welding International,10(10),797(1996) |
[12] | A.D.Schino,J.M.Kenny,M.G.Mecozzi,Development of high nitrogen-low nickel-18%Cr austenitic stainless steels,Journal of Materials Science,35(19),4803(2000) |
[13] | J.N.Tarboton,L.M.Matthews,A.Sutcliffe,The hot workability of Cromanite,a high nitrogen austenitic stainless steel,Materials Science Forum,318-320,777(1999) |
[14] | F.Czerwinski,J.Y.Cho,The edge-cracking of AISI 304 stainless steel during hot-rolling,Journal of Materials Science,34(19),4727(1999) |
[15] | Z.H.Wang,W.T.Fu,S.H.Sun,Effect of preheating temperature on surface cracking of high nitrogen CrMn austenitic stainless steel,Journal of Materials Science and Techology,26(9),798(2010) |
[16] | A.Pinol-Juez,A.Iza-Mendia,I.Gutierrez,δ/γ inteface boundary sliding as a mechanism for strain accommodation during hot deformation in a duplex stainless steel,Metallurigical and Materials Transaction A,31(6),1671(2000) |
[17] | D.Jorge-Badiola,A.Iza-Mendia,Study by EBSD of the development of the substructure in a hot deformed 304 stainless steel,Materials Science and Engineering A,394(1-2),445(2005) |
[18] | REN Jianbin,SONG Zhigang,ZHENG Wenjie,XIANG Jinzhong,Hot deformation behavior of super austenitic stainless steel 254SMo,Journal of Iron and Steel Research,24(5),41 (2012)(任建斌,宋志刚,郑文杰,项金钟,254SMo超级奥氏体不锈钢的热变形行为,钢铁研究学报,24(5),41(2012)) |
[19] | C.M.Martin,R.N.Eric,L.B.Elliot,K.George,Hot working and recrystallization of as-cast 316L,Metallurgical and Materials Transactions A,34(8),1683(2003) |
[20] | C.M.Martin,R.N.Eric,L.B.Elliot,K.George,Hot working and recrystallization of as-cast 317L,Metallurgical and Materials Transactions A,34(12),3021 (2003) |
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