时效时间对Cr20Mn18N0.8高氮奥氏体不锈钢组织与力学性能的影响研究
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摘要
研究了800℃下时效处理不同时间对固溶态Cr20Mn18N0.8高氮奥氏体不锈钢组织与力学性能的影响。结果表明,固溶态Cr20Mn18N0.8高氮钢具有优异的强韧性能,其屈服强度为640 MPa、抗拉强度970 MPa、伸长率为52.2%、断面收缩率43.1%、冲击吸收功高达311 J;时效处理对高氮钢强度影响不大,但使其塑性与韧性下降,这是由于在时效过程中,Cr_2N相首先沿晶界析出,并随时间延长在晶界与晶内同时析出所导致;固溶态高氮钢拉伸断口具有典型的韧性断裂特征;时效处理4 h后,冲击断口纤维区出现沿晶断裂特点。
The effects of aging treatment at 800 ℃ on the microstructure and mechanical properties of solid solution Cr20Mn18N0.8 high nitrogen austenitic stainless steel were studied. The results show that, solid solution Cr20Mn18N0.8 high nitrogen steel has excellent strength and toughness, its yield strength is 640 MPa, the tensile strength is 970 MPa, the elongati on is 52.2%. The cross section shrinkage is 43.1%, and the impact absorption energy is up to 311 J. Aging treatment has little effect on the strength of high nitrogen steel, but the ductility and toughness of the steel decrease. This is due to the first precipitation of Cr_2N phase along grain boundary during aging, and the simultaneous precipitation of Cr2 N phase along grain boundary and crystal with the extension of the time. The tensile fracture of solid solution high nitrogen steel has typical ductile fracture characteristics. After aging treatment for 4 h, intergranular fracture occurs in the fiber zone of impact fracture.
The effects of aging treatment at 800 ℃ on the microstructure and mechanical properties of solid solution Cr20Mn18N0.8 high nitrogen austenitic stainless steel were studied. The results show that, solid solution Cr20Mn18N0.8 high nitrogen steel has excellent strength and toughness, its yield strength is 640 MPa, the tensile strength is 970 MPa, the elongati on is 52.2%. The cross section shrinkage is 43.1%, and the impact absorption energy is up to 311 J. Aging treatment has little effect on the strength of high nitrogen steel, but the ductility and toughness of the steel decrease. This is due to the first precipitation of Cr_2N phase along grain boundary during aging, and the simultaneous precipitation of Cr2 N phase along grain boundary and crystal with the extension of the time. The tensile fracture of solid solution high nitrogen steel has typical ductile fracture characteristics. After aging treatment for 4 h, intergranular fracture occurs in the fiber zone of impact fracture.
引文
[1]Speidel H J C,Speidel M O.Nickel and chromium-based high n itrogen steel[J].Materials And Manufacturing Proeesses,2004,19(l):96-110.
[2]Andrew J H.Nitrogen iron[J].Carnegie Scholarship Memoirs,1912,11:227-235.
[3]Adeock F.The effect of nitrogen on chromium and ironchromium alloys[J].Journal of the Iron and Steel Institute,1926,114(2):119-127.
[4]Uhlig H H.Corrosion handbook[M].New York:John Wiley and Sons,1948,132-135
[5]Franks R,Binnder W O,Thompson J.Austenitic chromium manganese nickel steels containing nitrogen[J].Transactions of the American Society for Metals,1995,47(2):231-266.
[6]Douthett J A.Nitronic family of nitrogen-bearing stainless steels[J].Metal Progress,1975,108(3):50-54.
[7]Stein G,Huchlenbroich I.Manufacturing and application of high nitrogen steels[J].Materials and Manufacturing Processes,2004,19(l):7-17.
[8]毛萍莉,苏国跃,杨柯.0Cr17Mnl4Mo2N双相不锈钢组织与性能的关系[J].材料热处理学报,2001,22(3):19-22.
[9]束德林.工程材料力学性能[M].北京:机械工业出版社,2007:56-65.
[2]Andrew J H.Nitrogen iron[J].Carnegie Scholarship Memoirs,1912,11:227-235.
[3]Adeock F.The effect of nitrogen on chromium and ironchromium alloys[J].Journal of the Iron and Steel Institute,1926,114(2):119-127.
[4]Uhlig H H.Corrosion handbook[M].New York:John Wiley and Sons,1948,132-135
[5]Franks R,Binnder W O,Thompson J.Austenitic chromium manganese nickel steels containing nitrogen[J].Transactions of the American Society for Metals,1995,47(2):231-266.
[6]Douthett J A.Nitronic family of nitrogen-bearing stainless steels[J].Metal Progress,1975,108(3):50-54.
[7]Stein G,Huchlenbroich I.Manufacturing and application of high nitrogen steels[J].Materials and Manufacturing Processes,2004,19(l):7-17.
[8]毛萍莉,苏国跃,杨柯.0Cr17Mnl4Mo2N双相不锈钢组织与性能的关系[J].材料热处理学报,2001,22(3):19-22.
[9]束德林.工程材料力学性能[M].北京:机械工业出版社,2007:56-65.