Effect of Cold Drawing Strain on Morphology and Distribution of Primary Carbides in High Nb Austenitic Stainless Steel
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摘要: 对热锻态高铌奥氏体不锈钢进行不同变形量(0,0.45,0.71,1.02)的冷拔+固溶处理,研究了冷拔变形量对试验钢中初生碳化物形貌和分布的影响,并分析了其影响机理。结果表明:试验钢组织为奥氏体+粗大NbC,冷拔变形可以有效破碎NbC;提高冷拔变形量有利于NbC细化,弥散性增强,但变化幅度减小;相同冷拔变形量下,试验钢边部的NbC比心部的尺寸更小,弥散性更强;冷拔细化NbC的机理主要是NbC塑性与奥氏体基体相差较大,导致变形无法保持一致,在应力集中和位错滑移的共同作用下,沿冷拔方向产生机械破碎。Abstract: The hot forged high Nb austenitic stainless steel was treated by cold drawing with different strains (0,0.45, 0.71, 1.02) and solution treatment. The effect of cold drawing strain on the morphology and distribution of primary carbides were studied, and the influence mechanism was analyzed. The results show that the microstructure of the test steel consisted of anstenite and coarse NbC, and cold drawing could refine NbC effectively. Increasing the cold drawing strain was beneficial to refine NbC, enhance its dispersion, but the range of change was reduced. Under the same cold drawing strain, the NbC at the test steel edge was smaller and more dispersive than that at the core. The large difference between the ductility of NbC and the austenitic matrix, resulting in the incoordinate of the deformation. Under the combination of stress concentration and dislocation slip, mechanical breaking of NbC occured along the cold drawing direction. That was the refining mechanism of NbC during cold drawing.
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Keywords:
- austenitic stainless steel /
- NbC /
- cold drawing /
- refinement
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[1] 袁志钟. 戴起勋. 程晓农. 等.氮在奥氏体不锈钢中的作用[J].江苏大学学报(自然科学版). 2002. 23(3):72-75. YUAN Z Z. DAI Q X. CHENG X N. et al.Effects of nitrogen in austenitic stainless steels[J].Journal of Jiangsu University of Science and Technology. 2002. 23(3):72-75.
[2] 赵进刚. 张宝伟. 王明林.高强度奥氏体不锈钢的发展[J].材料开发与应用. 2005. 20(4):38-40. ZHAO J G. ZHANG B W. WANG M L.Development of high strength austenitic stainless steel[J].Development and Application of Materials. 2005. 20(4):38-40.
[3] JANOVEC J. SVOBODA M. V AY'G ROSTKOVÁ A. et al.Time-temperature-precipitation diagrams of carbide evolution in low alloy steels[J].Materials Science and Engineering:A. 2005. 402(1/2):288-293.
[4] 雍岐龙. 孙新军. 郑磊. 等.钢铁材料中第二相的作用[J].科技创新导报. 2009. 6(8):2-3. YONG Q L. SUN X J. ZHENG L. et al.The role of the second phase in steel materials[J].Science and Technology Innovation Herald. 2009. 6(8):2-3.
[5] 宋爱玲. 曹铁山. 程从前. 等.晶粒形态对HR3C耐热不锈钢时效脆性的影响[J].机械工程材料. 2022. 46(3):51-56. SONG A L. CAO T S. CHENG C Q. et al.Effect of grain morphology on aging brittleness of HR3C heat-resistant stainless steel[J].Materials for Mechanical Engineering. 2022. 46(3):51-56.
[6] 谌康. 程世长. 张军战. 等.大块含铌MC碳化物对LF2合金高温性能的影响[J].机械工程材料. 2012. 36(3):18-21. SHEN K. CHENG S C. ZHANG J Z. et al.Effect of massive MC carbide with niobium on high-temperature properties of LF2 alloy[J].Materials for Mechanical Engineering. 2012. 36(3):18-21.
[7] 李益民.大型火电机组用新型耐热钢[M].北京:中国电力出版社. 2013. LI Y M.New heat-resistant steel for large thermal power units[M].Beijing:China Electric Power Press. 2013. [8] 雍歧龙.钢铁材料中的第二相[M].北京:冶金工业出版社. 2006. YONG Q L.The second phase in steel materials[M].Beijing:Metallurgical Industry Press. 2006. [9] 田研. 赵明纯.高强度油井管钢中的Nb偏析及形成机制分析[J].钢铁研究学报. 2020. 32(4):344-350. TIAN Y. ZHAO M C.Segregation of Nb and its formation mechanism of high strength casing steel[J].Journal of Iron and Steel Research. 2020. 32(4):344-350.
[10] 麻建中. 黄一君. 黄友桥. 等.Nimonic 80A合金螺栓的组织织构及高温应力松弛行为[J].中国冶金. 2022. 32(7):74-79. MA J Z. HUANG Y J. HUANG Y Q. et al.Texture characteristics and high temperature stress relaxation behaviors of Nimonic 80A alloy bolt[J].China Metallurgy. 2022. 32(7):74-79.
[11] 刘娜.渗碳淬火工艺参数对17CrNiMo6钢性能的影响[J].金属加工(热加工). 2020(3):57-60. LIU N.Effect of carburizing and quenching process parameters on properties of 17CrNiMo6 steel[J].MW Metal Forming. 2020(3):57-60.
[12] 于瑞芝. 刘洪波.加热温度与时间对MC5轧辊钢液析碳化物溶解扩散的影响[J].特钢技术. 2013. 19(2):31-34. YU R Z. LIU H B.Influence of heating temperature and time on solubility and diffusivity of liquation carbide in MC5 roller steel[J].Special Steel Technology. 2013. 19(2):31-34.
[13] 李阳. 魏志坚. 徐平伟. 等.热变形对GH4169合金中NbC析出相尺寸形貌影响[J].稀有金属材料与工程. 2020. 49(5):1773-1780. LI Y. WEI Z J. XU P W. et al.Effect of thermal deformation on size and morphology of NbC precipitates in GH4169 alloy[J].Rare Metal Materials and Engineering. 2020. 49(5):1773-1780.
[14] 王燕. 俞峰. 曹文全. 等.热变形对高温轴承钢中碳化物的均质化与细质化影响规律研究[J].热加工工艺. 2015. 44(13):35-37. WANG Y. YU F. CAO W Q. et al.Effects of thermal deformation on refinement and uniformity of carbide in high temperature bearing steel[J].Hot Working Technology. 2015. 44(13):35-37.
[15] 张茂华. 毛卫民.取向电工钢中碳化物在冷变形过程中的行为[J].材料研究学报. 2012. 26(4):344-348. ZHANG M H. MAO W M.Behaviors of carbides in grain-oriented electrical steels during cold deformation[J].Chinese Journal of Materials Research. 2012. 26(4):344-348.
[16] 徐海涛. 燕春光. 张舒展. 等.奥氏体不锈钢中液析碳化物在高温均匀化过程中的演化[J].压力容器. 2022. 39(4):9-16. XU H T. YAN C G. ZHANG S Z. et al.Evolution of primary NbC in austenitic stainless steel during high temperature homogenization[J].Pressure Vessel Technology. 2022. 39(4):9-16.
[17] ZHOU B. SHEN Y. CHEN J. et al.Breakdown behavior of eutectic carbide in high speed steel during hot compression[J].Journal of Iron and Steel Research. International. 2011. 18(1):41-48.
[18] ZENG T Y. ZHANG S Z. SHI X B. et al.Effect of NbC and VC carbides on microstructure and strength of high-strength low-alloyed steels for oil country tubular goods[J].Materials Science and Engineering:A. 2021. 824:141845.
[19] 马怀宪.金属塑性加工学:挤压、拉拔与管材冷轧[M].北京:冶金工业出版社. 1991. MA H X.Metal plastic working:Extrusion. drawing and cold rolling of pipes[M].Beijing:Metallurgical Industry Press. 1991. [20] ZHAO S L. FAN J F. ZHANG J Y. et al.The hot deformation behavior of spray-formed high speed steel[J].Powder Metallurgy and Metal Ceramics. 2017. 56(1/2):17-25.
[21] JAGADEESH G V. SETTI S G.A review on micromechanical methods for evaluation of mechanical behavior of particulate reinforced metal matrix composites[J].Journal of Materials Science. 2020. 55(23):9848-9882.
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