激光熔覆304不锈钢组织与力学性能研究
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摘要
为了研究激光熔覆304不锈钢和轧制态304不锈钢拉伸力学性能的差异,在27SiMn钢基体表面进行不同激光扫描速度下,单道激光熔覆304不锈钢实验,得到了单道熔覆层的宏观形貌和显微组织。在单道良好成形性的激光扫描速度下,进行多道搭接实验,得到了熔覆层横截面宏观形貌。最后进行多层累加,得到了拉伸力学性能曲线和拉伸断口形貌。结果表明,随着激光扫描速度的不断增大,单道熔覆层成形性较差,搭接率为50%的情况下,所得的熔覆层成形性较好。激光熔覆304不锈钢抗拉强度为551.32 MPa,拉伸断口形貌表现为明显的韧性断口;原轧制态304不锈钢抗拉强度为713.11 MPa,拉伸断口形貌表现为明显的脆性断裂断口。
In order to study the difference in tensile mechanical properties between laser cladding 304 stainless steel and rolled 304 stainless steel, a single laser cladding 304 stainless steel experiment was carried out on the surface of 27 SiMn steel substrate at different laser scanning speeds, and the macroscopic morphology and microstructure of the single pass cladding layer were obtained. A multi-pass lapping experiment was carried out at a single pass laser scanning speed of good formability, and the cross-section macroscopic morphology of the cladding layer was obtained. Finally, multi-layer accumulation was carried out to obtain the tensile mechanical property curve and the tensile fracture morphology. The results show that with the increasing laser scanning speed, the single pass cladding layer has poor formability. Under the condition of 50% lap rate, the obtained cladding layer has good formability. The tensile strength of laser cladding 304 stainless steel is 551.32 MPa, and the tensile fracture morphology shows obvious ductile fracture, the tensile strength of the original rolled 304 stainless steel is 713.11 MPa, and the tensile fracture morphology shows obvious brittle fracture.
In order to study the difference in tensile mechanical properties between laser cladding 304 stainless steel and rolled 304 stainless steel, a single laser cladding 304 stainless steel experiment was carried out on the surface of 27 SiMn steel substrate at different laser scanning speeds, and the macroscopic morphology and microstructure of the single pass cladding layer were obtained. A multi-pass lapping experiment was carried out at a single pass laser scanning speed of good formability, and the cross-section macroscopic morphology of the cladding layer was obtained. Finally, multi-layer accumulation was carried out to obtain the tensile mechanical property curve and the tensile fracture morphology. The results show that with the increasing laser scanning speed, the single pass cladding layer has poor formability. Under the condition of 50% lap rate, the obtained cladding layer has good formability. The tensile strength of laser cladding 304 stainless steel is 551.32 MPa, and the tensile fracture morphology shows obvious ductile fracture, the tensile strength of the original rolled 304 stainless steel is 713.11 MPa, and the tensile fracture morphology shows obvious brittle fracture.
引文
[1] 韩文静,张培训,汤其建,等.单体液压支柱缸体激光熔覆Ni60A+20% WC性能[J].煤炭学报,2012,37(2):340-343.
[2] 郭卫,菅含含,柴蓉霞,等.27SiMn钢表面激光熔覆的数值模拟与验证[J].热加工工艺,2016,45(18):1-6.
[3] 解文正,李春强,杨志伟,等.激光熔覆技术在液压支架上的应用研究[J].煤矿机械,2010,31(10):106-108.
[4] 杨庆东,苏伦昌,董春春,等.液压支架立柱27SiMn激光熔覆铁基合金涂层的性能[J].中国表面工程,2013,26(6):42-47.
[5] 柴蓉霞,李凯凯,郭卫,等.热处理工艺对304不锈钢熔覆层组织和性能的影响[J].激光与光电子学进展,2018,55(5):279-285.
[6] 李鹏.基于激光熔覆的三维金属零件激光直接制造技术研究[D].武汉:华中科技大学,2005.
[7] 张庆茂,刘喜明,孙宁,等.送粉式宽带激光熔覆——搭接基础理论的研究[J].金属热处理,2001(2):25-28.
[8] SHI X Z,MA S Y,LIU C M,et al.Selective laser melting-wire arc additive manufacturing hybrid fabrication of Ti-6Al-4V alloy:microstructure and mechanical properties[J].Materials Science and Engineering:A,2017(684):196-204.
[9] ZHU Y Z,WANG S Z,LI B L,et al.Grain growth and microstructure evolution based mechanical property predicted by a modified Hall-Petch equation in hot worked Ni76Cr19AlTiCo alloy[J].Materials & Design,2014,(55):456-462.
[10] JIA W,MA L,TANG Y,et al.Relationship between microstructure and properties during multi-pass,variable routes and different initial temperatures hot flat rolling of AZ31B magnesium alloy[J].Materials & Design,2016(103):171-182.
[11] MURR L E,ESQUIVEL E V,QUINONES S A,et al.Microstructures and mechanical properties of electron beam-rapid manufactured Ti-6Al-4V biomedical prototypes compared to wrought Ti-6Al-4V[J].Materials Characterization,2009,60(2):96-105.
[2] 郭卫,菅含含,柴蓉霞,等.27SiMn钢表面激光熔覆的数值模拟与验证[J].热加工工艺,2016,45(18):1-6.
[3] 解文正,李春强,杨志伟,等.激光熔覆技术在液压支架上的应用研究[J].煤矿机械,2010,31(10):106-108.
[4] 杨庆东,苏伦昌,董春春,等.液压支架立柱27SiMn激光熔覆铁基合金涂层的性能[J].中国表面工程,2013,26(6):42-47.
[5] 柴蓉霞,李凯凯,郭卫,等.热处理工艺对304不锈钢熔覆层组织和性能的影响[J].激光与光电子学进展,2018,55(5):279-285.
[6] 李鹏.基于激光熔覆的三维金属零件激光直接制造技术研究[D].武汉:华中科技大学,2005.
[7] 张庆茂,刘喜明,孙宁,等.送粉式宽带激光熔覆——搭接基础理论的研究[J].金属热处理,2001(2):25-28.
[8] SHI X Z,MA S Y,LIU C M,et al.Selective laser melting-wire arc additive manufacturing hybrid fabrication of Ti-6Al-4V alloy:microstructure and mechanical properties[J].Materials Science and Engineering:A,2017(684):196-204.
[9] ZHU Y Z,WANG S Z,LI B L,et al.Grain growth and microstructure evolution based mechanical property predicted by a modified Hall-Petch equation in hot worked Ni76Cr19AlTiCo alloy[J].Materials & Design,2014,(55):456-462.
[10] JIA W,MA L,TANG Y,et al.Relationship between microstructure and properties during multi-pass,variable routes and different initial temperatures hot flat rolling of AZ31B magnesium alloy[J].Materials & Design,2016(103):171-182.
[11] MURR L E,ESQUIVEL E V,QUINONES S A,et al.Microstructures and mechanical properties of electron beam-rapid manufactured Ti-6Al-4V biomedical prototypes compared to wrought Ti-6Al-4V[J].Materials Characterization,2009,60(2):96-105.