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《55Mn鋼表面激光熔覆原位析出顆粒增強Ni基復(fù)合涂層的組織與性能》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、!!"#鋼表面激光熔覆原位析出顆粒增強$%基復(fù)合涂層的組織與性能李!晶，鐘敏霖，劉文今（清華大學(xué)機械系先進成形制造教育部重點實驗室，北京!"###$%）摘要：在楔橫軋模具鋼&&’(表面采用同軸送粉)*+激光熔覆,)-./)01鎳基合金復(fù)合粉末，在增碳、鋯條件下可獲得成形好、無裂紋、與基體冶金結(jié)合的熔覆層。熔覆層微觀組織特征為!（-23，4/）基體上均勻分布的大量從液+態(tài)析出的富含./、,、56的復(fù)合碳化物顆粒相。熔覆層表層顆粒尺寸約為78$!9，顆粒數(shù)量約為:&##個199；+熔覆層中部析出顆粒數(shù)目約為%+"##個199，尺寸約為"8:!9；熔覆層底部析出
2、顆粒尺寸約為"8+!9，顆粒+數(shù)量約為";$##個199。中部區(qū)域個別析出顆粒相中間出現(xiàn)黑色圓點狀組織。激光熔覆后模具鋼表面形成:個不同的硬度分布區(qū)域，激光熔覆層硬度為%+7<=#>+，深度"#+#!9；熱影響區(qū)硬度為7%#<=#>+，深度7$#!9；基體的硬度為+&#<=#>+。激光熔覆后的硬度分布兼顧了模具使用要求和后續(xù)加工。無潤滑的環(huán)塊磨損試驗發(fā)現(xiàn)：激光熔覆處理后的試樣摩擦系數(shù)降低:#?，耐磨性提高一倍。關(guān)鍵詞：激光熔覆；析出相；耐磨性中圖分類號：&’(!)*++,,文獻標(biāo)識碼：-,,文章編號：./!01).!(（/..)）((1...21.!"%3
3、456748378496:#;<45=947%965>?:6941@A:;%#6%78<:47%3A9B9%#>5439;$%1C:69@5D=56%79@5:7%#E5#!!"#F799A@AB/(C，5<*4D’/(-E/(，@AF,3(-G/(（H3I@JKL6JML6INL6OPQJ(R3P’JM36/JEST6LR3SS/(C.3RU(LELCI，’/(/SM6ILNVPWRJM/L(，X30J6M93(MLN’3RUJ(/RS，.S/(CUWJF(/Q36S/MI，Y3/G/(C"###$%，)U/(J）-G674:37：ORL(M/(WLWS
4、-ZJQ3)*+EJS36ZJSWS3PMLREJPJ,)-./)0J6M/RE3-63/(NL6R3P4/-KJS3RL90LS/M3RLJM/(CL(MLJM6J(SQ36S3Z3PC36LEE/(C9LWEPSM33E&&’(SWKSM6JM3KIRL-J[/JEN33P/(C(L\E3].U33[036/93(MJE63SWEMS/(P/RJM3MUJML(MU3RL(P/M/L(LN4/1)，56JPP3P，MU3REJPEJI36SJ6393MJEEW6C/RJEEIKL(P3PMLMU3SWKSM6JM3Z/MUN/(3SUJ03J(PN6
5、33LN0L63SJ(PR6JR^S].U39/R6LSM6WRMW6JERUJ6JRM36/SM/RSLNMU3REJPEJI36S/SMU3UL9LC3(3LWSP/SM6/KWM/L(LNJEJ6C3_WJ(M/MILN/(S/MWRL90E3[0J6M/RE3SZ/MU./，,J(P563(6/RU3P063R/0/MJM3PP/63RMEIN6L9E/_W/PSLEWM/L(SL(MU3!（-23，4/）9J-M6/[].U3S/3LN0J6M/RE3S/(MU3ML0，9/PPE3J(PKLMML9J63JLNREJPEJI36/S/(MU3
6、6J(C3LN7ML$!9，"ML:!9J(P"+ML+!963S03RM/Q3EI，J(PMU3(W9K36SP/SM6/KWM3P/(MU3S3J63JSJ63JKLWM:&##，%+"##J(P";$##03699].U363J63SL93KEJR^PLMSJ003J6/(C/(MU3R3(M36LNSL930J6M/RE3S063R/0/MJM3P/(MU39/PPE3J63JLNMU3REJPEJI36].U633J63JSLNMU3P/NN363(M9/R6LUJ6P(3SSP/SM6/KWM/L(J63NL693P/(MU3R6LSSS3RM
7、/L(LNMU39LWEPSM33EKIEJS36REJPP/(C].U39/R6L-UJ6P(3SS/(MU3REJPEJI36/SJKLWM%+7<=#>+Z/MUMU3P30MULN"#+#!9，/(MU3U3JMJNN3RM3PL(3/SJKLWM7%#<=#>+Z/MUMU3P30MULN7$#!9J(P/(MU3SWKSM6JM3/SJKLWM+&#<=#>+>‘WRU9/R6LUJ6P(3SSP/SM6/KWM/L(RJ(933MMU363-_W/6393(MLNMU3N/(JE9JRU/(/(CJ(PMU393RUJ(/RJE06L036
8、M/3SLNM6J(SQ36S3Z3PC36LEE/(C9LWEP
