陕西理工学院学报（自然科学版）
陝西理工學院學報（自然科學版）
협서리공학원학보（자연과학판）
JOURNAL OF SHAANXI UNIVERSITY OF TECHNOLOGY （NATURAL SCIENCE EDITION）
2013年
6期
6-10,24
,共6页
激光熔覆%SYSWELD%应力场%残余应力
激光鎔覆%SYSWELD%應力場%殘餘應力
격광용복%SYSWELD%응력장%잔여응력
laser cladding%SYSWELD%stress field%residual stress
为了分析Co基合金熔覆过程的应力场，建立了激光熔覆预置Co基合金粉末过程的三维模型，考虑温度变化对热物理参数的影响以及表面对流换热和辐射散热等影响因素，使用SYSWELD软件分析了激光熔覆过程中的应力场，并进行了试验验证。结果表明：通过比较分析扫描速度为5 mm/s的涂层获得良好的冶金结合；工件残余应力均为拉应力，且最大值出现在z向距表面约2 mm处，最大变形量出现在工件的边缘位置；随扫描速度的增加，工件的残余应力和变形均明显减小，这说明在其它工艺参数一定的前提下，适当降低扫描速度，能有效减小熔覆层的应力集中，获得质量优异的涂层。模拟结果为激光熔覆过程的工业化提供了理论依据。
為瞭分析Co基閤金鎔覆過程的應力場，建立瞭激光鎔覆預置Co基閤金粉末過程的三維模型，攷慮溫度變化對熱物理參數的影響以及錶麵對流換熱和輻射散熱等影響因素，使用SYSWELD軟件分析瞭激光鎔覆過程中的應力場，併進行瞭試驗驗證。結果錶明：通過比較分析掃描速度為5 mm/s的塗層穫得良好的冶金結閤；工件殘餘應力均為拉應力，且最大值齣現在z嚮距錶麵約2 mm處，最大變形量齣現在工件的邊緣位置；隨掃描速度的增加，工件的殘餘應力和變形均明顯減小，這說明在其它工藝參數一定的前提下，適噹降低掃描速度，能有效減小鎔覆層的應力集中，穫得質量優異的塗層。模擬結果為激光鎔覆過程的工業化提供瞭理論依據。
위료분석Co기합금용복과정적응력장，건립료격광용복예치Co기합금분말과정적삼유모형，고필온도변화대열물리삼수적영향이급표면대류환열화복사산열등영향인소，사용SYSWELD연건분석료격광용복과정중적응력장，병진행료시험험증。결과표명：통과비교분석소묘속도위5 mm/s적도층획득량호적야금결합；공건잔여응력균위랍응력，차최대치출현재z향거표면약2 mm처，최대변형량출현재공건적변연위치；수소묘속도적증가，공건적잔여응력화변형균명현감소，저설명재기타공예삼수일정적전제하，괄당강저소묘속도，능유효감소용복층적응력집중，획득질량우이적도층。모의결과위격광용복과정적공업화제공료이론의거。
In order to analyze stress field of Co-based alloys laser cladding , a three-dimensional (3D) physical model of Co-based alloys laser cladding with preset-powder method has been made on low carbon steel substrate by finite element method , and the thermo-physical properties established as the functions of tempera-ture, the surface convective heat transfer , and the radiant heat transfer were taken into consideration .The stress field of laser cladding process was analyzed by SYSWELD software .A 5 kW CO2 laser was used to pre-pare Co-based alloy coatings on low carbon steel substrate .Dilution rate of the coating were examined .The re-sults showed that favorable metallurgy bonding of coatings with scanning velocity of 5 mm/s was obtained by comparison and analysis .Residual stress of work-piece was all tensile stress , and the maximum appeared at the distance of 2 mm from the surface in the z direction , and the residual distortion and stress of work-piece were all obviously decreased with lower scanning speed .With the same other process parameters , stress con-centration of coatings was effectively reduced by the proper scanning speed , and quality excellent coatings could be obtained .The simulated result provided the theoretical basis for the industrialization of the laser clad-ding.
