表面技术
錶麵技術
표면기술
Surface Technology
2015年
10期
68-73
,共6页
32 Cr2 Mo2 NiVNb钢%盐浴氮化%金相组织%力学性能%耐蚀性%高温耐磨性
32 Cr2 Mo2 NiVNb鋼%鹽浴氮化%金相組織%力學性能%耐蝕性%高溫耐磨性
32 Cr2 Mo2 NiVNb강%염욕담화%금상조직%역학성능%내식성%고온내마성
32Cr2Mo2NiVNb steel%salt-bath nitriding%microstructure%mechanical property%corrosion resistance%high-tem-perature wear resistance
目的：将盐浴氮化工艺用于32 Cr2 Mo2 NiVNb钢的表面处理。方法采用盐浴氮化工艺处理32 Cr2 Mo2 NiVNb钢,通过对金相组织、力学性能、断口形貌、耐蚀性能、高温耐磨性能等的测试分析,研究该工艺对32 Cr2 Mo2 NiVNb钢组织和性能的影响,验证该工艺对32 Cr2 Mo2 NiVNb 钢的适用性。结果32 Cr2 Mo2 NiVNb钢盐浴氮化后,基体组织为均匀的细针状索氏体+少量游离铁素体,渗氮层深度约为0.23 mm,化合物层深度均匀,约为17μm,渗氮层疏松度、氮化物、脆性评级均达到1级；表面硬度为1011 HV0.3,较氮化前提高153.4%；抗拉强度、拉伸断口形貌均无明显变化,断后伸长率、断面收缩率、冲击吸收能量仅小幅降低；耐中性盐雾时间为镀硬铬试样的6.3倍；经190 s高温磨损的表面磨痕细小均匀,磨损失重较镀硬铬试样降低62.8%。结论盐浴氮化工艺不损害32 Cr2 Mo2 NiVNb钢组织、强度等,仅使塑性、韧性指标小幅降低,相较于镀硬铬工艺,可显著提高32 Cr2 Mo2 NiVNb钢的耐蚀性、高温耐磨性,对32 Cr2 Mo2 NiVNb钢的工艺适用性良好。
目的：將鹽浴氮化工藝用于32 Cr2 Mo2 NiVNb鋼的錶麵處理。方法採用鹽浴氮化工藝處理32 Cr2 Mo2 NiVNb鋼,通過對金相組織、力學性能、斷口形貌、耐蝕性能、高溫耐磨性能等的測試分析,研究該工藝對32 Cr2 Mo2 NiVNb鋼組織和性能的影響,驗證該工藝對32 Cr2 Mo2 NiVNb 鋼的適用性。結果32 Cr2 Mo2 NiVNb鋼鹽浴氮化後,基體組織為均勻的細針狀索氏體+少量遊離鐵素體,滲氮層深度約為0.23 mm,化閤物層深度均勻,約為17μm,滲氮層疏鬆度、氮化物、脆性評級均達到1級；錶麵硬度為1011 HV0.3,較氮化前提高153.4%；抗拉彊度、拉伸斷口形貌均無明顯變化,斷後伸長率、斷麵收縮率、遲擊吸收能量僅小幅降低；耐中性鹽霧時間為鍍硬鉻試樣的6.3倍；經190 s高溫磨損的錶麵磨痕細小均勻,磨損失重較鍍硬鉻試樣降低62.8%。結論鹽浴氮化工藝不損害32 Cr2 Mo2 NiVNb鋼組織、彊度等,僅使塑性、韌性指標小幅降低,相較于鍍硬鉻工藝,可顯著提高32 Cr2 Mo2 NiVNb鋼的耐蝕性、高溫耐磨性,對32 Cr2 Mo2 NiVNb鋼的工藝適用性良好。
목적：장염욕담화공예용우32 Cr2 Mo2 NiVNb강적표면처리。방법채용염욕담화공예처리32 Cr2 Mo2 NiVNb강,통과대금상조직、역학성능、단구형모、내식성능、고온내마성능등적측시분석,연구해공예대32 Cr2 Mo2 NiVNb강조직화성능적영향,험증해공예대32 Cr2 Mo2 NiVNb 강적괄용성。결과32 Cr2 Mo2 NiVNb강염욕담화후,기체조직위균균적세침상색씨체+소량유리철소체,삼담층심도약위0.23 mm,화합물층심도균균,약위17μm,삼담층소송도、담화물、취성평급균체도1급；표면경도위1011 HV0.3,교담화전제고153.4%；항랍강도、랍신단구형모균무명현변화,단후신장솔、단면수축솔、충격흡수능량부소폭강저；내중성염무시간위도경락시양적6.3배；경190 s고온마손적표면마흔세소균균,마손실중교도경락시양강저62.8%。결론염욕담화공예불손해32 Cr2 Mo2 NiVNb강조직、강도등,부사소성、인성지표소폭강저,상교우도경락공예,가현저제고32 Cr2 Mo2 NiVNb강적내식성、고온내마성,대32 Cr2 Mo2 NiVNb강적공예괄용성량호。
Objective To develop a new salt-bath nitriding process for 32Cr2Mo2NiVNb steel surface treatment. Methods The 32Cr2Mo2NiVNb steel was treated with the new salt-bath nitriding process. The influences of the new salt-bath nitriding process on the microstructure and mechanical properties of 32Cr2Mo2NiVNb steel were concluded based on the analysis of several tests such as salt spray test and hardness test. The applicability of the salt-bath nitriding process for 32Cr2Mo2NiVNb steel was verified in this paper. Results After the salt-bath nitriding process, the 32Cr2Mo2NiVNb base material was composed of uniform fine needle-like sorbite + small amount of free ferrite, the depth of the nitriding layer was about 0. 23 mm, and the compound layer showed an even thickness of about 17μm. The level of the brittleness, nervation and wave-like nitrid, porosity of nitrided case all reached grade I. The hardness of 32Cr2Mo2NiVNb steel surface after salt-bath nitriding treatment was 1011HV0. 3, which was 250% of the surface hardness without salt-bath nitriding treatment. The tensile strength and the fracture morphology showed no significant change after salt-bath nitriding treatment. The tensile length after fracture, the reduction of cross-section area and impact absorption energy were slightly decreased. The time of resistance to neutral salt spray was 6. 3 fold as high as that of the sample coated with hard chromi-um. The surface wear scars after wear at high temperature for 190 s were fine and uniform, and the wear weight loss was reduced by 62. 8% as compared to the sample coated with hard chromium. Conclusion The salt-bath nitriding process did not damage the microstructure and mechanical properties of 32Cr2Mo2NiVNb steel, with only slight decreased in plasticity and toughness indexes, and could significantly improve the corrosion resistance and high-temperature wear resistance of 32Cr2Mo2NiVNb steel as compared to hard chromium plating. The new salt-bath nitriding process was well suitable for surface treatment of 32Cr2Mo2NiVNb steel.
