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滲碳鋼加熱工藝參數對淬火組織的影響

時間:2019-04-08 10:09來源:畢業論文
介紹了18CrMnTi滲碳零件加熱工藝參數對淬火組織的影響。分別研究了鋼滲碳緩冷狀態和滲碳樣品淬火后的表層組織、過渡組織以及心部組織的組織變化和硬度變化。淬火工藝參數定為:淬

摘要:本文介紹了18CrMnTi滲碳零件加熱工藝參數對淬火組織的影響。分別研究了鋼滲碳緩冷狀態和滲碳樣品淬火后的表層組織、過渡組織以及心部組織的組織變化和硬度變化。淬火工藝參數定為:淬火溫度定為770℃、800℃、830℃和860℃,保溫時間定為25min。結果顯示原始滲碳緩冷試樣的組織為表層為珠光體,過渡層是珠光體加鐵素體,越靠近心部鐵素體越多珠光體越少,心部是也是珠光體加鐵素體;770℃和800℃淬火后試樣的表層組織為高碳馬氏體加少量殘余奧氏體,過渡層組織為馬氏體加鐵素體再加少量殘余奧氏體,且越靠近心部鐵素體含量逐漸增多,心部組織為低碳馬氏體加鐵素體再加少量殘余奧氏體;而830℃和860℃淬火試樣的整個截面上都是馬氏體組織。原始滲碳緩冷試樣的表層最高硬度為420.6Hv,滲碳層深度是1.3mm,770℃、800℃、830℃和860℃淬火試樣表層最高硬度分別是819.7Hv、839.5Hv、928.1Hv和834.1Hv,淬硬層深度分別是1.8mm、1.9mm、2.0mm和1.8mm。34390
畢業論文關鍵詞: 滲碳;18CrMnTi;淬火
Influence of heating process parameters of carburizing steel on Microstructure of quenching
Abstract:This article describes the impact 18CrMnTi carburizing parts heating process parameters on the hardened structure. Studied the organizational changes and changes in the surface structure of the steel hardness carburizing and carburizing slow cold state sample after quenching, the transition of organizations and heart tissue. Quenching process parameters as: quenching temperature to 770 ℃, 800 ℃, 830 ℃ and 860 ℃, holding time set at 25min. The results showed that the original carburizing slow cooling of the sample surface for pearlite organization, transition pearlite and ferrite, closer to the more central portion of ferrite pearlite fewer, the center is also pearlite plus ferrite body; skin tissue after 770 ℃ and samples quenched at 800 ℃ high carbon martensite plus a small amount of residual austenite transition martensite plus ferrite plus a small amount of residual austenite and closer to the heart Ministry of ferrite content gradually increased, the center organized a low carbon martensite and ferrite plus a small amount of residual austenite; and the entire cross-section of martensite are 830 ℃ and 860 ℃ and quenching. Original carburizing slow cooling of the sample surface up to a hardness of 420.6Hv, case depth is 1.3mm, 770 ℃, 800 ℃, the surface 830 ℃ and 860 ℃ quenching, the maximum hardness are 819.7Hv, 839.5Hv, 928.1Hv and 834.1Hv, hardened layer depth, respectively 1.8mm, 1.9mm, 2.0mm and 1.8mm.
源¥自%六:維;論-文'網=www.aftnzs.live

Key Words: Carburization; 18CrMnTi; Quench
 目錄
1 緒論    1
1.1滲碳鋼簡介    1
1.2 滲碳件一般加工工藝路線    1
1.3 滲碳的介紹    1
1.4 滲碳零件淬火的作用    2
1.5 課題現狀    2
1.6 選題的目的和意義    4
2 實驗材料及實驗方法    5
2.1 實驗材料    5
2.1.1 滲碳鋼的成分    5
2.1.2 滲碳鋼的加熱臨界溫度    6
2.1.3 滲碳樣品形狀尺寸    6
2.2 實驗方法    6
2.2.1 原始樣品的金相制樣    6
2.2.2 原始樣品的金相觀察    6
2.2.3 滲碳樣品淬火工藝參數    7
2.2.4 淬火后試樣的金相制樣    7
2.2.5 淬火后試樣的金相觀察    7
2.2.6 原始樣品及淬火后樣品的硬度測定    7
2.3 實驗用料及儀器    10
3 實驗結果及分析    11
3.1 原始滲碳緩冷樣品的組織分析    11
3.2 原始試樣的硬度分析    13 滲碳鋼加熱工藝參數對淬火組織的影響:http://www.aftnzs.live/cailiao/20190408/31872.html
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