熱處理對MIM 17-4PH不銹鋼組織和性能的影響

熱處理對MIM 17-4PH不銹鋼組織和性能的影響The influence of heat treatment on the microstructure and mechanical properties of MIM 17-4PH stainless steel

采用高壓水氣聯合霧化粉末和熱塑性粘結劑制備的金屬注射成型17-4PH不銹鋼,經過真空燒結以及熱處理后,對其進行硬度檢測、金相分析以及鹽霧試驗等.結果表明：MIM 17-4PH不銹鋼燒結組織主要由板條馬氏體和塊狀鐵素體組成,硬度為24HRC,鹽霧試驗12h出現腐蝕斑點;經過1040℃固溶處理后,材料硬度增至29HRC,鹽霧腐蝕24h未出現腐蝕斑點;燒結后直接進行480℃時效,第二相粒子析出并彌散分布在基體中,材料硬度提高到38HRC,但鹽霧腐蝕8h就出現腐蝕斑點.

The 17-4PH stainless steel was prepared by metal injection molding technology with atomized powder and thermoplastic adhesive.Through vacuum sintering and heat treatment after sintering,the samples were analyzed through hardness,metallographic analysis and salt spray.The result shows that：the microstructure of sintered MIM 17-4PH stainless steel is mainly composed of lath martensite and clumpy ferrite,and the hardness is 24 HRC,and there are some corrosion spots after 12 hsalt spry test.After solid solution treatment at 1040℃,the hardness increases to 29 HRC,and there is no corrosion spot after 24h salt spry test.After ageing at 480℃,the second phase particles is precipitated,dispersed in the matrix.The hardness increases to 38 HRC and there are some corrosion spots after 8h salt spry test.

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