CAJ | 학술논문

通过在喂料中添加石墨改变注射成形17-4PH不锈钢组织中的碳含量，研究不同碳含量对MIM 17-4PH显微组织和力学性能的影响。结果表明：在烧结态和固溶时效态试样中，碳含量少于0.16%(质量分数)的相组织主要由马氏体和少量的铁素体构成。随着碳含量的逐渐升高，冷却过程中奥氏体未能完全转变成马氏体，组织中出现奥氏体，在碳含量为0.16%的烧结态和固溶时效态试样中，其显微组织为马氏体和奥氏体共同组成的双相组织，而且奥氏体相含量随着碳含量增加而逐渐增加；在碳含量达到0.25%以上时，试样的显微组织完全转变为奥氏体，导致试样的表观硬度下降，抗拉强度下降，伸长率提高。
통과재위료중첨가석묵개변주사성형17-4PH불수강조직중적탄함량，연구불동탄함량대MIM 17-4PH현미조직화역학성능적영향。결과표명：재소결태화고용시효태시양중，탄함량소우0.16%(질량분수)적상조직주요유마씨체화소량적철소체구성。수착탄함량적축점승고，냉각과정중오씨체미능완전전변성마씨체，조직중출현오씨체，재탄함량위0.16%적소결태화고용시효태시양중，기현미조직위마씨체화오씨체공동조성적쌍상조직，이차오씨체상함량수착탄함량증가이축점증가；재탄함량체도0.25%이상시，시양적현미조직완전전변위오씨체，도치시양적표관경도하강，항랍강도하강，신장솔제고。
Graphite was added into the 17-4PH stainless steel to vary the carbon content. The effect of carbon content on the microstructure and mechanical properties of metal injection molded 17-4PH stainless steel was investigated. The results show that the samples by solid solution and aging treatment, mainly consist of martensite and a small amount of ferrite at carbon content less than 0.16%. Austenite fails to completely transform into martensite in the cooling process and the amount of austenite increases gradually with the carbon content increasing. The samples consist of both martensite and austenite at carbon content of 0.16%. Then, the samples mainly consist of austenite when carbon content is more than 0.25%. This leads to a decrease in hardness and tensile strength, while the elongation increases.