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首页> 外文会议>Researches in Powder Metallurgy >Stainless Steels Sintered form the Mixture of Prealloyed Stainless Steel and Alloying Element Powders
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Stainless Steels Sintered form the Mixture of Prealloyed Stainless Steel and Alloying Element Powders

机译：预烧结不锈钢和合金元素粉末的混合物烧结而成的不锈钢

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The aim of the presented paper is to describe the sintered duplex stainless steels manufactured in sinter-hardening process and their structural and mechanical properties. Duplex stainless steels were obtained through powder metallurgy starting from austenitic 316L or ferritic 410L prealloyed base powders by controlled addition of alloying elements powder. Prepared mixes were compacted at 700MPa and sintered in a vacuum furnace with argon backfilling at temperature of 1240℃ for 1h. After sintering different cooling cycles were applied: rapid cooling (6℃/s) using nitrogen under pressure and slow cooling (0. l℃/s) with furnace in argon atmosphere. Produced sintered duplex stainless steels were studied by scanning and optical microscopy and EDS chemical analysis of microstructure components as well as X-ray analysis. Mechanical properties were studied through tensile and three-point bending tests and Charpy impact test. It was demonstrated that austenitic-ferritic microstructures with regular arrangement of both phases and absence of precipitates can be obtained with properly designed powder mix composition as well as sintering cycle with rapid cooling rate. Produced sintered duplex steels show good mechanical properties which depend on austenite/ferrite ratio in the microstructure and elements partitioning (Cr/Ni) between phases. The optimal mechanical properties were obtained for compositions based on ferritic 410L powder where the balanced distribution of a and y is present and the tensile strength can reach value about 500MPa with 16% of elongation and impact energy about 120J. The precipitations of hard intermetallic σ-FeCr phase take place when sintering with slow cooling cycle what cause substantial decrease of plastic properties, including reduce of elongation to 7% and in particular decrease of impact energy to 68 J.
机译：本文的目的是描述通过烧结硬化工艺制造的烧结双相不锈钢及其结构和机械性能。通过粉末冶金从奥氏体316L或铁素体410L预合金基础粉末开始，通过控制合金元素粉末的添加，获得双相不锈钢。将制得的混合物在700MPa下压实，并在真空炉中进行烧结，并在1240℃的温度下进行氩气回填1h。烧结后，采用不同的冷却循环：在压力下使用氮气快速冷却（6℃/ s），并在氩气气氛中用炉缓慢冷却（0.l℃/ s）。通过扫描和光学显微镜以及微观结构成分的EDS化学分析和X射线分析研究了生产的烧结双相不锈钢。通过拉伸和三点弯曲试验以及夏比冲击试验研究了机械性能。结果表明，采用适当设计的粉末混合物组成以及快速冷却速率的烧结循环，可以获得具有两相规则排列且无沉淀的奥氏体-铁素体显微组织。所生产的烧结双相钢表现出良好的机械性能，这取决于显微组织中的奥氏体/铁素体比率以及相之间的元素分配（Cr / Ni）。对于基于铁素体410L粉末的组合物，可以获得最佳的机械性能，该粉末中存在a和y的平衡分布，拉伸强度可以达到约500MPa的值，伸长率为16％，冲击能约为120J。当以缓慢的冷却周期进行烧结时，会发生硬金属间σ-FeCr相的析出，这导致塑性大幅降低，包括延伸率降低至7％，特别是冲击能降低至68J。

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