(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 分別研究93W-Ni-Fe d 15 mm擠壓棒坯在1 550 ℃、30 min微波燒結(jié)和1 550 ℃、120 min 傳統(tǒng)氫氣燒結(jié)后燒結(jié)態(tài)的結(jié)構(gòu)及力學(xué)性能，并對兩種燒結(jié)樣品芯部的物相及主要元素含量、相對密度、抗拉強(qiáng)度、硬度和伸長率進(jìn)行測量和分析。結(jié)果表明：微波燒結(jié)樣品中鎢的平均晶粒尺寸比傳統(tǒng)氫氣燒結(jié)的小，粘結(jié)相中的鎢含量比傳統(tǒng)燒結(jié)的高；斷口中部分鎢晶粒與粘結(jié)相之間存在微裂紋；微波燒結(jié)樣品硬度為33.8HRC，略高于傳統(tǒng)氫氣燒結(jié)的硬度，其相對密度、抗拉強(qiáng)度和伸長率與傳統(tǒng)氫氣燒結(jié)的接近；對于大尺寸鎢合金樣品的微波燒結(jié)，需要進(jìn)一步優(yōu)化微波燒結(jié)工藝才能獲得比傳統(tǒng)氫氣燒結(jié)更優(yōu)的結(jié)構(gòu)和力學(xué)性能。
關(guān)鍵字: 93W-Ni-Fe合金；擠壓棒坯；微波燒結(jié)；結(jié)構(gòu)；力學(xué)性能
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The microstructure and mechanical properties of 93W-Ni-Fe powder extruded bars with a diameter of 15 mm sintered via microwave (1 550 ℃, 30 min) and conventional hydrogen (1550 ℃, 120 min) were investigated, respectively. The phases and quantitative analysis of the main elements in the core portion of samples were measured. The relative density, tensile strength, hardness and elongation of the samples were investigated, respectively. The results show that the average grain size of the alloys sintered via microwave sintering is finer and the tungsten content of the alloys is higher than that via conventional hydrogen sintering. Cracks between part of the tungsten grains and the matrix phase are observed on the fracture of the alloy sintered via microwave sintering. The hardness of the alloys sintered via microwave sintering is 33.8HRC, which is a little higher than that via the conventional hydrogen sintering. The relative density, tensile strength and elongation of the alloys sintered via microwave sintering are fairly close to that via the conventional hydrogen sintering. For the tungsten heavy alloys samples with large size, in order to get the better microstructure and mechanical properties than that via the conventional hydrogen sintering, further optimization of the microwave sintering process is required.
Key words: 93W-Ni-Fe alloy; extruded rods; microwave sintering; microstructure; mechanical property
