-1的變形條件下，利用Gleeble熱模擬試驗(yàn)機(jī)研究了粉末冶金工藝制備的新型高鎢合金鋼的熱變形行為。結(jié)果表明：高鎢合金鋼的流變應(yīng)力隨應(yīng)變率的降低和變形溫度的升高而降低。構(gòu)建高鎢合金鋼的Arrhenius雙曲正弦函數(shù)本構(gòu)方程及熱加工圖，得到高溫變形激活能為377 kJ/mol，最佳變形工藝參數(shù)區(qū)間為1000~1100 ℃/0.001~0.01 s-1。高溫變形過程中，試樣中有富鎢μ相析出，在變形鼓脹區(qū)有微孔洞與微裂紋產(chǎn)生，數(shù)量隨變形應(yīng)變率的升高和溫度的降低而增加，裂紋沿析出相萌生并擴(kuò)展。同時(shí)μ相的析出提高了合金鋼的高溫強(qiáng)度。;Hot deformation behavior of powder metallurgical high tungsten alloy steel was investigated by Gleeble thermal simulator in a temperature range of 900~1100 °C and a strain rate range of 0.001~1 s-1. The results show that the flow stress decreases with the decrease of strain rate and the increase of deformation temperature. A constitutive equation is derived with Arrhenius hyperbolic sine function, and a processing map is constructed. The activation energy is 377 kJ/mol. The suitable processing regions are 1000~1100 °C/0.001~0.01 s-1. The precipitation of tungsten-rich μ phase occurs during hot deformation process. Microvoids and micro-cracks form in the bulging region of the specimen. The amount of microvoid increases with the increase of strain rate and the decrease of temperature. The μ phase precipitation improves the high temperature strength of the steel."/>