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粉末冶金高溫合金FGH96的熱加工圖及熱壓縮變形過程的開裂行為
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-10-31
采用Gleeble3180D型熱模擬試驗機(jī)對熱擠壓態(tài)FGH96合金在變形溫度1020~1140 ℃，應(yīng)變速率0.001~1.0 s-1進(jìn)行熱壓縮實驗，分析真應(yīng)力-真應(yīng)變曲線，繪制熱加工圖。并針對熱擠壓態(tài)粉末冶金高溫合金FGH96在熱壓縮溫度低于1080 ℃時的開裂現(xiàn)象，利用熱模擬壓縮實驗方法，確定在變形溫度為1050 ℃、應(yīng)變速率為0.001~1.0 s-1的熱壓縮變形過程中的開裂臨界應(yīng)變量，觀察變形后試樣的裂紋形貌和顯微組織，并利用有限元分析方法對熱壓縮變形過程進(jìn)行模擬。
粉末冶金高溫合金FGH96的熱加工圖及熱壓縮變形過程的開裂行為Processing map and cracking behavior ofpowder metallurgy superalloy FGH96 during hot compression
采用Gleeble3180D型熱模擬試驗機(jī)對熱擠壓態(tài)FGH96合金在變形溫度1020~1140 ℃，應(yīng)變速率0.001~1.0 s-1進(jìn)行熱壓縮實驗，分析真應(yīng)力-真應(yīng)變曲線，繪制熱加工圖。并針對熱擠壓態(tài)粉末冶金高溫合金FGH96在熱壓縮溫度低于1080 ℃時的開裂現(xiàn)象，利用熱模擬壓縮實驗方法，確定在變形溫度為1050 ℃、應(yīng)變速率為0.001~1.0 s-1的熱壓縮變形過程中的開裂臨界應(yīng)變量，觀察變形后試樣的裂紋形貌和顯微組織，并利用有限元分析方法對熱壓縮變形過程進(jìn)行模擬。結(jié)果表明：試樣中部位置受拉應(yīng)力作用沿著變形方向產(chǎn)生鼓形變形，當(dāng)達(dá)到臨界應(yīng)變量后，產(chǎn)生呈沿晶斷裂的宏觀裂紋，并且隨著應(yīng)變速率的減小，裂紋產(chǎn)生的臨界應(yīng)變量逐漸減小；在低應(yīng)變速率條件下，在宏觀裂紋產(chǎn)生之前，試樣內(nèi)部晶粒之間出現(xiàn)了微觀開裂的現(xiàn)象，并造成應(yīng)力下降。
The hot compression tests were carried out for hot extruded FGH96 alloy in the temperature range of 1020-1140℃and strain rate range of 0.001-1.0 s-1?by using Gleeble 3180D thermal simulation system. The true stress-true strain curves were analyzed, and the processing maps were developed. And for the phenomenon that the hot extruded powder metallurgy superalloy FGH96 cracked severely at the hot compression temperatures below 1080 ℃, the critical strains of cracking were determined during hot compression at deformation temperature of 1050 ℃ and strain rates of 0.001-1.0 s-1. The fractures and microstructures of deformed specimens were observed, and the hot compression was simulated by using finite elemental method. The results show that the specimens occur barrel deformation that is affected by tensile stresses in the middle of specimens, beyond the critical strains of cracking, fractures form with intergranular cracks, and the critical strains increase with increasing the strain rate. At low strain rate, the micro-cracks form between inner grains before formation of macro-fractures, and the flow stress decreases.
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