發(fā)布時間：2019-01-25 08:59

【摘要】：目的研究不同Ni含量鐵基激光熔覆層的組織和性能。方法采用CO_2激光器制備了不同Ni含量的鐵基激光熔覆層,通過奧林巴斯光學(xué)顯微鏡、場發(fā)射掃描電鏡、X射線衍射儀及洛氏硬度計等設(shè)備,對激光熔覆層物相、微觀組織及力學(xué)性能進(jìn)行表征。結(jié)果當(dāng)Ni含量為10%~11%時,熔覆層物相主要由γ-Fe相組成,含有少量α-Fe相,洛氏硬度為35.1HRC,熔覆層殘余應(yīng)力宏觀上表現(xiàn)為拉應(yīng)力。當(dāng)Ni含量為6%~7%時,熔覆層物相主要由α-Fe相組成,含有少量γ-Fe相,洛氏硬度為47.9HRC,熔覆層殘余應(yīng)力宏觀上接近平衡狀態(tài)。當(dāng)Ni含量為2%~3%時,熔覆層主要由α-Fe相組成,洛氏硬度為60.3HRC,熔覆層殘余應(yīng)力宏觀上表現(xiàn)為壓應(yīng)力。結(jié)論不同Ni含量熔覆層的物相主要由γ-Fe相和α-Fe相組成,隨著Ni含量的降低,熔覆層中γ-Fe相對應(yīng)的衍射峰強度不斷減弱,而α-Fe相對應(yīng)的衍射峰強度逐漸增強,熔覆層晶粒尺寸減小,表面洛氏硬度增加,殘余應(yīng)力逐漸由拉應(yīng)力轉(zhuǎn)變?yōu)閴簯?yīng)力,能夠有效抑制裂紋的生成,從而獲得高硬度不開裂熔覆層。
[Abstract]:Objective to study the microstructure and properties of iron based laser cladding coating with different Ni content. Methods the Fe-based laser cladding layer with different Ni content was prepared by CO_2 laser. The laser cladding phase was prepared by Olympus optical microscope, field emission scanning electron microscope, X-ray diffractometer and Rockwell hardness tester. Microstructure and mechanical properties were characterized. Results when the content of Ni was 10 ~ 11, the phase of the cladding was mainly composed of 緯-Fe phase, containing a small amount of 偽-Fe phase, and the Rockwell hardness was 35.1HRC. The residual stress of the cladding layer showed tensile stress macroscopically. When the content of Ni is 6 ~ 7, the phase of the cladding layer is mainly composed of 偽-Fe phase, containing a small amount of 緯-Fe phase, and the Rockwell hardness is 47.9 HRC. The residual stress of the cladding layer is close to equilibrium state macroscopically. When the Ni content is 2 ~ 3, the cladding layer is mainly composed of 偽-Fe phase, and the Rockwell hardness is 60.3 HRC. The residual stress of the cladding layer appears to be compressive stress macroscopically. Conclusion the phase of the cladding layer with different Ni content is mainly composed of 緯-Fe phase and 偽-Fe phase. With the decrease of Ni content, the diffraction peak intensity of 緯-Fe phase in the cladding layer decreases continuously, while the diffraction peak intensity corresponding to 偽-Fe phase increases gradually. The grain size of the cladding layer decreases, the surface hardness increases, and the residual stress gradually changes from tensile stress to compressive stress, which can effectively inhibit the formation of cracks and thus obtain the high hardness non-cracking cladding layer.
【作者單位】： 南華大學(xué)機(jī)械工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51474130) 湖南省市聯(lián)合基金重點項目(13JJ8013) 湖南省高校重點實驗室項目(湘財教指[2014]85號) 湖南省重點學(xué)科建設(shè)項目(湘教發(fā)[2011]76號) 湖南省高校科技創(chuàng)新團(tuán)隊支持計劃(湘教通[2012]318號)~~
【分類號】：TG174.4

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