Alloying element and its content are right the influence of function of cladding of frit of laser of iron radical alloy

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Laser frit Fu (also call laser v) it is to show with different accretion the method is in the coating material that is gone up to place an option by the matrix of frit Fu, after classics laser irradiation, make surface of the sum matrix fused, classics is fast and caky the process of the exterior coating that forms the ﹑ that low dilute spends and matrix to show metallurgy to be united in wedlock. With traditional finishing technique, if eletroplate to wait for photograph comparing with hot gush solder, technology of laser frit Fu has frit cladding grain petty, hot influence area and heat are out of shape the area is small wait for an advantage. The author studied in document carbolic element content is right the influence of function of layer of v of laser of iron radical alloy, obtained the frit cladding with tall flawless hardness. The function of because alloying element is right steely material is having main effect likewise, reason studies in the article alloying element is right further the influence of function of cladding of frit of laser of iron radical alloy, so that acquire different property (be like different hardness) the manufacturing need with frit contented and different cladding. 1 test data and experiment of Fu of methodological laser frit use the ROFIN TR050 that German Rofin company makes fast axis to shed CO2 laser. In experimental process, laser power is 3.

5KW, wavelengh of laser light beam is 10.

6 μ M; uses ablation law to measure facula diameter, leave anxious amount through adjusting, make diameter of the facula in experiment process uses only way monolayer for 4mm; beforehand Fu of frit of buy type laser, beforehand the pulverous ply of buy is 1.

Rate of 5mm; laser scanning all is 30mm; to use Ar to regard protection as gas for 6mm/s scanning length, basically use at preventing alloyed powder end to produce oxidation in frit Fu process, ar throughput is 3.

6L/min. Base material uses A3 steel, dimension is 100mmx40mmx5mm, exterior pickling goes becoming rusty, clean clean with acetone, next stoving reserves. The experiment uses the Fe202 of alloyed powder end with better performance to regard a foundation as alloy, this pink contains Fe-Ni-Cr-B-Si-C alloy for 150~200 purpose, chemical composition (quality mark, %) is 92.

7Fe, 3Ni, 2Cr, 1B, 1Si, 0.

3C. Result of test of laser frit Fu makes clear, use Fe202 alloy powder to use noodles or vermicelli made from bean or sweet potato starch as frit Fu, can obtain the iron with tall flawless hardness base laser frit cladding. Add the Ni of different content, Cr and Mo respectively in Fe202, in order to study all sorts of alloying element and its content (quality mark) the influence rule to frit cladding function. Add pure alloying element to be able to mix equably with former alloy powder to let place, achieve certain alloy to change rate, undertake compound alloy powder batch mixing is handled through mechanical ball mill first. Its handle craft to be: The ball grinds time to be 10h, grind the hard alloy ball that the ball controls for Φ 10mm, grind ball and the quality scale with pulverous alloy to be 5:1, the thinner when the ball is ground is right amount and anhydrous alcohol. The powder after the ball is ground is in 2h of 100 ℃ drying, next sift out is stand-by. Use Rockwell hardness plan detect the exterior hardness of cladding of all sorts of composition alloy frit; Use law of X ray diffraction to determine the leftover austenite in each frit cladding (AR) quantity; Use enlarge fold to observe and measure a number of crackle and length for the stereomicroscope of 10 times; The craze sensitivity of frit cladding α gets through measuring the crack length inside unit area, li/A of α = ∑ , li is I the length of crackle (Mm) , the area that A is frit cladding (Cm2) . 2 tests result and analysis 2.

If the graph is shown 1 times,1 alloying element and content reach the its content influence to hardness of frit cladding surface to the influence alloying element of frit cladding hardness. Knowable, ni can reduce the hardness of frit cladding, the content that follow Ni increases, the hardness of frit cladding begins to drop smoothly after;Ni content exceeds 7% , frit cladding hardness drops quickly it is OK that a few; grounds add Cr the hardness that appreciably increases frit cladding, but Cr content exceeds 4.

6% when the hardness appreciably of H+ frit cladding drops, when the content of Cr increases further, the hardness of frit cladding has more apparent drop, but drop extent increases along with Mo content without Ni big; , the hardness of frit cladding increases, but Mo content exceeds 5.

75 when, the hardness of frit cladding drops, when Mo content increases further, the hardness of frit cladding did not change apparently. Because the change of quantity of the AR in frit cladding is caused,alloying element basically is to the influence of frit cladding hardness, because AR hardness is low, if the AR in frit cladding increases more, criterion frit cladding hardness can drop somewhat, and change of alloying element content is measured to frit cladding AR (bulk mark) the influence sees) of graph 2(actual measurement. 2.

The influence alloying element to sensitivity of frit cladding craze is opposite 2 alloying element and content the influence of sensitivity of frit cladding craze is shown 3 times like the graph, because use the frit cladding that preparation of Fe202 alloyed powder end gets to do not have crackle, visible (no matter 1) adds element of how many Ni to cannot make frit cladding produces crackle. Because Ni element can increase the AR amount in frit cladding, it is due the effect that reduces sensitivity of frit cladding craze, song Wulin's research also proved this is nodded. Although because sample size is relatively lesser,be in in this experiment, the frit cladding itself that did not add Ni element is flawless, did not reflect the significant effect of Ni element so, but if be to be in frit Fu condition is more abominable, than be in so frit cladding cooling rate bigger or all round below the case with cabined more complex stress, should reflect this one effect of Ni element. (2) the addition as Cr element content, the craze sensitivity of frit cladding increases, but be achieved when Cr element content and exceed 9.

8% when, because AR measures urgent leap to add, reduced sensitivity of frit cladding craze, frit cladding does not produce crackle. 2.

The affects AR presence that 3 alloying element and content measure to frit cladding AR and its content are opposite undoubtedly the hardness of frit cladding and craze sensitivity are having main effect. By the graph knowable (1) the addition as Ni content, quantity of the AR in frit cladding increases, become the addition of;(2) of direct proportion relation as Cr content almost, quantity of the AR in frit cladding increases at first slow, increase what very fast;(3) measures as Mo subsequently, the AR volume in frit cladding is slow increase. The AR in frit cladding is measured increase along with the addition of Ni, Cr and Mo content, because these alloying element reduced Mf of temperature of martensite change cease,be, and the on any account that Mf chooses decided steel quenchs to room temperature the AR when is measured. The 3 conclusion addition as Ni content, quantity of the AR in frit cladding increases, hardness drops, craze sensitivity is changeless the; addition as Cr content, quantity of the AR in frit cladding increases, hardness is appreciably increases first, drop next, sensitivity of frit cladding craze is to increase first, drop next, as the addition of Mo content, volume of the AR in frit cladding is slow increase, frit cladding hardness is to increase first, drop next, keep basically finally changeless, sensitivity of frit cladding craze increases continuously. CNC Milling CNC Machining