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One container of double-quenching method


The whereabouts of the medium layer acceleration (ignoring acceleration effects produced by penetration resistance). Located in the upper parts of the whereabouts of media time t, h is the height of the upper medium is: = Ji = {g (1 No.) (2) where t is the workpiece from the quenching temperature cooled to a temperature above the time by the ability to determine the upper cooling medium. 4, the choice of cooling medium commonly used in the upper coolant water or salt water use, the greater the cooling rate to obtain greater than the cooling rate, while the tip of the nose through the c curve, you should enter the lower the cooling capacity of small media,[link widoczny dla zalogowanych], for a smaller cooling speed. Therefore, the lower the critical cooling medium is selected, it shall meet the following requirements; ① density greater than water} ② have lower thermal conductivity effect; ⑧ insoluble in water and stability on the water; ④ have a higher boiling point and flash point; ⑤ have high chemical stability; ⑧ non-toxic and tasteless; ⑦ little corrosion on the workpiece; ⑧ do not pollute the environment. By experiment and observation, the last more than ten kinds of media, from the available identified two types of media (an organic acid; the other is the silicone polymer) for the quenching test, its performance is shown in Table l. Both declined a medium sweet wine and the selection of the organic target density silicone polymer thermal conductivity l I l revolves Chuang Yi flash point with the brush point caries cm. 25 ℃) i (W / m · ℃) l (Pa · s, 25 ℃) l (℃) l (℃) l (℃) 1.12I12l0.02l300l a poly {01301.1l8l0.1735d have a quality of all 18300 colorless transparent liquid, no toxicity. Silicone polymer is superior to organic esters, but the former is expensive. Quenching the sample selection and testing of materials selection and low hardenability of three materials (20Cr, 35SiMn, T13) quenching test, the sample size is # 15 × 15 (ram). For its complex shape of the workpiece,[link widoczny dla zalogowanych], easily deformed crack. Can be obtained from the manual inspection of the three materials, quenching temperature and Ms point,[link widoczny dla zalogowanych], and water and salt water cooled 5 speed, you can draw them from the quenching temperature dropped to a temperature above the Ms point of time, using equation (2 ) get the upper medium (water or 5 salt water) in height. Salt water, and 5 in accordance with the calculated height of the water and organic esters and organic silicon polymer layer, respectively, quenching medium for quenching the composition test, and the other with water or salt water for 5 to compare single-agent quenching. Table 2 is the hardness of the three materials after quenching the sample test results. Section 2 of three wood decay samples quenched in different media, the hardness (HRC average) elliptical machine 5 salt water alcohol 『Xiao Cheng 20cr49.5l49l50.5l5. l49.5505; 5M53.5l53I54.5l54.5l53554.5T13g3.5f63J64.5l64l635 \3-inch circle 3 feet quenched samples quenched in different media, the results of the cracking statistics (number) 5 Po machine sugar salt water demand of a 5 l5 salt water salt water alcohol from an organic silicone polymer sleeve 20Cr no no no l j No No 35 $ JM ~ I no I no 10f10T13 No 7 No No {no 7 Conclusion (1) by testing the preliminary view that a single container double-quenching method is feasible, than the commonly used double-quenching method is simple. (2) This hardening process to be further in the actual production proof test, in particular,[link widoczny dla zalogowanych], is the application of the conditions and scope of the testing demonstration. thanks j the party hit of by Professor Zhang Jishi guidance, Zhao-Yuan, Ma Jinhuai students to do a lot of work and testing, in which grateful to . (I-continued on page 42) mixed grain size, or ferrite grain size, this will give the test and the austenite grain size is difficult to bring ratings, and even draw the wrong conclusions. References: [ ,],[-1977 [7] Jiang Jinwen and so on. on the austenite grain size determination of the nature of the discussion of [the Chinese Society of barrier is the first annual meeting of special steel, paper [c], 1979.Is] Qiqihar Steel wide pilot room. Several shows the austenite grain in steel Methods [J],[link widoczny dla zalogowanych], Physical examination Zha (sleeve Management Volume), 1974, (6): 23. [g] Xining wide steel laboratory showed Albright virtual methods of grain In Nuo ]. metallurgical industry standard platform base country village grain paper [c], 1975. \
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