1. Serious work hardening. Austenitic stainless steel will undergo severe hardening during processing, which is also extremely prominent. The yield limit will gradually increase, and the depth of the work-hardened layer will reach 1/3 of the original cutting process during processing, and in terms of hardness, it will also be 1.4 times harder than the original. This is because austenitic stainless steel. Its own plasticity is relatively large, so that the lattice will be distorted when plastically deformed, and the strengthening coefficient is also very large.
In this case, the austenite is extremely unstable, so under the influence of cutting stress, a large part of austenite will become martensite, and then mixed with some compound impurities. It will show a state of dispersion, which will lead to the hardening of the cutting process and the emergence of a hardened layer. If a hardened layer appears in the previous process, it will seriously affect the development of the subsequent process and make the milling process of austenitic stainless steel. The smooth progress was severely hampered.
2. The cutting force is large. Austenitic stainless steel is very prone to plastic deformation in the current processing process, which will increase the cutting force, and austenitic stainless steel has higher thermal strength in the case of severe work hardening, which will further increase. Cutting resistance, under the action of cutting resistance, the curling of chips is also extremely difficult. In this case, the cutting force of the austenitic stainless steel milling process is extremely large, which will be 25% higher than that of 45 steel.
3. The cutting temperature is high. During the milling process of austenitic stainless steel, plastic deformation will occur during cutting, and there will be great friction with the tool, so the heat of cutting will increase, because the thermal conductivity of stainless steel itself is 45 steel. 1/2 of the cutting heat, which results in a lot of cutting heat concentrated on the contact surface between the milling cutter and the cutting area. The heat dissipation conditions in this area are extremely poor. Under the same conditions, the cutting temperature of 1Cr18Ni9Ti is relatively For 45 steel, it will be about 200 ℃ higher.
