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钢的显微偏析的存在,降低了钢的淬透性,使之容易产生软点,因而导致热处理质量不高。钢的区域偏析,用热酸蚀方法很容易判定;而钢的显微偏析往往容易被人忽视,而用一般方法也不易显示出来。用金相方法虽然能够显示出显微偏析,但是对于含炭量的偏析则无法测出,对于某些晶间的偏析也显示不出来;而应用显微硬度就能够准确的测出含炭量的偏析。 (一)试验步骤本法是依据炭素钢及合金结构钢经淬火后马氏体的硬度主要是取决于其含炭量,经过多次试验得出了钢在淬火后的马氏体硬度和显微硬度呈直线关系(见
The existence of micro-segregation of steel, reducing the hardenability of steel, making it easy to produce soft spots, resulting in heat treatment is not high quality. Regional segregation of steel, using thermal etching method is easy to determine; and steel microscopic segregation tends to be overlooked, but with the general method is not easy to show. Metallographic method can show the use of micro-segregation, but the carbon content of the segregation can not be measured for some of the intergranular segregation also did not come out; the application of micro-hardness can accurately measure the carbon content Segregation. (A) test steps This method is based on carbon steel and alloy steel quenched martensite hardness depends mainly on its carbon content, after many tests obtained steel quenched martensitic hardness and significant Microhardness was linear (see