Effect Of Heat Treatment On Microstructure And Properties Of Bi-metal Composite Hammer

Hammer crusher is a crushing equipment which widely used in energyindustries，the hammer head is the most important working parts. Traditional singlewear-resistant materials such as wear-resistant alloy steel high manganese steel，although it has good impact toughness, its wear resistance is low, which causing thehammer head by wear and tear, failure in the short term; Second traditional hammerhead made of high chromium cast iron, although it has good abrasion resistance, butits impact toughness is low, which causes the hammer head often appears aphenomenon brittle fracture and dropping small pieces in the early days. And bi-metalcomposite material, can make different parts of the same component meets theperformance requirements at the same time.In order to improve the service life and the safety performance of the hammerhead, reduce the production cost and reduce material waste. This topic using EPCprocess to product hammer crusher hammers. According to the performancerequirements and the working condition, designs the heat treatment process for thebimetal composite hammer head; Respectively to study the carbon in low alloy steelunder the conditions of different heat treatment process and the change rule of themicrostructure and properties of high chromium cast iron. Eventually I willintegration the best heat treatment process which belongs to two kinds of material asone process. Subsequently, testing and checking of the wear resistance and oxidationresistance under the heat treatment process. At last, I will observe the size anddistribution of secondary carbides by scanning electron microscope, to explore theinfluence of the carbide distribution morphology and amount of precipitation on highchromium cast iron secondary carbides under different heat treatment conditions, andthe secondary carbides affect the performance of hammer head wear resistance, it isconcluded that the best heat treatment process parameters.Detect the phase of sample through X-ray diffraction, shows that high chromiumcast iron separates out main carbide which is M7C3carbide in the early, the vickershardness up to HV1760after heat treatment, this kind of carbide is the main abrasionresistance of high chromium cast iron. The high chromium cast iron parts-wear parts of Hammer head which the rockwell hardness value is HRC60~63, alloy steel partthat is connected to the hammer handle which the hardness value is HRC40~50,shock absorption function is15~40J. Assessment of tensile test results show that thefractures are always appeared in the far away from the joint surface alloy steel side,illustrate that strong interface combination. The grinding machine and the dynamicload of abrasive wear tester of the wear test, it is concluded that the experiment ofthree kinds of material sliding wear resistance from high to low in turn for highchromium cast iron, the experiment of carbon steel, high manganese steel, secondlythe impact of the high chromium cast iron wear performance for2.0~2.5times thatof high manganese steel,1.3~1.5times for the experiment of carbon steel.