Study On Quenching Process Of High Hardness Of The Wheel Surface

With the development of modern science and technology, industry accelerates the pace of entering the 4.0 age, while the capacity of independent innovation ability remains very poor in today’s China, there are still many blind spots in terms of design and development of crane wheels. Moreover, the Asian Infrastructure Investment Bank, which opened this year, also brings crane manufacturing a daunting challenge. In the service time, wheels should not only meet the normal mechanical properties, but also satisfy a series of performance requirements, for instance, abrasion resistance, corrosion resistance, low temperature toughness and thermal conductivity.As a new way of surface heat treatment, induction hardening only transmits heat to work-piece surface through the induction winding, compared to traditional heating mode, it has many advantages such as fast heating, high efficiency, energy saving and pollution-free, this method will find significant development in the field of surface heat treatment. However, the heating mechanism of induction hardening is complicated, the domestic researching is not yet mature.In this research, end-quenching tests are carried out on three kinds of wheel steel materials, namely 42 Cr Mo, 65 Mn, and CL60; by using water and organic solution(8%UCON solution), hardness distribution curves will be obtained, then the depth of hardening zone will be investigated on the basis of hardness size and distribution. Finally, cooling performance of two kinds of cooling mediums, hardness distributions of three steel materials that are concluded under the same cooling medium after quenching will be compared.The main content of this study is to detect the hardness distribution, micro-structure distribution and mechanical properties of 65Mn、42Cr Mo wheels in different induction hardening processes; analyze the impacts of different process on structure property of same material, simultaneously, do the analysis on quenching results by testing the hardness distribution, depth of hardening layer and using metallurgical structure analysis method; compare the influences of same quenching process on the main part of rim, angle R and tread; analyze the forming reasons of hardening crack, make comprehensive consideration of quenching processes at last.