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The influence of solid-solution temperature on the dissolution of carbide precipitates,the average grain size and the microhardness of the austenite matrix in an Fe-Ni based high strength low thermal expansion (HSLTE) alloy was investigated to obtain the proper temperature range of the solid-solution process.The XRD analysis,microstructure observations,and the theoretical calculations showed that the Mo-rich M2C-type precipitates in the Fe-Ni based HSLTE alloy dissolve completely at about 1100 ℃.The average grain size of the studied alloys increases from 14 to 46 μm in the temperature range of 1050 to 1200 ℃.The microhardness of the matrix decreases first for the sake of solid-solution treatment,but then increases later with increasing solution temperature because of the solution strengthening effect.