42results about How to "Good heat treatment performance" patented technology

The invention provides an inner conical elastomer for a strain force transducer. The inner conical elastomer comprises a cylindrical base body; the upper part of the base body is provided with a conical concave part; the bottom of the conical concave part is provided with a central hole; and the conical surface of the conical concave part is provided with a strain gauge. The optimization method for the elastomer comprises the following steps of: estimating an initial size; calculating stress of the elastomer under the action of the axial force of a bolt by a finite element method, and adjusting the cone angle of a model until stress on the inner conical surface is distributed uniformly; adjusting the thickness of the base body under the condition of not changing the cone angle to ensure that the stress level on the conical surface meets the requirement; and rounding the model size obtained through finite element calculation, wherein the rounded model size is used as the final size of the elastomer. The inner conical elastomer is a simple revolution solid, and is high in processing and heat treatment manufacturability; the stress of the adhesion part of the strain gauge is distributed uniformly; and the accuracy of the adhesion position of the strain gauge is not required. The axial size of the elastomer is smaller than that of a spoke elastomer, and the elastomer is more suitable for measuring the axial force of the bolt.

The invention discloses Co-free composite reinforced secondary hardening ultrahigh-strength steel and a preparing method and belongs to the technical field of alloy steel. The Co-free composite reinforced secondary hardening ultrahigh-strength steel comprises, by weight, 0.20-0.50% of C, 1.0-5.0% of Cr, 10.0-30.0% of Ni, 0.50-3.0% of Al, 1.0-5.0% of Mo, 2.0% of W or less, 0.30% of V or less, 0.20% of Nb or less, and the balance Fe and unavoidable impurities. The vacuum induction technology, the vacuum arc remelting or vacuum induction technology and the electroslag remelting technology can be adopted in the alloy. Compared with the prior art, the Co-free composite reinforced secondary hardening ultrahigh-strength steel has the beneficial effects that the comprehensive performance is good, ultrahigh strength and good ductility and toughness are achieved, the heat treatment technology is superior in performance, high temper resistance and overaging resisting capability are achieved, the content of the strategic resource of the Co element is saved, and the economical efficiency is improved.

The invention relates to a high-performance heat-resistant cast magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 5-8% of Zn, 1.5% of Si, 3% of Sn, 0.5% of Sr, 0.5% of Bi and the balance of Mg. The method comprises the following steps: preparing raw materials according to the mass percent; smelting Mg with an iron crucible in a crucible resistance furnace until the Mg is molten, adding Zn, Si, Sn, Sr and Bi, smelting at 720-750 DEG C by using an N2-SF6 gas mixture as a protective gas, and casting the obtained liquid metal at 730 DEG C; and carrying out solid solution on the obtained cast ingot at 350 DEG C for 24 hours, heating to 450 DEG C, carrying out solid solution for 12 hours, and aging the cast ingot at 200 DEG C for 36-60 hours. The room-temperature tensile strength of the obtained high-performance heat-resistant cast magnesium alloy is greater than or equal to 320 MPa, and the percentage of elongation is greater than or equal to 6%. The tensile strength at 200 DEG C is greater than or equal to 220 MPa, and the percentage of elongation is greater than or equal to 9%. The high-performance heat-resistant cast magnesium alloy has favorable comprehensive mechanical properties, and can be widely used in commercial parts, including automobile parts, electronic product components and components for aviation and aerospace.